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avformat/wtvdec: ignore mpeg2 extradata

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Files produced by windows media center contain meaningless mpeg1 sequence
header. The mpeg2 decoder detects the presence mpeg1 sequence header start
codes and attempts to decode the stream as mpeg1. (This problem introduced
in 73a2d16b.)

Fixes ticket #3601.

Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Peter Ross 2014-05-01 22:22:09 +10:00 committed by Michael Niedermayer
parent 58f4d1266b
commit be098f6237
1 changed files with 1 additions and 13 deletions
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14
libavformat/wtvdec.c
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@ -694,19 +694,7 @@ static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
avio_skip(pb, FFMAX(size - consumed, 0));
} else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
uint64_t consumed = parse_videoinfoheader2(s, st);
if (size - consumed >= 20) {
uint32_t count;
consumed += 20;
avio_skip(pb, 4);
count = avio_rl32(pb);
count = FFMIN(count, size - consumed);
avio_skip(pb, 12);
if (count && ff_get_extradata(st->codec, pb, count) < 0) {
ff_free_stream(s, st);
return NULL;
}
consumed += count;
}
/* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
avio_skip(pb, FFMAX(size - consumed, 0));
} else {
if (ff_guidcmp(formattype, ff_format_none))