/* work.c

   Copyright (c) 2003-2015 HandBrake Team
   This file is part of the HandBrake source code
   Homepage: <http://handbrake.fr/>.
   It may be used under the terms of the GNU General Public License v2.
   For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
 */

#include "hb.h"
#include "libavformat/avformat.h"
#include "openclwrapper.h"
#include "opencl.h"

#ifdef USE_QSV
#include "qsv_common.h"
#include "qsv_filter_pp.h"
#endif

typedef struct
{
    hb_list_t * jobs;
    hb_job_t  ** current_job;
    hb_error_code * error;
    volatile int * die;

} hb_work_t;

static void work_func();
static void do_job( hb_job_t *);
static void work_loop( void * );
static void filter_loop( void * );

#define FIFO_UNBOUNDED 65536
#define FIFO_UNBOUNDED_WAKE 65535
#define FIFO_LARGE 32
#define FIFO_LARGE_WAKE 16
#define FIFO_SMALL 16
#define FIFO_SMALL_WAKE 15
#define FIFO_MINI 4
#define FIFO_MINI_WAKE 3

/**
 * Allocates work object and launches work thread with work_func.
 * @param jobs Handle to hb_list_t.
 * @param die Handle to user inititated exit indicator.
 * @param error Handle to error indicator.
 */
hb_thread_t * hb_work_init( hb_list_t * jobs, volatile int * die, hb_error_code * error, hb_job_t ** job )
{
    hb_work_t * work = calloc( sizeof( hb_work_t ), 1 );

    work->jobs      = jobs;
    work->current_job = job;
    work->die       = die;
    work->error     = error;

    return hb_thread_init( "work", work_func, work, HB_LOW_PRIORITY );
}

static void InitWorkState(hb_handle_t *h, int pass_id, int pass, int pass_count)
{
    hb_state_t state;

    state.state  = HB_STATE_WORKING;
#define p state.param.working
    p.pass_id    = pass_id;
    p.pass       = pass;
    p.pass_count = pass_count;
    p.progress   = 0.0;
    p.rate_cur   = 0.0;
    p.rate_avg   = 0.0;
    p.hours      = -1;
    p.minutes    = -1;
    p.seconds    = -1; 
#undef p

    hb_set_state( h, &state );

}

/**
 * Iterates through job list and calls do_job for each job.
 * @param _work Handle work object.
 */
static void work_func( void * _work )
{
    hb_work_t  * work = _work;
    hb_job_t   * job;

    hb_log( "%d job(s) to process", hb_list_count( work->jobs ) );

    while( !*work->die && ( job = hb_list_item( work->jobs, 0 ) ) )
    {
        hb_list_rem( work->jobs, job );
        hb_list_t * passes = hb_list_init();

        // JSON jobs get special treatment.  We want to perform the title
        // scan for the JSON job automatically.  This requires that we delay
        // filling the job struct till we have performed the title scan
        // because the default values for the job come from the title.
        if (job->json != NULL)
        {
            hb_deep_log(1, "json job:\n%s", job->json);

            // Perform title scan for json job
            hb_json_job_scan(job->h, job->json);

            // Expand json string to full job struct
            hb_job_t *new_job = hb_json_to_job(job->h, job->json);
            if (new_job == NULL)
            {
                hb_job_close(&job);
                hb_list_close(&passes);
                *work->error = HB_ERROR_INIT;
                *work->die = 1;
                break;
            }
            new_job->h = job->h;
            hb_job_close(&job);
            job = new_job;
        }
        hb_job_setup_passes(job->h, job, passes);
        hb_job_close(&job);

        int pass_count, pass;
        pass_count = hb_list_count(passes);
        for (pass = 0; pass < pass_count && !*work->die; pass++)
        {
            job = hb_list_item(passes, pass);
            job->die = work->die;
            job->done_error = work->error;
            *(work->current_job) = job;
            InitWorkState(job->h, job->pass_id, pass + 1, pass_count);
            do_job( job );
            *(work->current_job) = NULL;
        }
        // Clean up any incomplete jobs
        for (; pass < pass_count; pass++)
        {
            job = hb_list_item(passes, pass);
            hb_job_close(&job);
        }
        hb_list_close(&passes);
    }

    free( work );
}

hb_work_object_t * hb_get_work( hb_handle_t *h, int id )
{
    hb_work_object_t * w;
    for( w = hb_objects; w; w = w->next )
    {
        if( w->id == id )
        {
            hb_work_object_t *wc = malloc( sizeof(*w) );
            *wc = *w;
            wc->h = h;
            return wc;
        }
    }
    return NULL;
}

hb_work_object_t* hb_codec_decoder(hb_handle_t *h, int codec)
{
    hb_work_object_t * w = NULL;
    if (codec & HB_ACODEC_FF_MASK)
    {
        w = hb_get_work(h, WORK_DECAVCODEC);
        w->yield = 1;   // decoders yield to keep sync fifos more even
    }
    switch (codec)
    {
        case HB_ACODEC_LPCM:
            w = hb_get_work(h, WORK_DECLPCM);
            w->yield = 1;   // decoders yield to keep sync fifos more even
            break;
        default:
            break;
    }
    return w;
}

hb_work_object_t* hb_codec_encoder(hb_handle_t *h, int codec)
{
    if (codec & HB_ACODEC_FF_MASK)
    {
        return hb_get_work(h, WORK_ENCAVCODEC_AUDIO);
    }
    switch (codec)
    {
        case HB_ACODEC_AC3:     return hb_get_work(h, WORK_ENCAVCODEC_AUDIO);
        case HB_ACODEC_LAME:    return hb_get_work(h, WORK_ENCLAME);
        case HB_ACODEC_VORBIS:  return hb_get_work(h, WORK_ENCVORBIS);
        case HB_ACODEC_CA_AAC:  return hb_get_work(h, WORK_ENC_CA_AAC);
        case HB_ACODEC_CA_HAAC: return hb_get_work(h, WORK_ENC_CA_HAAC);
        default:                break;
    }
    return NULL;
}

/**
 * Displays job parameters in the debug log.
 * @param job Handle work hb_job_t.
 */
void hb_display_job_info(hb_job_t *job)
{
    int i;
    hb_title_t *title = job->title;
    hb_audio_t *audio;
    hb_subtitle_t *subtitle;
    
    hb_log("job configuration:");
    hb_log( " * source");
    
    hb_log( "   + %s", title->path );

    if( job->pts_to_start || job->pts_to_stop )
    {
        int64_t stop;
        int hr_start, min_start, hr_stop, min_stop;
        float sec_start, sec_stop;

        stop = job->pts_to_start + job->pts_to_stop;

        hr_start = job->pts_to_start / (90000 * 60 * 60);
        min_start = job->pts_to_start / (90000 * 60);
        sec_start = (float)job->pts_to_start / 90000.0 - min_start * 60;
        min_start %= 60;

        hr_stop = stop / (90000 * 60 * 60);
        min_stop = stop / (90000 * 60);
        sec_stop = (float)stop / 90000.0 - min_stop * 60;
        min_stop %= 60;

        if (job->pts_to_stop)
        {
            hb_log("   + title %d, start %02d:%02d:%02.2f stop %02d:%02d:%02.2f",
                   title->index,
                   hr_start, min_start, sec_start,
                   hr_stop,  min_stop,  sec_stop);
        }
        else
        {
            hb_log("   + title %d, start %02d:%02d:%02.2f",
                   title->index,
                   hr_start, min_start, sec_start);
        }
    }
    else if( job->frame_to_start || job->frame_to_stop )
    {
        hb_log( "   + title %d, frames %d to %d", title->index,
                job->frame_to_start, job->frame_to_start + job->frame_to_stop );
    }
    else
    {
        hb_log( "   + title %d, chapter(s) %d to %d", title->index,
                job->chapter_start, job->chapter_end );
    }

    if( title->container_name != NULL )
        hb_log( "   + container: %s", title->container_name);

    if( title->data_rate )
    {
        hb_log( "   + data rate: %d kbps", title->data_rate / 1000 );
    }
    
    hb_log( " * destination");

    hb_log( "   + %s", job->file );

    hb_log("   + container: %s", hb_container_get_long_name(job->mux));
    switch (job->mux)
    {
        case HB_MUX_AV_MP4:
            if (job->mp4_optimize)
                hb_log("     + optimized for HTTP streaming (fast start)");
            if (job->ipod_atom)
                hb_log("     + compatibility atom for iPod 5G");
            break;

        default:
            break;
    }

    if( job->chapter_markers )
    {
        hb_log( "     + chapter markers" );
    }
    
    hb_log(" * video track");
    
