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ffmpeg: document avi special case

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Michael Niedermayer
2012-02-05 05:14:26 +01:00
parent bfb5ba8495
commit 982783ac49
1 changed files with 5 additions and 0 deletions
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ffmpeg.c
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@@ -2448,6 +2448,11 @@ static int transcode_init(OutputFile *output_files, int nb_output_files,
codec->extradata_size= icodec->extradata_size; codec->extradata_size= icodec->extradata_size;
codec->time_base = ist->st->time_base; codec->time_base = ist->st->time_base;
/*
* Avi is a special case here because it supports variable fps but
* having the fps and timebase differe significantly adds quite some
* overhead
*/
if(!strcmp(oc->oformat->name, "avi")) { if(!strcmp(oc->oformat->name, "avi")) {
if ( copy_tb<0 && av_q2d(icodec->time_base)*icodec->ticks_per_frame > 2*av_q2d(ist->st->time_base) if ( copy_tb<0 && av_q2d(icodec->time_base)*icodec->ticks_per_frame > 2*av_q2d(ist->st->time_base)
&& av_q2d(ist->st->time_base) < 1.0/500 && av_q2d(ist->st->time_base) < 1.0/500