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by m0dest 681 days ago
The state of the art here is really Parsec, Moonlight, and Apple's "High Performance Screen Sharing" [0]. All three of these use hardware-accelerated HEVC in some UDP encapsulation. Under the right network conditions, they achieve very crisp text, 4K60 4:4:4 with low latency.

[0]: https://support.apple.com/guide/mac-help/screen-sharing-type...
1 comments
ranger_danger 681 days ago
Are you suggesting that HEVC can adapt its compression for different regions of the same frame similar to JPEG-XL? I don't think this is possible but I would love to be proven wrong.
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m0dest 681 days ago
Yep, this is achieved using slices, which can be arbitrary regions of the frame. Each slice can have its own quantization parameters (ranging from highly lossy to perceptually lossless). Each slice can also switch between intraframe prediction (more like still image encoding) and interframe prediction (relative to prior frames).

So, with this, you can have high-quality static text in one region of the frame while there is lossy motion encoding (e.g. for an animating UI element) in another region of the frame.

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ranger_danger 681 days ago
Ok that's cool, I didn't know that. Did avc/h264 have this?
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