#ifdef USE_QSV
    if (hb_qsv_decode_is_enabled(job))
    {
        hb_log("   + decoder: %s",
               hb_qsv_decode_get_codec_name(title->video_codec_param));
    }
    else
#endif
#ifdef USE_HWD
    if (hb_hwd_enabled(job->h))
    {
        hb_log("   + decoder: %s (dxva2)", title->video_codec_name);
    }
    else
#endif
    {
        hb_log("   + decoder: %s", title->video_codec_name);
    }

    if( title->video_bitrate )
    {
        hb_log( "     + bitrate %d kbps", title->video_bitrate / 1000 );
    }
    
    // Filters can modify dimensions.  So show them first.
    if( hb_list_count( job->list_filter ) )
    {
        hb_log("   + %s", hb_list_count( job->list_filter) > 1 ? "filters" : "filter" );
        for( i = 0; i < hb_list_count( job->list_filter ); i++ )
        {
            hb_filter_object_t * filter = hb_list_item( job->list_filter, i );
            if( filter->settings && *filter->settings )
                hb_log("     + %s (%s)", filter->name, filter->settings);
            else
                hb_log("     + %s (default settings)", filter->name);
            if( filter->info )
            {
                hb_filter_info_t info;
                filter->info( filter, &info );
                if( info.human_readable_desc[0] )
                {
                    hb_log("       + %s", info.human_readable_desc);
                }
            }
        }
    }
    
    if ( job->grayscale )
        hb_log( "     + grayscale mode" );

    hb_log( "   + Output geometry" );
    hb_log( "     + storage dimensions: %d x %d", job->width, job->height );
    hb_log( "     + pixel aspect ratio: %d : %d", job->par.num, job->par.den );
    hb_log( "     + display dimensions: %d x %d",
            job->width * job->par.num / job->par.den, job->height );


    if( !job->indepth_scan )
    {
        /* Video encoder */
        hb_log("   + encoder: %s",
               hb_video_encoder_get_long_name(job->vcodec));

        if (job->encoder_preset && *job->encoder_preset)
        {
            switch (job->vcodec)
            {
                case HB_VCODEC_X264:
                case HB_VCODEC_X265:
                case HB_VCODEC_QSV_H264:
                case HB_VCODEC_QSV_H265:
                    hb_log("     + preset:  %s", job->encoder_preset);
                default:
                    break;
            }
        }
        if (job->encoder_tune && *job->encoder_tune)
        {
            switch (job->vcodec)
            {
                case HB_VCODEC_X264:
                case HB_VCODEC_X265:
                    hb_log("     + tune:    %s", job->encoder_tune);
                default:
                    break;
            }
        }
        if (job->encoder_options != NULL && *job->encoder_options &&
            job->vcodec != HB_VCODEC_THEORA)
        {
            hb_log("     + options: %s", job->encoder_options);
        }
        if (job->encoder_profile && *job->encoder_profile)
        {
            switch (job->vcodec)
            {
                case HB_VCODEC_X264:
                case HB_VCODEC_X265:
                case HB_VCODEC_QSV_H264:
                case HB_VCODEC_QSV_H265:
                    hb_log("     + profile: %s", job->encoder_profile);
                default:
                    break;
            }
        }
        if (job->encoder_level && *job->encoder_level)
        {
            switch (job->vcodec)
            {
                case HB_VCODEC_X264:
                case HB_VCODEC_QSV_H264:
                case HB_VCODEC_QSV_H265:
                    hb_log("     + level:   %s", job->encoder_level);
                default:
                    break;
            }
        }

        if (job->vquality >= 0)
        {
            hb_log("     + quality: %.2f (%s)", job->vquality,
                   hb_video_quality_get_name(job->vcodec));
        }
        else
        {
            hb_log( "     + bitrate: %d kbps, pass: %d", job->vbitrate, job->pass_id );
            if(job->pass_id == HB_PASS_ENCODE_1ST && job->fastfirstpass == 1 &&
               (job->vcodec == HB_VCODEC_X264 || job->vcodec == HB_VCODEC_X265))
            {
                hb_log( "     + fast first pass" );
                if (job->vcodec == HB_VCODEC_X264)
                {
                    hb_log( "     + options: ref=1:8x8dct=0:me=dia:trellis=0" );
                    hb_log( "                analyse=i4x4 (if originally enabled, else analyse=none)" );
                    hb_log( "                subq=2 (if originally greater than 2, else subq unchanged)" );
                }
            }
        }

        if (job->color_matrix_code && job->vcodec == HB_VCODEC_X264)
        {
            // color matrix is set:
            // 1) at the stream    level (x264  only),
            // 2) at the container level (mp4v2 only)
            hb_log("     + custom color matrix: %s",
                   job->color_matrix_code == 1 ? "ITU Bt.601 (NTSC)" :
                   job->color_matrix_code == 2 ? "ITU Bt.601 (PAL)"  :
                   job->color_matrix_code == 3 ? "ITU Bt.709 (HD)"   : "Custom");
        }
    }

    if( job->indepth_scan )
    {
        hb_log( " * Foreign Audio Search: %s%s%s",
                job->select_subtitle_config.dest == RENDERSUB ? "Render/Burn-in" : "Passthrough",
                job->select_subtitle_config.force ? ", Forced Only" : "",
                job->select_subtitle_config.default_track ? ", Default" : "" );
    }

    for( i = 0; i < hb_list_count( job->list_subtitle ); i++ )
    {
        subtitle = hb_list_item( job->list_subtitle, i );

        if( subtitle )
        {
            if( job->indepth_scan )
            {
                hb_log( "   + subtitle, %s (track %d, id 0x%x) %s [%s]",
                        subtitle->lang, subtitle->track, subtitle->id,
                        subtitle->format == PICTURESUB ? "Picture" : "Text",
                        hb_subsource_name( subtitle->source ) );
            }
            else if( subtitle->source == SRTSUB )
            {
                /* For SRT, print offset and charset too */
                hb_log( " * subtitle track %d, %s (track %d, id 0x%x) Text [SRT] -> %s%s, offset: %"PRId64", charset: %s",
                        subtitle->out_track, subtitle->lang, subtitle->track, subtitle->id,
                        subtitle->config.dest == RENDERSUB ? "Render/Burn-in" : "Passthrough",
                        subtitle->config.default_track ? ", Default" : "",
                        subtitle->config.offset, subtitle->config.src_codeset );
            }
            else
            {
                hb_log( " * subtitle track %d, %s (track %d, id 0x%x) %s [%s] -> %s%s%s",
                        subtitle->out_track, subtitle->lang, subtitle->track, subtitle->id,
                        subtitle->format == PICTURESUB ? "Picture" : "Text",
                        hb_subsource_name( subtitle->source ),
                        subtitle->config.dest == RENDERSUB ? "Render/Burn-in" : "Passthrough",
                        subtitle->config.force ? ", Forced Only" : "",
                        subtitle->config.default_track ? ", Default" : "" );
            }
        }
    }

    if( !job->indepth_scan )
    {
        for( i = 0; i < hb_list_count( job->list_audio ); i++ )
        {
            audio = hb_list_item( job->list_audio, i );

            hb_log( " * audio track %d", audio->config.out.track );
            
            if( audio->config.out.name )
                hb_log( "   + name: %s", audio->config.out.name );

            hb_log( "   + decoder: %s (track %d, id 0x%x)", audio->config.lang.description, audio->config.in.track + 1, audio->id );

