[FFmpeg-devel] [PATCH] ffmpeg.c: allow ffmpeg to output stats for each video stream

[Michael Niedermayer]

On Fri, Jun 22, 2018 at 04:03:38PM +0800, Wang Cao wrote:
> Make ffmpeg to output stats for each video/audio streams and each ouptut file ffmpeg output log in print_report. The report of video/audio sizes is clear now as previously all output video/audio sizes were combined to report and it is unclear such stats is for one output files or aggregates for all output files.
> 
> Signed-off-by: Wang Cao <wangcao at google.com>
> ---
>  fftools/ffmpeg.c | 52 +++++++++++++++++++++++++++++++++---------------
>  1 file changed, 36 insertions(+), 16 deletions(-)

This changes the printed values
./ffmpeg -i ~/videos/matrixbench_mpeg2.mpg -qscale 2  -vframes 3 -an  test2.avi

frame=    3 fps=0.0 q=2.0 Lsize=      51kB time=00:00:00.12 bitrate=3495.7kbits/s speed=  12x
video:51kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.128063%

vs.

frame=    3 fps=0.0 q=2.0 Lsize=      57kB time=00:00:00.12 bitrate=3884.7kbits/s speed=11.2x    
video:51kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.128063%

the file is the same 

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If a bugfix only changes things apparently unrelated to the bug with no
further explanation, that is a good sign that the bugfix is wrong.
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