[Cin] SVT-AV1 encoding quite fast on x86_64

[Andrea paz]

> At first I tried to run it on Leap 15.5, but its glibc 2.31 was too old.
> On Tumbleweed-Slowroll the cin-aom-38_svt.AppImage started ok.

Thanks for the test. So it is useless to create appimage from one
rolling because they only work on other rolling.

> But unhappily it was a bit even slower on my machine than the previous aom.
> And continued playback Video with aspect ratio 4:3 and scratch sound on the Audio.
> smpte170m colors seems for me to be for NTSC, and not for PAL video.
> Rendering took 0:41:08, almost 6 times the clip duration

I too have a lot of confusion about how CinGG treats colors in
specific cases. See the notions on Kernel.org if they can help you:

https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html

In the meantime, I'll post the ffprobes from my tests (project's size
1920x1080; 16:9. source1: DNxHR, 1080p; source2: h264, 2160p; source3:
VP9, 640x480):

AOM_3.8.0:

$ ffprobe -hide_banner test_aom_38.webm
[libdav1d @ 0x5619aeb26140] libdav1d 1.3.0
Input #0, matroska,webm, from 'test_aom_38.webm':
  Metadata:
    ENCODER         : Lavf60.16.100
  Duration: 00:01:12.17, start: 0.000000, bitrate: 1266 kb/s
  Stream #0:0: Video: av1 (Main), yuv420p(pc,
bt2020nc/unknown/unknown, progressive), 1920x1080, SAR 1:1 DAR 16:9,
24 fps, 24 tbr, 1k tbn
    Metadata:
      DURATION        : 00:01:12.128000000
  Stream #0:1(ita): Audio: vorbis, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:01:12.170000000
[libdav1d @ 0x5619aeb62400] libdav1d 1.3.0

(12.5 fps; 10.9 MB,)

AOM-SVT:

$ ffprobe -hide_banner test_aom_svt.webm
[libdav1d @ 0x55b740a0a140] libdav1d 1.3.0
Input #0, matroska,webm, from 'test_aom_svt.webm':
  Metadata:
    ENCODER         : Lavf60.16.100
  Duration: 00:01:12.17, start: 0.000000, bitrate: 1369 kb/s
  Stream #0:0: Video: av1 (Main), yuv420p(pc,
bt2020nc/unknown/unknown, progressive), 1920x1080, SAR 1:1 DAR 16:9,
24 fps, 24 tbr, 1k tbn
    Metadata:
      DURATION        : 00:01:12.128000000
  Stream #0:1(ita): Audio: vorbis, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:01:12.170000000
[libdav1d @ 0x55b740a46400] libdav1d 1.3.0

(11.8 MB; 58 fps)

The video, but especially the audio, seem to me to be of slightly
lower quality than the original sources.

> If SVT-AV1 1.8.0 rendering is possible with cin-aom-38_svt.AppImage, where do you select this?
Among the webm presets should also appear av1-svt.webm, the profile
created by Andrew; see image:

https://postimg.cc/cgjQfR11