            if (audio->config.in.bitrate >= 1000)
                hb_log("     + bitrate: %d kbps, samplerate: %d Hz",
                       audio->config.in.bitrate / 1000,
                       audio->config.in.samplerate);
            else
                hb_log("     + samplerate: %d Hz",
                       audio->config.in.samplerate);

            if( audio->config.out.codec & HB_ACODEC_PASS_FLAG )
            {
                hb_log("   + %s",
                       hb_audio_encoder_get_name(audio->config.out.codec));
            }
            else
            {
                hb_log("   + mixdown: %s",
                       hb_mixdown_get_name(audio->config.out.mixdown));
                if( audio->config.out.normalize_mix_level != 0 )
                {
                    hb_log( "   + normalized mixing levels" );
                }
                if( audio->config.out.gain != 0.0 )
                {
                    hb_log( "   + gain: %.fdB", audio->config.out.gain );
                }
                if (audio->config.out.dynamic_range_compression > 0.0f &&
                    hb_audio_can_apply_drc(audio->config.in.codec,
                                           audio->config.in.codec_param,
                                           audio->config.out.codec))
                {
                    hb_log( "   + dynamic range compression: %f", audio->config.out.dynamic_range_compression );
                }
                if (hb_audio_dither_is_supported(audio->config.out.codec))
                {
                    hb_log("   + dither: %s",
                           hb_audio_dither_get_description(audio->config.out.dither_method));
                }
                hb_log("   + encoder: %s",
                       hb_audio_encoder_get_long_name(audio->config.out.codec));
                if (audio->config.out.bitrate > 0)
                {
                    hb_log("     + bitrate: %d kbps, samplerate: %d Hz",
                           audio->config.out.bitrate, audio->config.out.samplerate);
                }
                else if (audio->config.out.quality != HB_INVALID_AUDIO_QUALITY)
                {
                    hb_log("     + quality: %.2f, samplerate: %d Hz",
                           audio->config.out.quality, audio->config.out.samplerate);
                }
                else if (audio->config.out.samplerate > 0)
                {
                    hb_log("     + samplerate: %d Hz",
                           audio->config.out.samplerate);
                }
                if (audio->config.out.compression_level >= 0)
                {
                    hb_log("     + compression level: %.2f",
                           audio->config.out.compression_level);
                }
            }
        }
    }
}

/* Corrects framerates when actual duration and frame count numbers are known. */
void correct_framerate( hb_job_t * job )
{
    hb_interjob_t * interjob = hb_interjob_get( job->h );

    if( ( job->sequence_id & 0xFFFFFF ) != ( interjob->last_job & 0xFFFFFF) )
        return; // Interjob information is for a different encode.

    // compute actual output vrate from first pass
    interjob->vrate.den = (int64_t)job->vrate.num * interjob->total_time /
                          ((int64_t)interjob->out_frame_count * 90000);
    interjob->vrate.num = job->vrate.num;
}

/**
 * Job initialization rountine.
 * Initializes fifos.
 * Creates work objects for synchronizer, video decoder, video renderer, video decoder, audio decoder, audio encoder, reader, muxer.
 * Launches thread for each work object with work_loop.
 * Loops while monitoring status of work threads and fifos.
 * Exits loop when conversion is done and fifos are empty.
 * Closes threads and frees fifos.
 * @param job Handle work hb_job_t.
 */
static void do_job(hb_job_t *job)
{
    int i;
    hb_title_t *title;
    hb_interjob_t *interjob;
    hb_work_object_t *w;
    hb_work_object_t *sync;
    hb_work_object_t *muxer;
    hb_work_object_t *reader = hb_get_work(job->h, WORK_READER);

    hb_audio_t *audio;
    hb_subtitle_t *subtitle;
    unsigned int subtitle_highest     = 0;
    unsigned int subtitle_lowest      = 0;
    unsigned int subtitle_lowest_id   = 0;
    unsigned int subtitle_forced_id   = 0;
    unsigned int subtitle_forced_hits = 0;
    unsigned int subtitle_hit         = 0;

    title = job->title;
    interjob = hb_interjob_get( job->h );

    if( job->pass_id == HB_PASS_ENCODE_2ND )
    {
        correct_framerate( job );
    }

    job->list_work = hb_list_init();

    /*
     * OpenCL
     *
     * Note: we delay hb_ocl_init until here, since they're no point it loading
     * the library if we aren't going to use it. But we only call hb_ocl_close
     * in hb_global_close, since un/reloading the library each run is wasteful.
     */
    if (job->use_opencl)
    {
        if (hb_ocl_init() || hb_init_opencl_run_env(0, NULL, "-I."))
        {
            hb_log("work: failed to initialize OpenCL environment, using fallback");
            hb_release_opencl_run_env();
            job->use_opencl = 0;
        }
    }
    else
    {
        // we're not (re-)using OpenCL here, we can release the environment
        hb_release_opencl_run_env();
    }

    hb_log( "starting job" );

    /* Look for the scanned subtitle in the existing subtitle list
     * select_subtitle implies that we did a scan. */
    if( !job->indepth_scan && interjob->select_subtitle )
    {
        /* Disable forced subtitles if we didn't find any in the scan, so that
         * we display normal subtitles instead. */
        if( interjob->select_subtitle->config.force &&
            interjob->select_subtitle->forced_hits == 0 )
        {
            interjob->select_subtitle->config.force = 0;
        }
        for( i = 0; i < hb_list_count( job->list_subtitle ); )
        {
            subtitle = hb_list_item( job->list_subtitle, i );
            if( subtitle )
            {
                /* Remove the scanned subtitle from the list if
                 * it would result in:
                 * - an emty track (forced and no forced hits)
                 * - an identical, duplicate subtitle track:
                 *   -> both (or neither) are forced 
                 *   -> subtitle is not forced but all its hits are forced */
                if( ( interjob->select_subtitle->id == subtitle->id ) &&
                    ( ( subtitle->config.force &&
                        interjob->select_subtitle->forced_hits == 0 ) ||
                      ( subtitle->config.force == interjob->select_subtitle->config.force ) ||
                      ( !subtitle->config.force &&
                        interjob->select_subtitle->hits == interjob->select_subtitle->forced_hits ) ) )
                {
                    hb_list_rem( job->list_subtitle, subtitle );
                    free( subtitle );
                    continue;
                }
                /* Adjust output track number, in case we removed one.
                 * Output tracks sadly still need to be in sequential order.
                 * Note: out.track starts at 1, i starts at 0, and track 1 is interjob->select_subtitle */
                subtitle->out_track = ++i + 1;
            }
            else
            {
                // avoid infinite loop is subtitle == NULL
                i++;
            }
        }

        /* Add the subtitle that we found on the subtitle scan pass.
         *
         * Make sure it's the first subtitle in the list so that it becomes the
         * first burned subtitle (explicitly or after sanitizing) - which should
         * ensure that it doesn't get dropped. */
        interjob->select_subtitle->out_track = 1;
        if (job->pass_id == HB_PASS_ENCODE ||
            job->pass_id == HB_PASS_ENCODE_2ND)
        {
            // final pass, interjob->select_subtitle is no longer needed
            hb_list_insert(job->list_subtitle, 0, interjob->select_subtitle);
            interjob->select_subtitle = NULL;
        }
        else
        {
            // this is not the final pass, so we need to copy it instead
            hb_list_insert(job->list_subtitle, 0, hb_subtitle_copy(interjob->select_subtitle));
        }
    }

    if ( !job->indepth_scan )
    {
        // Sanitize subtitles
        uint8_t one_burned = 0;
        for( i = 0; i < hb_list_count( job->list_subtitle ); )
        {
            subtitle = hb_list_item( job->list_subtitle, i );
            if ( subtitle->config.dest == RENDERSUB )
            {
                if ( one_burned )
                {
                    if ( !hb_subtitle_can_pass(subtitle->source, job->mux) )
                    {
                        hb_log( "More than one subtitle burn-in requested, dropping track %d.", i );
                        hb_list_rem( job->list_subtitle, subtitle );
                        free( subtitle );
                        continue;
                    }
                    else
                    {
                        hb_log( "More than one subtitle burn-in requested.  Changing track %d to soft subtitle.", i );
                        subtitle->config.dest = PASSTHRUSUB;
                    }
                }
                else if ( !hb_subtitle_can_burn(subtitle->source) )
                {
                    hb_log( "Subtitle burn-in requested and input track can not be rendered.  Changing track %d to soft subtitle.", i );
                    subtitle->config.dest = PASSTHRUSUB;
                }
                else
                {
                    one_burned = 1;
                }
            }

