Feature request: split frame encoding for NVENC

[PmNz8]

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Feature Request

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Hi all!

Some of the RTX 4000 GPUs support two-way split frame encoding, RTX 5090 supports 3-way split frame encoding. Basically, when having multiple hardware NVENC engines, the encoder can encode one frame in parallel accelerating the encoding and increasing throughput. Great help for high refresh, high resolution streaming. Or allowing to set higher quality profile while offsetting the encoding slowdown caused by it.

There was some work inside this PR but it seems to be abandoned: LizardByte/Sunshine#3061

Would be great. From what I know some AMD GPUs also support split encoding, so maybe it could be added as well.

Thanks!