Re: Looking for advice - ffmpeg-free and wf-recorder

[Bob Hepple <bob.hepple@xxxxxxxxx>]

> What if you use libvpx-vp9 for video, opus for audio, and use an mkv file extension? Does it work better?

No, it doesn't  ...

$ wf-recorder -c libvpx-vp9 -C opus -f recording.mkv

$ file recording.mkv
recording.mkv: Matroska data

... but it still takes a looong time to build the index.

On VP9:

Maybe I'll just settle on libvpx-vp9 and patch the source so that on SIGINT it prints "SIGINT received: please wait for index building". That's the easiest fix - but maybe we'll get 'oh fedora is soooo sloooow' whinges.

On VP8:

alabastr gave me the hint that using "--muxer webm" would make v8 work - and it terminates quickly, so this is another possibility.

The only question is - is it naf to have a webm in an mp4? Also, is it too naf to patch the source to force '--muxer webm' if codec is detected as libvpx?

$ wf-recorder -c libvpx -m webm
Output file "recording.mp4" exists. Overwrite? Y/n: y
selected region 0,0 0x0
Using video filter: null
[libvpx @ 0x7f6d40001e80] v1.12.0
[libvpx @ 0x7f6d40001e80] Neither bitrate nor constrained quality specified, using default CRF of 32 and bitrate of 256kbit/sec
Output #0, webm, to 'recording.mp4':
  Stream #0:0: Video: vp8, yuv420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 256 kb/s

^C

$ file recording.mp4
recording.mp4: WebM  <<<<< TOO NAF?

On Sun, 18 Dec 2022 at 10:54, Neal Gompa <ngompa13@xxxxxxxxx> wrote:

On Sat, Dec 17, 2022 at 7:49 PM Bob Hepple <bob.hepple@xxxxxxxxx> wrote:
>
> Thanks to all of you for the helpful hints!
>
> I will release in f37 too as suggested - I understand that I can only retire from rpmfusion in rawhide/f38, but I guess that's OK.
>
> libvpx-vp9 does indeed work in both ffmpegs - the only downside is that it takes >25s to terminate on SIGINT ^C (the normal way to stop wf-recorder). Many users will grow impatient and use pkill/SIGTERM and get a corrupt mp4 file - I certainly did at first. Not the best experience. I have taken this up with upstream.
>
> libvpx (vp8) does not work at all - again, maybe an upstream issue.
>
> So I don't have an ideal codec candidate that I am quite happy to unleash on the world at the moment - upstream may give me a clue.
>
> Or should I just go ahead with libvpx-vp9?
>

What if you use libvpx-vp9 for video, opus for audio, and use an mkv
file extension? Does it work better?



--
真実はいつも一つ！/ Always, there's only one truth!
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