            if ( subtitle->config.dest == PASSTHRUSUB &&
                 !hb_subtitle_can_pass(subtitle->source, job->mux) )
            {
                if ( !one_burned )
                {
                    hb_log( "Subtitle pass-thru requested and input track is not compatible with container.  Changing track %d to burned-in subtitle.", i );
                    subtitle->config.dest = RENDERSUB;
                    subtitle->config.default_track = 0;
                    one_burned = 1;
                }
                else
                {
                    hb_log( "Subtitle pass-thru requested and input track is not compatible with container.  One track already burned, dropping track %d.", i );
                    hb_list_rem( job->list_subtitle, subtitle );
                    free( subtitle );
                    continue;
                }
            }
            /* Adjust output track number, in case we removed one.
             * Output tracks sadly still need to be in sequential order.
             * Note: out.track starts at 1, i starts at 0 */
            subtitle->out_track = ++i;
        }
        if (one_burned)
        {
            // Add subtitle rendering filter
            // Note that if the filter is already in the filter chain, this
            // has no effect. Note also that this means the front-end is
            // not required to add the subtitle rendering filter since
            // we will always try to do it here.
            hb_filter_object_t *filter = hb_filter_init(HB_FILTER_RENDER_SUB);
            hb_add_filter(job, filter, NULL);
        }
    }

#ifdef USE_QSV
    /*
     * XXX: mfxCoreInterface's CopyFrame doesn't work in old drivers, and our
     *      workaround is really slow. If we have validated CPU-based filters in
     *      the list and we can't use CopyFrame, disable QSV decoding until a
     *      better solution is implemented.
     */
    if (hb_qsv_copyframe_is_slow(job->vcodec))
    {
        if (job->list_filter != NULL)
        {
            int encode_only = 0;
            for (i = 0; i < hb_list_count(job->list_filter) && !encode_only; i++)
            {
                hb_filter_object_t *filter = hb_list_item(job->list_filter, i);
                switch (filter->id)
                {
                    // validated, CPU-based filters
                    case HB_FILTER_ROTATE:
                    case HB_FILTER_RENDER_SUB:
                        encode_only = 1;
                        break;

                    // CPU-based deinterlace (validated)
                    case HB_FILTER_DEINTERLACE:
                        if (filter->settings != NULL &&
                            strcasecmp(filter->settings, "qsv") != 0)
                        {
                            encode_only = 1;
                        }
                        break;

                    // other filters will be removed
                    default:
                        break;
                }
            }
            if (encode_only)
            {
                hb_log("do_job: QSV: possible CopyFrame bug, using encode-only path");
                if (hb_get_cpu_platform() >= HB_CPU_PLATFORM_INTEL_IVB)
                {
                    hb_log("do_job: QSV: please update your Intel graphics driver to version 9.18.10.3257 or later");
                }
                job->qsv.decode = 0;
            }
        }
    }

    /*
     * When QSV is used for decoding, not all CPU-based filters are supported,
     * so we need to do a little extra setup here.
     */
    if (hb_qsv_decode_is_enabled(job))
    {
        int vpp_settings[7];
        int num_cpu_filters = 0;
        hb_filter_object_t *filter;
        // default values for VPP filter
        vpp_settings[0] = job->title->geometry.width;
        vpp_settings[1] = job->title->geometry.height;
        vpp_settings[2] = job->title->crop[0];
        vpp_settings[3] = job->title->crop[1];
        vpp_settings[4] = job->title->crop[2];
        vpp_settings[5] = job->title->crop[3];
        vpp_settings[6] = 0; // deinterlace: off
        if (job->list_filter != NULL && hb_list_count(job->list_filter) > 0)
        {
            while (hb_list_count(job->list_filter) > num_cpu_filters)
            {
                filter = hb_list_item(job->list_filter, num_cpu_filters);
                switch (filter->id)
                {
                    // cropping and scaling always done via VPP filter
                    case HB_FILTER_CROP_SCALE:
                        if (filter->settings == NULL || *filter->settings == '\0')
                        {
                            // VPP defaults were set above, so not a problem
                            // however, this should never happen, print an error
                            hb_error("do_job: '%s': no settings!", filter->name);
                        }
                        else
                        {
                            sscanf(filter->settings, "%d:%d:%d:%d:%d:%d",
                                   &vpp_settings[0], &vpp_settings[1],
                                   &vpp_settings[2], &vpp_settings[3],
                                   &vpp_settings[4], &vpp_settings[5]);
                        }
                        // VPP crop/scale takes precedence over OpenCL scale too
                        if (job->use_opencl)
                        {
                            hb_release_opencl_run_env();
                            job->use_opencl = 0;
                        }
                        hb_list_rem(job->list_filter, filter);
                        hb_filter_close(&filter);
                        break;

                    // pick VPP or CPU deinterlace depending on settings
                    case HB_FILTER_DEINTERLACE:
                        if (filter->settings == NULL ||
                            strcasecmp(filter->settings, "qsv") == 0)
                        {
                            // deinterlacing via VPP filter
                            vpp_settings[6] = 1;
                            hb_list_rem(job->list_filter, filter);
                            hb_filter_close(&filter);
                        }
                        else
                        {
                            // validated
                            num_cpu_filters++;
                        }
                        break;

                    // then, validated filters
                    case HB_FILTER_ROTATE: // TODO: use Media SDK for this
                    case HB_FILTER_RENDER_SUB:
                        num_cpu_filters++;
                        break;

                    // finally, drop all unsupported filters
                    default:
                        hb_log("do_job: QSV: full path, removing unsupported filter '%s'",
                               filter->name);
                        hb_list_rem(job->list_filter, filter);
                        hb_filter_close(&filter);
                        break;
                }
            }
            if (num_cpu_filters > 0)
            {
                // we need filters to copy to system memory and back
                filter = hb_filter_init(HB_FILTER_QSV_PRE);
                hb_add_filter(job, filter, NULL);
                filter = hb_filter_init(HB_FILTER_QSV_POST);
                hb_add_filter(job, filter, NULL);
            }
            if (vpp_settings[0] != job->title->geometry.width  ||
                vpp_settings[1] != job->title->geometry.height ||
                vpp_settings[2] >= 1 /* crop */       ||
                vpp_settings[3] >= 1 /* crop */       ||
                vpp_settings[4] >= 1 /* crop */       ||
                vpp_settings[5] >= 1 /* crop */       ||
                vpp_settings[6] >= 1 /* deinterlace */)
            {
                // we need the VPP filter
                char *settings = hb_strdup_printf("%d:%d:%d:%d:%d:%d_dei:%d",
                                                  vpp_settings[0],
                                                  vpp_settings[1],
                                                  vpp_settings[2],
                                                  vpp_settings[3],
                                                  vpp_settings[4],
                                                  vpp_settings[5],
                                                  vpp_settings[6]);
                filter = hb_filter_init(HB_FILTER_QSV);
                hb_add_filter(job, filter, settings);
                free(settings);
            }
        }
    }
#endif

#ifdef USE_HWD
    /*
     * Check support for and enable DXVA2-accelerated when applicable; we need:
     * - a compatible input bitstream (HB_DECODE_SUPPORT_DXVA2)
     * - DXVA2-accelerated decoding enabled (job->use_hwd)
     * - an AVFormatContext (title->opaque_priv) for now
     */
    if (title->video_decode_support & HB_DECODE_SUPPORT_DXVA2)
    {
        hb_hwd_set_enable(job->h, job->use_hwd && title->opaque_priv != NULL);
    }
    else
#endif
    {
        hb_hwd_set_enable(job->h, 0);
    }

