I wanted something to test vp23 build 278 decoding on an Nvidia 5080. So I fired up ffmpeg to transcode the original RedCar footage which was Sony HD422 Interlaced 50 mbps MXF media for transcode to progressive HD av1 and hevc422.

Much to my surprise, I wasn't able to get the ffmpeg hevc Nvidia codec to create hevc HD 422 10-bit... it kept on saying that was an unsupported Nvidia pixel format and changed it to 444 16-bit. Maybe there's a trick I'm missing. But I was able to use ffmpeg to create that format with either an Arc gpu or x265 by cpu. But no luck getting vp23 to decode hevc422 if the 5080 or an Arc was selected in i/o... had to disable the decoder gpu. In which case the cpu was used by vp23 instead. Cpu was automatically used if I tried the same thing with a 4090 selected in i/o... vp22 was the same.

I had better luck with ffmpeg using the 5080, Arc, or svt codecs to transcode to av1. That worked well enough but always gave me 420 av1. I don't know if 422 av1 is even a thing. But I haven't tried the original really clunky aom codec yet. Vp23 decodes av1 with the 5080 showing gpu activity in Task Manager, but RedCar performance isn't that great... not even close to the original Sony HD422 MXF performance which I believe was an mp2 format.

If anyone wants to try these on their own systems, they are in a 4gb zip here:
https://drive.google.com/file/d/1DxGwH_edbVx3cPF56sOvYtXJVwb_l55m/view?usp=sharing

Other media-versions of RedCar such as the original, ProRes and hevc420 are linked in my profile. The original Vegas project is identical in each with nothing but media substitution.