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

[Andrew Randrianasulu]

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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