fix a problem with resolution changes in h.264

First, the scaling code in decavcodec.c was broken and didn't properly
compensate for frames that had a different resolution than the rest of
the stream.

Second, libav can not handle resolution changes when doing frame based
multi-threading.  So disable threading when resolution changes are
detected.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@4295 b64f7644-9d1e-0410-96f1-a4d463321fa5

1 files changed, 17 insertions, 0 deletions

diff --git a/libhb/scan.c b/libhb/scan.c
index 29547bc9b..df20d2069 100644
--- a/libhb/scan.c
+++ b/libhb/scan.c
@@ -468,6 +468,22 @@ static void most_common_info( info_list_t *info_list, hb_work_info_t *info )
     *info = info_list[biggest].info;
 }
 
+static int has_resolution_change( info_list_t *info_list )
+{
+    int w, h, i;
+
+    if( !info_list[0].count )
+        return 0;
+    w = info_list[0].info.width;
+    h = info_list[0].info.height;
+    for ( i = 1; info_list[i].count; ++i )
+    {
+        if ( w != info_list[i].info.width || h != info_list[i].info.height )
+            return 1;
+    }
+    return 0;
+}
+
 static int is_close_to( int val, int target, int thresh )
 {
     int diff = val - target;
@@ -819,6 +835,7 @@ skip_preview:
         hb_work_info_t vid_info;
         most_common_info( info_list, &vid_info );
 
+        title->has_resolution_change = has_resolution_change( info_list );
         if ( title->video_codec_name == NULL )
         {
             title->video_codec_name = strdup( vid_info.name );