SOLVED: AV1 transcoding using QSV doesn't work?

[seemebreakthis]

What CPU do you have?  Only 11th Gen Intel CPUs and newer can decode AV1 with Quick Sync.  And Intel Arc.  If you have an older Intel CPU you need to UNCHECK AV1 in Dashboard > Playback so that it uses the CPU to decode the video.

Thanks.  This explains it.

I did a quick check and my shoddy Synology DS220+ runs on a gen 9 UHD Graphics 600.

Thanks for pointing this out.