I haven't looked in detail, but this doesn't seem like a good idea to me. For example it can't handle having different encoders using different cards/hardware. I don't know what other options there might be, maybe this is the best, but it seems not particularly good.
The only other option would be to assume it's always only NV12, which is true for all hardware currently in existence. Unfortunately it needs a full CUDA and NVENC init to query the supported formats.
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