[FFmpeg-devel] [PATCH] avdevice/lavfi: output wrapped AVFrames

[Paul B Mahol]

On Sat, Jul 2, 2022 at 10:55 AM Michael Niedermayer <michael at niedermayer.cc>
wrote:

> On Thu, Jun 30, 2022 at 05:22:06PM +0200, Timo Rothenpieler wrote:
> > This avoids an extra copy of potentially quite big video frames.
> > Instead of copying the entire frames data into a rawvideo packet it
> > packs the frame into a wrapped avframe packet and passes it through
> > as-is.
> > Unfortunately, wrapped avframes are set up to be video frames, so the
> > audio frames unfortunately continue to be copied.
> >
> > Additionally, this enabled passing through video frames that previously
> > were impossible to process, like hardware frames or other special
> > formats that couldn't be packed into a rawvideo packet.
> > ---
> >  libavdevice/lavfi.c                       | 87 +++++++++--------------
> >  tests/ref/fate/filter-metadata-cropdetect |  3 +-
> >  2 files changed, 36 insertions(+), 54 deletions(-)
>
> seems to get this stuck:
> ./ffmpeg -f lavfi -i
> 'amovie=fate-suite/wavpack/num_channels/eva_2.22_6.1_16bit-partial.wv,asplit=3[out1][a][b];
> [a]showwaves=s=340x240,pad=iw:ih*2[waves];
> [b]showspectrum=s=340x240[spectrum]; [waves][spectrum] overlay=0:h [out0]'
>  file-waves.avi
>
> (stuck as in OOM killed)
>

OOM killed or its is slow just because of showspectrum filter not
supporting arbitrary sizes in realt time?.

>
> thx
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Nations do behave wisely once they have exhausted all other alternatives.
> -- Abba Eban
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