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changed to HEVC and it worked but still you would think the deafault AMD would be supported.
No reason to really think that, but it would be nice if PD21 video support was modernized.
PD21 does not widely support many of the common newer technologies like AV1, 4:2:2 chroma subsampling, 10-bit color depth, VP9,..... so one simply has to convert source video or capture in supported formats if you'd like to edit in PD21 or switch to an editor that's attempting to stay current.
Jeff