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automatic framerate selection

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Originally committed as revision 3132 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-05-12 16:51:39 +00:00
parent fcee016467
commit 22f7a0601e
1 changed files with 18 additions and 1 deletions
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19
ffmpeg.c
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@ -17,6 +17,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/ */
#define HAVE_AV_CONFIG_H #define HAVE_AV_CONFIG_H
#include <limits.h>
#include "avformat.h" #include "avformat.h"
#include "framehook.h" #include "framehook.h"
@ -2751,18 +2752,34 @@ static void opt_output_file(const char *filename)
codec_id = video_codec_id; codec_id = video_codec_id;
video_enc->codec_id = codec_id; video_enc->codec_id = codec_id;
codec = avcodec_find_encoder(codec_id);
video_enc->bit_rate = video_bit_rate; video_enc->bit_rate = video_bit_rate;
video_enc->bit_rate_tolerance = video_bit_rate_tolerance; video_enc->bit_rate_tolerance = video_bit_rate_tolerance;
video_enc->frame_rate = frame_rate; video_enc->frame_rate = frame_rate;
video_enc->frame_rate_base = frame_rate_base; video_enc->frame_rate_base = frame_rate_base;
if(codec && codec->supported_framerates){
const AVRational *p= codec->supported_framerates;
AVRational req= (AVRational){frame_rate, frame_rate_base};
const AVRational *best=NULL;
AVRational best_error= (AVRational){INT_MAX, 1};
for(; p->den!=0; p++){
AVRational error= av_sub_q(req, *p);
if(error.num <0) error.num *= -1;
if(av_cmp_q(error, best_error) < 0){
best_error= error;
best= p;
}
}
video_enc->frame_rate = best->num;
video_enc->frame_rate_base= best->den;
}
video_enc->width = frame_width + frame_padright + frame_padleft; video_enc->width = frame_width + frame_padright + frame_padleft;
video_enc->height = frame_height + frame_padtop + frame_padbottom; video_enc->height = frame_height + frame_padtop + frame_padbottom;
video_enc->sample_aspect_ratio = av_d2q(frame_aspect_ratio*frame_height/frame_width, 255); video_enc->sample_aspect_ratio = av_d2q(frame_aspect_ratio*frame_height/frame_width, 255);
video_enc->pix_fmt = frame_pix_fmt; video_enc->pix_fmt = frame_pix_fmt;
codec = avcodec_find_encoder(codec_id);
if(codec && codec->pix_fmts){ if(codec && codec->pix_fmts){
const enum PixelFormat *p= codec->pix_fmts; const enum PixelFormat *p= codec->pix_fmts;
for(; *p!=-1; p++){ for(; *p!=-1; p++){