[Cin] 4k test videos from Ultravideo (very huge!)

[Andrew Randrianasulu]

i hacked ffmpeg-4.4 so it exposes this list of pix_fmts for cingg to
display.
and now you can make huuuuge y4m files with  high bit depth (10/12/14/16
and better subsampling / 422, 444)


unfortunately it seems our processing of 'strict' option is broken, so i
hacked out err message... from libavformat/yuv4mpegpipe muxer..

not sure if vdpau/vaapi/nvenc decoding/encoding still work, i only saw ref.
to this wrapped_avframe in declink/opengl/xv *devices* (currently unused by
cingg? ) and vapoursynth muxer...

On Tuesday, June 15, 2021, Andrew Randrianasulu <randrianasulu at gmail.com>
wrote:

> i was looking at y4m piping at high bit depth (inspired by latest x264
> patches), and found two interesting links..
>
> https://forum.videohelp.com/threads/399289-Need-help-
> converting-RAW-YUV-to-Y4M
>
> there is claim none of Linux video editors were able to open raw
> teststreams.
>
> link provided in message doesn't work for me, but this one worked
>
> http://ultravideo.fi/#testsequences
>
> if you have ssd/nvme disk and/or 4 gb of free ram to play this - you can
> test)
>
> another link is about ffmpeg itself, it has bug in this area in early
> 2017, but hopefully it was fixed?
>
> https://forum.doom9.org/archive/index.php/t-174314.html
>
> until very lately I was under impression you only can pipe 8-bit (per
> channel) video.. but i was wrong? (not tested with cingg yet)
>
>
>
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