Ffmpeg av1 to h2642/18/2023 The process is: Raw input pixels (8 or 10 bit) minus predicted pixels (8 or 10 bit) -> residual pixels (8 or 10 bit + 1 sign bit). The work is in finding a set of encoding parameters to measure the quality difference at the same output size, and to measure the relative improvement across CRF vs size vs bit depth. The larger file has a slightly higher VMAF score, as would be expected from spending more bits. ![]() I have a project in progress to measure all of the variations, but from quick testing with CRF encoding the same value results in much longer compute AND a larger file in 10-bit versus 8-bit. But if you start with an 8-bit encode you've already thrown away the extra precision, so why waste the (considerable) extra compute on 10-bit just to make sure you don't truncate the already-truncated YUV? The gist is that all 8-bit RGB values cannot be represented properly in 8-bit YUV420, so you're supposed to use 10-bit to get "proper" YUV values. I haven't seen this argued as 16-bit DCT, but in color space conversion. If you get better precision you need to keep those extra-precise bits that are no longer zero due to truncation. How is this possibly true? The argument that 16-bit DCT somehow gives better precision AND doesn't change the size of the encode makes no sense. exactly what software based, offline encoders are good at. ![]() ![]() The hardware based encoding is not equivalent to software one it is optimized for dumping compliant streams with low latency, it does not concern itself with effective use of the bits available. It also plugs seamlessly into linux multimedia framework (Gstreamer), so it is on the same level of integration, as Media Foundation codecs in Windows. Linux distributions and Firefox do provide H.264 support via openh264 it is sponsored by Cisco, who are already in the flat license territory, so all they have to do is track binary downloads (that's why they are separate download, or repository respectively). There is a very well hidden, free "from device manufacturer" version, so unless you know about it, you have nearby zero chance finding it. Windows 10 does not include a license for H.265 you have to purchase it separately.
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