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| author | Michael Niedermayer <michael@niedermayer.cc> | 2016-03-05 13:29:16 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-03-07 23:00:50 +0100 |
| commit | da904faaa546afb7dfae9e7633028469a2670937 (patch) | |
| tree | 548fb0c59a8592e29e708b6d58a1bc17fc2313ba | |
| parent | f20cdcbc055d128dc21ddd26c09cbbdf1910778c (diff) | |
| download | ffmpeg-da904faaa546afb7dfae9e7633028469a2670937.tar.gz | |
avcodec: try to document timebase a bit more
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/avcodec.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index e249e65bee..d676c57c05 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -1669,7 +1669,15 @@ typedef struct AVCodecContext { * timebase should be 1/framerate and timestamp increments should be * identically 1. * This often, but not always is the inverse of the frame rate or field rate - * for video. + * for video. 1/time_base is not the average frame rate if the frame rate is not + * constant. + * + * Like containers, elementary streams also can store timestamps, 1/time_base + * is the unit in which these timestamps are specified. + * As example of such codec time base see ISO/IEC 14496-2:2001(E) + * vop_time_increment_resolution and fixed_vop_rate + * (fixed_vop_rate == 0 implies that it is different from the framerate) + * * - encoding: MUST be set by user. * - decoding: the use of this field for decoding is deprecated. * Use framerate instead. |