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ffmpeg: Use filter graph output frame rate also for frame duration estimation

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Previously the duration was sometimes wrong, this addition
limits the value and improves which frames are choosen when
reducing the frame rate

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-01-16 20:15:15 +01:00
parent 7b32856011
commit d3d9a00bcd
1 changed files with 8 additions and 0 deletions
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8
ffmpeg.c
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@ -895,6 +895,7 @@ static void do_video_out(AVFormatContext *s,
double duration = 0;
int frame_size = 0;
InputStream *ist = NULL;
AVFilterContext *filter = ost->filter->filter;
if (ost->source_index >= 0)
ist = input_streams[ost->source_index];
@ -902,6 +903,13 @@ static void do_video_out(AVFormatContext *s,
if(ist && ist->st->start_time != AV_NOPTS_VALUE && ist->st->first_dts != AV_NOPTS_VALUE && ost->frame_rate.num)
duration = 1/(av_q2d(ost->frame_rate) * av_q2d(enc->time_base));
// We take the conservative approuch here and take the minimum even though
// this should be correct on its own but a value too small is harmless, one
// too big can lead to errors
if (filter->inputs[0]->frame_rate.num > 0 &&
filter->inputs[0]->frame_rate.den > 0)
duration = FFMIN(duration, 1/(av_q2d(filter->inputs[0]->frame_rate) * av_q2d(enc->time_base)));
if (!ost->filters_script &&
!ost->filters &&
next_picture &&