Commit 5b28c8c3 authored by Michael Niedermayer's avatar Michael Niedermayer

time_base description by Rich Felker | dalias, aerifal cx

Originally committed as revision 4536 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent cc884a35
......@@ -732,14 +732,17 @@ typedef struct AVCodecContext {
void *extradata;
int extradata_size;
/* video only */
/**
* time base in which the timestamps are specified.
* this is the fundamental unit of time (in seconds) in terms
* of which frame timestamps are represented. for fixed-fps content,
* timebase should be 1/framerate and timestamp increments should be
* identically 1.
* - encoding: MUST be set by user
* - decoding: set by lavc.
*/
AVRational time_base;
/* video only */
/**
* picture width / height.
* - encoding: MUST be set by user.
......
......@@ -229,6 +229,13 @@ typedef struct AVStream {
int codec_info_nb_frames;
/* encoding: PTS generation when outputing stream */
AVFrac pts;
/**
* this is the fundamental unit of time (in seconds) in terms
* of which frame timestamps are represented. for fixed-fps content,
* timebase should be 1/framerate and timestamp increments should be
* identically 1.
*/
AVRational time_base;
int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
/* ffmpeg.c private use */
......
......@@ -199,7 +199,10 @@ AVStream *add_video_stream(AVFormatContext *oc, int codec_id)
/* resolution must be a multiple of two */
c->width = 352;
c->height = 288;
/* frames per second */
/* time base: this is the fundamental unit of time (in seconds) in terms
of which frame timestamps are represented. for fixed-fps content,
timebase should be 1/framerate and timestamp increments should be
identically 1. */
c->time_base.den = STREAM_FRAME_RATE;
c->time_base.num = 1;
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
......
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