    // Filters have an effect on settings.
    // So initialize the filters and update the job.
    if( job->list_filter && hb_list_count( job->list_filter ) )
    {
        hb_filter_init_t init;

        init.job = job;
        init.pix_fmt = AV_PIX_FMT_YUV420P;
        init.geometry.width = title->geometry.width;
        init.geometry.height = title->geometry.height;

        init.geometry.par = job->par;
        memcpy(init.crop, title->crop, sizeof(int[4]));
        init.vrate = title->vrate;
        init.cfr = 0;
        for( i = 0; i < hb_list_count( job->list_filter ); )
        {
            hb_filter_object_t * filter = hb_list_item( job->list_filter, i );
            if( filter->init( filter, &init ) )
            {
                hb_log( "Failure to initialise filter '%s', disabling",
                        filter->name );
                hb_list_rem( job->list_filter, filter );
                hb_filter_close( &filter );
                continue;
            }
            i++;
        }
        job->width = init.geometry.width;
        job->height = init.geometry.height;
        job->par = init.geometry.par;
        memcpy(job->crop, init.crop, sizeof(int[4]));
        job->vrate = init.vrate;
        job->cfr = init.cfr;

        // Perform filter post_init which informs filters of final
        // job configuration. e.g. rendersub filter needs to know the
        // final crop dimensions.
        for( i = 0; i < hb_list_count( job->list_filter ); )
        {
            hb_filter_object_t * filter = hb_list_item( job->list_filter, i );
            if (filter->post_init != NULL && filter->post_init(filter, job))
            {
                hb_log( "Failure to initialise filter '%s', disabling",
                        filter->name );
                hb_list_rem( job->list_filter, filter );
                hb_filter_close( &filter );
                continue;
            }
            i++;
        }
    }
    else
    {
        job->width = title->geometry.width;
        job->height = title->geometry.height;
        job->par = title->geometry.par;
        memset(job->crop, 0, sizeof(int[4]));
        job->vrate = title->vrate;
        job->cfr = 0;
    }

    /*
     * MPEG-4 Part 2 stores the PAR num/den as unsigned 8-bit fields,
     * and libavcodec's encoder fails to initialize if we don't handle it.
     */
    if (job->vcodec == HB_VCODEC_FFMPEG_MPEG4)
    {
        hb_limit_rational(&job->par.num, &job->par.den,
                           job->par.num,  job->par.den, 255);
    }

    /*
     * The frame rate may affect the bitstream's time base, lose superfluous
     * factors for consistency (some encoders reduce fractions, some don't).
     */
    hb_reduce(&job->vrate.num, &job->vrate.den,
               job->vrate.num,  job->vrate.den);

#ifdef USE_QSV
    if (hb_qsv_decode_is_enabled(job))
    {
        job->fifo_mpeg2  = hb_fifo_init( FIFO_MINI, FIFO_MINI_WAKE );
        job->fifo_raw    = hb_fifo_init( FIFO_MINI, FIFO_MINI_WAKE );
        job->fifo_sync   = hb_fifo_init( FIFO_MINI, FIFO_MINI_WAKE );
        job->fifo_render = hb_fifo_init( FIFO_MINI, FIFO_MINI_WAKE );
        job->fifo_mpeg4  = hb_fifo_init( FIFO_MINI, FIFO_MINI_WAKE );
    }
    else
#endif
    {
        job->fifo_mpeg2  = hb_fifo_init( FIFO_LARGE, FIFO_LARGE_WAKE );
        job->fifo_raw    = hb_fifo_init( FIFO_SMALL, FIFO_SMALL_WAKE );
        job->fifo_sync   = hb_fifo_init( FIFO_SMALL, FIFO_SMALL_WAKE );
        job->fifo_mpeg4  = hb_fifo_init( FIFO_LARGE, FIFO_LARGE_WAKE );
        job->fifo_render = NULL; // Attached to filter chain
    }

    /* Audio fifos must be initialized before sync */
    if (!job->indepth_scan)
    {
        // apply Auto Passthru settings
        hb_autopassthru_apply_settings(job);
        // sanitize audio settings
        for (i = 0; i < hb_list_count(job->list_audio);)
        {
            audio = hb_list_item(job->list_audio, i);
            if (audio->config.out.codec == HB_ACODEC_AUTO_PASS)
            {
                // Auto Passthru should have been handled above
                // remove track to avoid a crash
                hb_log("Auto Passthru error, dropping track %d",
                       audio->config.out.track);
                hb_list_rem(job->list_audio, audio);
                free(audio);
                continue;
            }
            if ((audio->config.out.codec & HB_ACODEC_PASS_FLAG) &&
                !(audio->config.in.codec &
                  audio->config.out.codec & HB_ACODEC_PASS_MASK))
            {
                hb_log("Passthru requested and input codec is not the same as output codec for track %d, dropping track",
                       audio->config.out.track);
                hb_list_rem(job->list_audio, audio);
                free(audio);
                continue;
            }
            /* Adjust output track number, in case we removed one.
             * Output tracks sadly still need to be in sequential order.
             * Note: out.track starts at 1, i starts at 0 */
            audio->config.out.track = ++i;
        }

        int best_mixdown    = 0;
        int best_bitrate    = 0;
        int best_samplerate = 0;

        for (i = 0; i < hb_list_count(job->list_audio); i++)
        {
            audio = hb_list_item(job->list_audio, i);

            /* set up the audio work structures */
            audio->priv.fifo_raw  = hb_fifo_init(FIFO_SMALL, FIFO_SMALL_WAKE);
            audio->priv.fifo_sync = hb_fifo_init(FIFO_SMALL, FIFO_SMALL_WAKE);
            audio->priv.fifo_out  = hb_fifo_init(FIFO_LARGE, FIFO_LARGE_WAKE);
            audio->priv.fifo_in   = hb_fifo_init(FIFO_LARGE, FIFO_LARGE_WAKE);

            /* Passthru audio */
            if (audio->config.out.codec & HB_ACODEC_PASS_FLAG)
            {
                // Muxer needs these to be set correctly in order to
                // set audio track MP4 time base.
                audio->config.out.samples_per_frame =
                                        audio->config.in.samples_per_frame;
                audio->config.out.samplerate = audio->config.in.samplerate;
                continue;
            }

            /* Vorbis language information */
            if (audio->config.out.codec == HB_ACODEC_VORBIS)
                audio->priv.config.vorbis.language = audio->config.lang.simple;

            /* sense-check the requested samplerate */
            if (audio->config.out.samplerate <= 0)
            {
                // if not specified, set to same as input
                audio->config.out.samplerate = audio->config.in.samplerate;
            }
            best_samplerate =
                hb_audio_samplerate_get_best(audio->config.out.codec,
                                             audio->config.out.samplerate,
                                             NULL);
            if (best_samplerate != audio->config.out.samplerate)
            {
                hb_log("work: sanitizing track %d unsupported samplerate %d Hz to %s kHz",
                       audio->config.out.track, audio->config.out.samplerate,
                       hb_audio_samplerate_get_name(best_samplerate));
                audio->config.out.samplerate = best_samplerate;
            }

            /* sense-check the requested mixdown */
            if (audio->config.out.mixdown <= HB_AMIXDOWN_NONE)
            {
                /* Mixdown not specified, set the default mixdown */
                audio->config.out.mixdown =
                    hb_mixdown_get_default(audio->config.out.codec,
                                           audio->config.in.channel_layout);
                hb_log("work: mixdown not specified, track %d setting mixdown %s",
                       audio->config.out.track,
                       hb_mixdown_get_name(audio->config.out.mixdown));
            }
            else
            {
                best_mixdown =
                    hb_mixdown_get_best(audio->config.out.codec,
                                        audio->config.in.channel_layout,
                                        audio->config.out.mixdown);
                if (audio->config.out.mixdown != best_mixdown)
                {
                    /* log the output mixdown */
                    hb_log("work: sanitizing track %d mixdown %s to %s",
                           audio->config.out.track,
                           hb_mixdown_get_name(audio->config.out.mixdown),
                           hb_mixdown_get_name(best_mixdown));
                    audio->config.out.mixdown = best_mixdown;
                }
            }

