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authorJohn Stebbins <[email protected]>2017-02-21 15:38:53 -0700
committerJohn Stebbins <[email protected]>2017-02-21 15:38:53 -0700
commit380059d4d8cf245e3667a5c92159f7b294d682ac (patch)
treea76cc420a860e4e5d27ba5d1636408b7b7ed4d70 /contrib/ffmpeg
parente2b3a1e8de375248ce72f16083389e8ce3b6e48e (diff)
libav: fix mkv seek crash
Remove hopelessly broken code that attempted to rewind the seek point to a position in the file where subtitles in every subtitle track after the seek time are after the computed position.
Diffstat (limited to 'contrib/ffmpeg')
-rw-r--r--contrib/ffmpeg/A13-mkv-fix-seek-crash.patch57
1 files changed, 57 insertions, 0 deletions
diff --git a/contrib/ffmpeg/A13-mkv-fix-seek-crash.patch b/contrib/ffmpeg/A13-mkv-fix-seek-crash.patch
new file mode 100644
index 000000000..3563855b1
--- /dev/null
+++ b/contrib/ffmpeg/A13-mkv-fix-seek-crash.patch
@@ -0,0 +1,57 @@
+From 4b73e7f3606fe0a33c258c802998b4e24ae24fb0 Mon Sep 17 00:00:00 2001
+From: John Stebbins <[email protected]>
+Date: Tue, 21 Feb 2017 15:14:51 -0700
+Subject: [PATCH] matroskadec: remove broken subtitle seek code
+
+It looks up an index on one stream, and then uses that index on a
+different stream. If nb_index_entries is different on the streams,
+kaboom!
+---
+ libavformat/matroskadec.c | 16 ++--------------
+ 1 file changed, 2 insertions(+), 14 deletions(-)
+
+diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
+index 4e121b6..d88088a 100644
+--- a/libavformat/matroskadec.c
++++ b/libavformat/matroskadec.c
+@@ -2693,7 +2693,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
+ MatroskaDemuxContext *matroska = s->priv_data;
+ MatroskaTrack *tracks = NULL;
+ AVStream *st = s->streams[stream_index];
+- int i, index, index_sub, index_min;
++ int i, index;
+
+ /* Parse the CUES now since we need the index data to seek. */
+ if (matroska->cues_parsing_deferred) {
+@@ -2720,27 +2720,15 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
+ if (index < 0)
+ return 0;
+
+- index_min = index;
+ tracks = matroska->tracks.elem;
+ for (i = 0; i < matroska->tracks.nb_elem; i++) {
+ tracks[i].audio.pkt_cnt = 0;
+ tracks[i].audio.sub_packet_cnt = 0;
+ tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
+ tracks[i].end_timecode = 0;
+- if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
+- tracks[i].stream->discard != AVDISCARD_ALL) {
+- index_sub = av_index_search_timestamp(
+- tracks[i].stream, st->index_entries[index].timestamp,
+- AVSEEK_FLAG_BACKWARD);
+- if (index_sub >= 0 &&
+- st->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
+- st->index_entries[index].timestamp -
+- st->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
+- index_min = index_sub;
+- }
+ }
+
+- avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
++ avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
+ matroska->current_id = 0;
+ matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
+ matroska->skip_to_timecode = st->index_entries[index].timestamp;
+--
+2.9.3
+