From da904faaa546afb7dfae9e7633028469a2670937 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 5 Mar 2016 13:29:16 +0100 Subject: [PATCH] avcodec: try to document timebase a bit more Signed-off-by: Michael Niedermayer --- libavcodec/avcodec.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index e249e65bee9..d676c57c055 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. -- 2.39.2