At quality 6, I can encode faster than real-time on my AMD Ryzen 9 3900X 12-Core Processor. You can encode a 4K, 100-minute video down to about 1.2GB at pretty impressive quality.
The biggest challenge, I imagine, will be to make sure the correct bit depth, HDR flags, and color characteristics in the video get embedded in and encoded correctly, but perhaps Video Converter already does that separately

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