            /* sense-check the requested compression level */
            if (audio->config.out.compression_level < 0)
            {
                audio->config.out.compression_level =
                    hb_audio_compression_get_default(audio->config.out.codec);
                if (audio->config.out.compression_level >= 0)
                {
                    hb_log("work: compression level not specified, track %d setting compression level %.2f",
                           audio->config.out.track,
                           audio->config.out.compression_level);
                }
            }
            else
            {
                float best_compression =
                    hb_audio_compression_get_best(audio->config.out.codec,
                                                  audio->config.out.compression_level);
                if (best_compression != audio->config.out.compression_level)
                {
                    if (best_compression == -1)
                    {
                        hb_log("work: track %d, compression level not supported by codec",
                               audio->config.out.track);
                    }
                    else
                    {
                        hb_log("work: sanitizing track %d compression level %.2f to %.2f",
                               audio->config.out.track,
                               audio->config.out.compression_level,
                               best_compression);
                    }
                    audio->config.out.compression_level = best_compression;
                }
            }

            /* sense-check the requested quality */
            if (audio->config.out.quality != HB_INVALID_AUDIO_QUALITY)
            {
                float best_quality =
                    hb_audio_quality_get_best(audio->config.out.codec,
                                              audio->config.out.quality);
                if (best_quality != audio->config.out.quality)
                {
                    if (best_quality == HB_INVALID_AUDIO_QUALITY)
                    {
                        hb_log("work: track %d, quality mode not supported by codec",
                               audio->config.out.track);
                    }
                    else
                    {
                        hb_log("work: sanitizing track %d quality %.2f to %.2f",
                               audio->config.out.track,
                               audio->config.out.quality, best_quality);
                    }
                    audio->config.out.quality = best_quality;
                }
            }

            /* sense-check the requested bitrate */
            if (audio->config.out.quality == HB_INVALID_AUDIO_QUALITY)
            {
                if (audio->config.out.bitrate <= 0)
                {
                    /* Bitrate not specified, set the default bitrate */
                    audio->config.out.bitrate =
                        hb_audio_bitrate_get_default(audio->config.out.codec,
                                                     audio->config.out.samplerate,
                                                     audio->config.out.mixdown);
                    if (audio->config.out.bitrate > 0)
                    {
                        hb_log("work: bitrate not specified, track %d setting bitrate %d Kbps",
                               audio->config.out.track,
                               audio->config.out.bitrate);
                    }
                }
                else
                {
                    best_bitrate =
                        hb_audio_bitrate_get_best(audio->config.out.codec,
                                                  audio->config.out.bitrate,
                                                  audio->config.out.samplerate,
                                                  audio->config.out.mixdown);
                    if (best_bitrate > 0 &&
                        best_bitrate != audio->config.out.bitrate)
                    {
                        /* log the output bitrate */
                        hb_log("work: sanitizing track %d bitrate %d to %d Kbps",
                               audio->config.out.track,
                               audio->config.out.bitrate, best_bitrate);
                    }
                    audio->config.out.bitrate = best_bitrate;
                }
            }

            /* sense-check the requested dither */
            if (hb_audio_dither_is_supported(audio->config.out.codec))
            {
                if (audio->config.out.dither_method ==
                    hb_audio_dither_get_default())
                {
                    /* "auto", enable with default settings */
                    audio->config.out.dither_method =
                        hb_audio_dither_get_default_method();
                }
            }
            else if (audio->config.out.dither_method !=
                     hb_audio_dither_get_default())
            {
                /* specific dither requested but dithering not supported */
                hb_log("work: track %d, dithering not supported by codec",
                       audio->config.out.track);
            }
        }
    }

    /* Synchronization */
    sync = hb_sync_init( job );

    /* Video decoder */
    if (title->video_codec == WORK_NONE)
    {
        hb_error("No video decoder set!");
        goto cleanup;
    }
    hb_list_add(job->list_work, (w = hb_get_work(job->h, title->video_codec)));
    w->yield = 1;   // decoders yield to keep sync fifos more even
    w->codec_param = title->video_codec_param;
    w->fifo_in  = job->fifo_mpeg2;
    w->fifo_out = job->fifo_raw;

    for( i = 0; i < hb_list_count( job->list_subtitle ); i++ )
    {
        subtitle = hb_list_item( job->list_subtitle, i );

        if( subtitle )
        {
            subtitle->fifo_in   = hb_fifo_init( FIFO_SMALL, FIFO_SMALL_WAKE );
            // Must set capacity of the raw-FIFO to be set >= the maximum number of subtitle
            // lines that could be decoded prior to a video frame in order to prevent the following
            // deadlock condition:
            //   1. Subtitle decoder blocks trying to generate more subtitle lines than will fit in the FIFO.
            //   2. Blocks the processing of further subtitle packets read from the input stream.
            //   3. And that blocks the processing of any further video packets read from the input stream.
            //   4. And that blocks the sync work-object from running, which is needed to consume the subtitle lines in the raw-FIFO.
            // Since that number is unbounded, the FIFO must be made (effectively) unbounded in capacity.
            subtitle->fifo_raw  = hb_fifo_init( FIFO_UNBOUNDED, FIFO_UNBOUNDED_WAKE );
            subtitle->fifo_sync = hb_fifo_init( FIFO_SMALL, FIFO_SMALL_WAKE );
            subtitle->fifo_out  = hb_fifo_init( FIFO_SMALL, FIFO_SMALL_WAKE );

            w = hb_get_work( job->h, subtitle->codec );
            w->fifo_in = subtitle->fifo_in;
            w->fifo_out = subtitle->fifo_raw;
            w->subtitle = subtitle;
            hb_list_add( job->list_work, w );
        }
    }

    /* Set up the video filter fifo pipeline */
    if( !job->indepth_scan )
    {
        if( job->list_filter )
        {
            int filter_count = hb_list_count( job->list_filter );
            int i;
            hb_fifo_t * fifo_in = job->fifo_sync;

            for( i = 0; i < filter_count; i++ )
            {
                hb_filter_object_t * filter = hb_list_item( job->list_filter, i );

                filter->fifo_in = fifo_in;
                filter->fifo_out = hb_fifo_init( FIFO_MINI, FIFO_MINI_WAKE );
                fifo_in = filter->fifo_out;
            }
            job->fifo_render = fifo_in;
        }
        else if ( !job->list_filter )
        {
            hb_log("work: Internal Error: no filters");
            job->fifo_render = NULL;
        }

        /* Video encoder */
        switch( job->vcodec )
        {
        case HB_VCODEC_FFMPEG_MPEG4:
            w = hb_get_work( job->h, WORK_ENCAVCODEC );
            w->codec_param = AV_CODEC_ID_MPEG4;
            break;
        case HB_VCODEC_FFMPEG_MPEG2:
            w = hb_get_work( job->h, WORK_ENCAVCODEC );
            w->codec_param = AV_CODEC_ID_MPEG2VIDEO;
            break;
        case HB_VCODEC_FFMPEG_VP8:
            w = hb_get_work( job->h, WORK_ENCAVCODEC );
            w->codec_param = AV_CODEC_ID_VP8;
            break;
        case HB_VCODEC_X264:
            w = hb_get_work( job->h, WORK_ENCX264 );
            break;
        case HB_VCODEC_QSV_H264:
        case HB_VCODEC_QSV_H265:
            w = hb_get_work( job->h, WORK_ENCQSV );
            break;
        case HB_VCODEC_THEORA:
            w = hb_get_work( job->h, WORK_ENCTHEORA );
            break;
#ifdef USE_X265
        case HB_VCODEC_X265:
            w = hb_get_work( job->h, WORK_ENCX265 );
            break;
#endif
        }
        // Handle case where there are no filters.  
        // This really should never happen.
        if ( job->fifo_render )
            w->fifo_in  = job->fifo_render;
        else
            w->fifo_in  = job->fifo_sync;

        w->fifo_out = job->fifo_mpeg4;
        w->config   = &job->config;

        hb_list_add( job->list_work, w );

        for( i = 0; i < hb_list_count( job->list_audio ); i++ )
        {
            audio = hb_list_item( job->list_audio, i );

