Maybe the latest Premiere or After Effects on Windows with a Pascal GPU or something, so you get DXVA decode. I doubt you'd be able to get real mezz quality with x264 at less than 50% the bitrate of ProRes 4444.īut either way, you're losing compatibility with a whole lot of tools and workflows. H.264 would be quite a bit higher, as it isn't as efficient for 4k (only 8x8 blocks, while HEVC does up to 32x32) and no -cu-lossless, which actually can reduce bitrate by finding blocks that are small encoded losslessly that would be bigger as quantized lossy.
In my tests (getting on a year old), With medium-GOP I was able t get similar quality to ProRes 4444 at 25% the bitrate, and with IDR-only at about 40% the bitrate. Yeah, the compatibility hit is so bad you might as well use HEVC, which can be a lot more efficient for near-lossless mezzanine encoding. You might be better off using ProRes 4444 or DNxHR for this. Unless this is just for archival, you will probably have issues with compatibility.
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