[noggin]

Hi all !

I experiment trouble with some recordings from my Capture Card Elgato 4k on the Amazon 4k stick.

Seems related to 4:2:2 chroma :

see: https://paste.kodi.tv/ubetifudow

I have no problem if I force recording with a 4:2:0 profile instead of 4:2:2 .
I think it is related to hardware decoding because such things happen on some ndvidia cards with vdpau instead of vaapi.
Does it sound something to you ?

Best regards.

Very few devices support hardware accelerated decode of anything other than 4:2:0 subsampled video.  4:2:2 will almost always require software decoding whether in MPEG2, h.264/AVC or h.265/HEVC.

(The one exception to this is Apple devices like the Apple TV 4K and iPad that support h.265 up to 4:4:4 for Sidecar/AirPlay reasons (to avoid smeary desktop mirroring). However they don't run Kodi easily, though a Kodi fork, MrMC does run. I've played 4:2:2 216p50 h.265 on the ATV 4K to test.)

The reason for the lack of 4:2:2 support?  There was no real consumer source for it - DVB, ISDB & ATSC broadcast/satellite/cable TV, SD DVDs, HD Blu-rays and UHD Blu-rays are all largely based around 4:2:0 chroma for consumer video, and most mobile phone video and consumer mirrorless/DSLR video uses 4:2:0 for consumer codecs.  

DVB can be used with 4:2:2 for broadcast uplinks back to TV stations - but they use non-consumer hardware to decode, and of course higher end cameras allow for higher quality video codecs, but these are aimed at post production workflows, not straight replay.