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avformat/oggparsevp8: fix pts calculation on pages ending with an invisible frame

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Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2016-07-12 17:05:42 -03:00
parent 114870dbc9
commit 5adfbd3918
1 changed files with 5 additions and 1 deletions
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6
libavformat/oggparsevp8.c
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@ -82,7 +82,11 @@ static uint64_t vp8_gptopts(AVFormatContext *s, int idx,
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
uint64_t pts = (granule >> 32);
int invcnt = !((granule >> 30) & 3);
// If page granule is that of an invisible vp8 frame, its pts will be
// that of the end of the next visible frame. We substract 1 for those
// to prevent messing up pts calculations.
uint64_t pts = (granule >> 32) - invcnt;
uint32_t dist = (granule >> 3) & 0x07ffffff;
if (!dist)