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

Michael Niedermayer michael at niedermayer.cc
Tue Sep 6 05:57:06 EEST 2016

On Mon, Sep 05, 2016 at 10:04:35PM -0300, James Almer wrote:
> 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.

that seems to be a regression since

IIRC the intended timebase is 1/50 for this kind of content
(allowing the support of interlaced and field duplicated content to
 appear later)

> And with or without the code, the resulting files play the
> same with the players i tried.

Higher framerates / finer timebases need noticably more space to
be stored in avi, thats not the case for other formats and thats
one reason why avi is treated as a special case.

ill try to look tomorrow why its 100fps since the previous
codecpar patches. Though 100fps is not nearly as bad as 600fps
600 has ~6 times the overhead


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

It is what and why we do it that matters, not just one of them.
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