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avcodec/ituh263dec: Correct timestamp recovery for B frames

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Improves u263_b-frames_5.avi

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-01 20:20:07 +01:00
parent 71ca855c9d
commit 0126cd95cc
1 changed files with 3 additions and 2 deletions
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5
libavcodec/ituh263dec.c
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@ -928,8 +928,9 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
}
/* temporal reference */
i = get_bits(&s->gb, 8); /* picture timestamp */
if( (s->picture_number&~0xFF)+i < s->picture_number)
i+= 256;
i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
s->picture_number= (s->picture_number&~0xFF) + i;
/* PTYPE starts here */