[FFmpeg-devel] [PATCH] ffmpeg: drop format specific stream copy heuristics

James Almer jamrial at gmail.com
Tue Sep 6 04:04:35 EEST 2016

On 9/5/2016 12:41 PM, Michael Niedermayer wrote:
> On Mon, Sep 05, 2016 at 04:41:52PM +0200, Clément Bœsch wrote:
>> From: Clément Bœsch <clement at stupeflix.com>
>> These adjusted codec fields do not seem to be in use anymore and prevent
>> the convert of ffmpeg*.c to codecpar.
>  ./ffmpeg  -i ~/tickets/4914/xdcam8mp2-1s_small.ts -c:v copy out.mxf
> fails, no output anymore
> ./ffmpeg -i matrixbench_mpeg2.mpg -c:v copy -t 1 test.avi
> the output now has 600fps

Even with this code in place the resulting stream in the avi is reported
as 100 fps. And with or without the code, the resulting files play the
same with the players i tried.
mpc-hc suffers from choppy playback with both files due to tons of dropped
frames per second, and WMP directly refuses to play it. Only ffplay and
mpv play both fine.

> ./ffmpeg -i ~/tickets/236/fcp_export8.mov -codec copy -map 0 out.mov
> something goes terribly wrong with the timecode tracks
> "fps 2997 is too large"
> If you want more cases that this breaks, it should be easy to find
> i think fate does not test stream copy very well
> [...]
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