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avformat/matroskadec: Fix handling gigantic durations
matroska_parse_block currently asserts that the duration is not equal to AV_NOPTS_VALUE, but there is nothing that actually guarantees this. It is easy to create (spec-compliant) files which run into this assert; so replace it and instead cap the duration to INT64_MAX, as the duration field of an AVPacket is an int64_t. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> (cherry picked from commit 3714d452b894821591a2fbafdd1b8ef15abe4be6) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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@ -3301,7 +3301,8 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
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st = track->stream;
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if (st->discard >= AVDISCARD_ALL)
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return res;
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av_assert1(block_duration != AV_NOPTS_VALUE);
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if (block_duration > INT64_MAX)
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block_duration = INT64_MAX;
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block_time = sign_extend(AV_RB16(data), 16);
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data += 2;
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