            /*
            * Audio Decoder Thread
            */
            if ( audio->priv.fifo_in )
            {
                w = hb_codec_decoder(job->h, audio->config.in.codec);
                if (w == NULL)
                {
                    hb_error("Invalid input codec: %d", audio->config.in.codec);
                    *job->done_error = HB_ERROR_WRONG_INPUT;
                    *job->die = 1;
                    goto cleanup;
                }
                w->fifo_in  = audio->priv.fifo_in;
                w->fifo_out = audio->priv.fifo_raw;
                w->config   = &audio->priv.config;
                w->audio    = audio;
                w->codec_param = audio->config.in.codec_param;

                hb_list_add( job->list_work, w );
            }

            /*
            * Audio Encoder Thread
            */
            if ( !(audio->config.out.codec & HB_ACODEC_PASS_FLAG ) )
            {
                /*
                * Add the encoder thread if not doing AC-3 pass through
                */
                w = hb_codec_encoder( job->h, audio->config.out.codec);
                if (w == NULL)
                {
                    hb_error("Invalid audio codec: %#x", audio->config.out.codec);
                    w = NULL;
                    *job->done_error = HB_ERROR_WRONG_INPUT;
                    *job->die = 1;
                    goto cleanup;
                }
                w->fifo_in  = audio->priv.fifo_sync;
                w->fifo_out = audio->priv.fifo_out;
                w->config   = &audio->priv.config;
                w->audio    = audio;

                hb_list_add( job->list_work, w );
            }
        }
    }
    
    if( job->chapter_markers && job->chapter_start == job->chapter_end )
    {
        job->chapter_markers = 0;
        hb_log("work: only 1 chapter, disabling chapter markers");
    }

    /* Display settings */
    hb_display_job_info( job );

    /* Init read & write threads */
    if ( reader->init( reader, job ) )
    {
        hb_error( "Failure to initialise thread '%s'", reader->name );
        *job->done_error = HB_ERROR_INIT;
        *job->die = 1;
        goto cleanup;
    }
    reader->done = &job->done;
    reader->thread = hb_thread_init( reader->name, ReadLoop, reader, HB_NORMAL_PRIORITY );

    job->done = 0;

    if( job->list_filter && !job->indepth_scan )
    {
        int filter_count = hb_list_count( job->list_filter );
        int i;

        for( i = 0; i < filter_count; i++ )
        {
            hb_filter_object_t * filter = hb_list_item( job->list_filter, i );

            if( !filter ) continue;

            // Filters were initialized earlier, so we just need
            // to start the filter's thread
            filter->done = &job->done;
            filter->thread = hb_thread_init( filter->name, filter_loop, filter,
                                             HB_LOW_PRIORITY );
        }
    }

    /* Launch processing threads */
    for( i = 0; i < hb_list_count( job->list_work ); i++ )
    {
        w = hb_list_item( job->list_work, i );
        w->done = &job->done;
        w->thread_sleep_interval = 10;
        if( w->init( w, job ) )
        {
            hb_error( "Failure to initialise thread '%s'", w->name );
            *job->done_error = HB_ERROR_INIT;
            *job->die = 1;
            goto cleanup;
        }
        w->thread = hb_thread_init( w->name, work_loop, w,
                                    HB_LOW_PRIORITY );
    }

    if ( job->indepth_scan )
    {
        muxer = NULL;
        w = sync;
        sync->done = &job->done;
    }
    else
    {
        sync->done = &job->done;
        sync->thread_sleep_interval = 10;
        if( sync->init( w, job ) )
        {
            hb_error( "Failure to initialise thread '%s'", w->name );
            *job->done_error = HB_ERROR_INIT;
            *job->die = 1;
            goto cleanup;
        }
        sync->thread = hb_thread_init( sync->name, work_loop, sync,
                                    HB_LOW_PRIORITY );

        // The muxer requires track information that's set up by the encoder
        // init routines so we have to init the muxer last.
        muxer = hb_muxer_init( job );
        w = muxer;
    }

    hb_buffer_t      * buf_in, * buf_out = NULL;

    while ( !*job->die && !*w->done && w->status != HB_WORK_DONE )
    {
        buf_in = hb_fifo_get_wait( w->fifo_in );
        if ( buf_in == NULL )
            continue;
        if ( *job->die )
        {
            if( buf_in )
            {
                hb_buffer_close( &buf_in );
            }
            break;
        }

        buf_out = NULL;
        w->status = w->work( w, &buf_in, &buf_out );

        if( buf_in )
        {
            hb_buffer_close( &buf_in );
        }
        if ( buf_out && w->fifo_out == NULL )
        {
            hb_buffer_close( &buf_out );
        }
        if( buf_out )
        {
            while ( !*job->die )
            {
                if ( hb_fifo_full_wait( w->fifo_out ) )
                {
                    hb_fifo_push( w->fifo_out, buf_out );
                    buf_out = NULL;
                    break;
                }
            }
        }
    }

    if ( buf_out )
    {
        hb_buffer_close( &buf_out );
    }

    hb_handle_t * h = job->h;
    hb_state_t state;
    hb_get_state2( h, &state );

    hb_log("work: average encoding speed for job is %f fps", state.param.working.rate_avg);

    job->done = 1;
    if( muxer != NULL )
    {
        muxer->close( muxer );
        free( muxer );

        if( sync->thread != NULL )
        {
            hb_thread_close( &sync->thread );
            sync->close( sync );
        }
        free( sync );
    }

cleanup:
    /* Stop the write thread (thread_close will block until the muxer finishes) */
    job->done = 1;

    // Close render filter pipeline
    if( job->list_filter )
    {
        int filter_count = hb_list_count( job->list_filter );
        int i;

        for( i = 0; i < filter_count; i++ )
        {
            hb_filter_object_t * filter = hb_list_item( job->list_filter, i );

            if( !filter ) continue;

            if( filter->thread != NULL )
            {
                hb_thread_close( &filter->thread );
            }
            filter->close( filter );
        }
    }

    /* Close work objects */
    while( ( w = hb_list_item( job->list_work, 0 ) ) )
    {
        hb_list_rem( job->list_work, w );
        if( w->thread != NULL )
        {
            hb_thread_close( &w->thread );
            w->close( w );
        }
        free( w );
    }

    hb_list_close( &job->list_work );

    /* Stop the read thread */
    if( reader->thread != NULL )
    {
        hb_thread_close( &reader->thread );
        reader->close( reader );
    }
    free( reader );

    /* Close fifos */
    hb_fifo_close( &job->fifo_mpeg2 );
    hb_fifo_close( &job->fifo_raw );
    hb_fifo_close( &job->fifo_sync );
    hb_fifo_close( &job->fifo_mpeg4 );

    for( i = 0; i < hb_list_count( job->list_subtitle ); i++ )
    {
        subtitle = hb_list_item( job->list_subtitle, i );
        if( subtitle )
        {
            hb_fifo_close( &subtitle->fifo_in );
            hb_fifo_close( &subtitle->fifo_raw );
            hb_fifo_close( &subtitle->fifo_sync );
            hb_fifo_close( &subtitle->fifo_out );
        }
    }
    for( i = 0; i < hb_list_count( job->list_audio ); i++ )
    {
        audio = hb_list_item( job->list_audio, i );
        if( audio->priv.fifo_in != NULL )
            hb_fifo_close( &audio->priv.fifo_in );
        if( audio->priv.fifo_raw != NULL )
            hb_fifo_close( &audio->priv.fifo_raw );
        if( audio->priv.fifo_sync != NULL )
            hb_fifo_close( &audio->priv.fifo_sync );
        if( audio->priv.fifo_out != NULL )
            hb_fifo_close( &audio->priv.fifo_out );
    }

    if( job->list_filter )
    {
        for( i = 0; i < hb_list_count( job->list_filter ); i++ )
        {
            hb_filter_object_t * filter = hb_list_item( job->list_filter, i );
            hb_fifo_close( &filter->fifo_out );
        }
    }

    if( job->indepth_scan )
    {
        /* Before closing the title print out our subtitle stats if we need to
         * find the highest and lowest. */
        for( i = 0; i < hb_list_count( job->list_subtitle ); i++ )
        {
            subtitle = hb_list_item( job->list_subtitle, i );

            hb_log( "Subtitle track %d (id 0x%x) '%s': %d hits (%d forced)",
                    subtitle->track, subtitle->id, subtitle->lang,
                    subtitle->hits, subtitle->forced_hits );

            if( subtitle->hits == 0 )
                continue;

            if( subtitle_highest < subtitle->hits )
            {
                subtitle_highest = subtitle->hits;
            }

            if( subtitle_lowest == 0 ||
                subtitle_lowest > subtitle->hits )
            {
                subtitle_lowest = subtitle->hits;
                subtitle_lowest_id = subtitle->id;
            }

            // pick the track with fewest forced hits
            if( subtitle->forced_hits > 0 &&
                ( subtitle_forced_hits == 0 ||
                  subtitle_forced_hits > subtitle->forced_hits ) )
            {
                subtitle_forced_id = subtitle->id;
                subtitle_forced_hits = subtitle->forced_hits;
            }
        }

        if( subtitle_forced_id && job->select_subtitle_config.force )
        {
            /* If there is a subtitle stream with forced subtitles and forced-only
             * is set, then select it in preference to the lowest. */
            subtitle_hit = subtitle_forced_id;
            hb_log( "Found a subtitle candidate with id 0x%x (contains forced subs)",
                    subtitle_hit );
        }
        else if( subtitle_lowest > 0 &&
                 subtitle_lowest < ( subtitle_highest * 0.1 ) )
        {
            /* OK we have more than one, and the lowest is lower,
             * but how much lower to qualify for turning it on by
             * default?
             *
             * Let's say 10% as a default. */
            subtitle_hit = subtitle_lowest_id;
            hb_log( "Found a subtitle candidate with id 0x%x", subtitle_hit );
        }
        else
        {
            hb_log( "No candidate detected during subtitle scan" );
        }

        for( i = 0; i < hb_list_count( job->list_subtitle ); i++ )
        {
            subtitle = hb_list_item( job->list_subtitle, i );
            if( subtitle->id == subtitle_hit )
            {
                subtitle->config = job->select_subtitle_config;
                // Remove from list since we are taking ownership
                // of the subtitle.
                hb_list_rem( job->list_subtitle, subtitle );
                interjob->select_subtitle = subtitle;
                break;
            }
        }
    }

    hb_buffer_pool_free();
    
    hb_job_close( &job );
}

static inline void copy_chapter( hb_buffer_t * dst, hb_buffer_t * src )
{
    // Propagate any chapter breaks for the worker if and only if the
    // output frame has the same time stamp as the input frame (any
    // worker that delays frames has to propagate the chapter marks itself
    // and workers that move chapter marks to a different time should set
    // 'src' to NULL so that this code won't generate spurious duplicates.)
    if( src && dst && src->s.start == dst->s.start)
    {
        // restore log below to debug chapter mark propagation problems
        dst->s.new_chap = src->s.new_chap;
    }
}

/**
 * Performs the work object's specific work function.
 * Loops calling work function for associated work object. Sleeps when fifo is full.
 * Monitors work done indicator.
 * Exits loop when work indiactor is set.
 * @param _w Handle to work object.
 */
static void work_loop( void * _w )
{
    hb_work_object_t * w = _w;
    hb_buffer_t      * buf_in = NULL, * buf_out = NULL;

    while( !*w->done && w->status != HB_WORK_DONE )
    {
        buf_in = hb_fifo_get_wait( w->fifo_in );
        if ( buf_in == NULL )
            continue;
        if ( *w->done )
        {
            if( buf_in )
            {
                hb_buffer_close( &buf_in );
            }
            break;
        }
        // Invalidate buf_out so that if there is no output
        // we don't try to pass along junk.
        buf_out = NULL;
        w->status = w->work( w, &buf_in, &buf_out );

        copy_chapter( buf_out, buf_in );

        if( buf_in )
        {
            hb_buffer_close( &buf_in );
        }
        if ( buf_out && w->fifo_out == NULL )
        {
            hb_buffer_close( &buf_out );
        }
        if( buf_out )
        {
            while ( !*w->done )
            {
                if ( hb_fifo_full_wait( w->fifo_out ) )
                {
                    hb_fifo_push( w->fifo_out, buf_out );
                    buf_out = NULL;
                    break;
                }
            }
        }
        if (w->yield)
        {
            hb_yield();
        }
    }
    if ( buf_out )
    {
        hb_buffer_close( &buf_out );
    }

    // Consume data in incoming fifo till job complete so that
    // residual data does not stall the pipeline
    while( !*w->done )
    {
        buf_in = hb_fifo_get_wait( w->fifo_in );
        if ( buf_in != NULL )
            hb_buffer_close( &buf_in );
    }
}

/**
 * Performs the filter object's specific work function.
 * Loops calling work function for associated filter object. 
 * Sleeps when fifo is full.
 * Monitors work done indicator.
 * Exits loop when work indiactor is set.
 * @param _w Handle to work object.
 */
static void filter_loop( void * _f )
{
    hb_filter_object_t * f = _f;
    hb_buffer_t      * buf_in, * buf_out = NULL;

    while( !*f->done && f->status != HB_FILTER_DONE )
    {
        buf_in = hb_fifo_get_wait( f->fifo_in );
        if ( buf_in == NULL )
            continue;

        // Filters can drop buffers.  Remember chapter information
        // so that it can be propagated to the next buffer
        if ( buf_in->s.new_chap )
        {
            f->chapter_time = buf_in->s.start;
            f->chapter_val = buf_in->s.new_chap;
            // don't let 'filter_loop' put a chapter mark on the wrong buffer
            buf_in->s.new_chap = 0;
        }
        if ( *f->done )
        {
            if( buf_in )
            {
                hb_buffer_close( &buf_in );
            }
            break;
        }

        buf_out = NULL;

#ifdef USE_QSV
        hb_buffer_t *last_buf_in = buf_in;
#endif

        f->status = f->work( f, &buf_in, &buf_out );

#ifdef USE_QSV
        if (f->status == HB_FILTER_DELAY &&
            last_buf_in->qsv_details.filter_details != NULL && buf_out == NULL)
        {
            hb_filter_private_t_qsv *qsv_user = buf_in ? buf_in->qsv_details.filter_details : last_buf_in->qsv_details.filter_details ;
            qsv_user->post.status = f->status;

            hb_lock(qsv_user->post.frame_completed_lock);
            qsv_user->post.frame_go = 1;
            hb_cond_broadcast(qsv_user->post.frame_completed);
            hb_unlock(qsv_user->post.frame_completed_lock);

        }
#endif
        if ( buf_out && f->chapter_val && f->chapter_time <= buf_out->s.start )
        {
            buf_out->s.new_chap = f->chapter_val;
            f->chapter_val = 0;
        }

        if( buf_in )
        {
            hb_buffer_close( &buf_in );
        }
        if ( buf_out && f->fifo_out == NULL )
        {
            hb_buffer_close( &buf_out );
        }
        if( buf_out )
        {
            while ( !*f->done )
            {
                if ( hb_fifo_full_wait( f->fifo_out ) )
                {
                    hb_fifo_push( f->fifo_out, buf_out );
                    buf_out = NULL;
                    break;
                }
            }
        }
    }
    if ( buf_out )
    {
        hb_buffer_close( &buf_out );
    }

    // Consume data in incoming fifo till job complete so that
    // residual data does not stall the pipeline
    while( !*f->done )
    {
        buf_in = hb_fifo_get_wait( f->fifo_in );
        if ( buf_in != NULL )
            hb_buffer_close( &buf_in );
    }
}