[6.0] Add CUDA transpose/flip filters

[nyanmisaka]

Changes

• Add CUDA transpose/flip filter impl
• Add flip feat to OpenCL transpose filter
• Sync RKRGA filter fixes from ffmpeg-rockchip
• Fix libplacebo compat with the latest api
• Update 10-bit support for AMF AV1 encoder
• Update dependencies
• Bump version to 6.0.1-4

[Shadowghost]

How are these kind of filters not part of upstream FFmpeg?

[gnattu]

When will these filters be used? If we want the same functionality for macOS, we need to backport vf_transpose_vt as well. This filter performs both transpose and flip operations using VTPixelRotationSession, but it is only available on macOS 13+. This is newer than our targeted supported platform, macOS 12. The official projected end-of-life date for macOS 12 would be around October-November this year when the next major version of macOS is out, and we still have a few months to support it.

[gnattu]

It seems like we need to find some fallback path if our target is macOS 12:

gnattu@IntelMontereyVM Downloads % ./ffmpeg -version
dyld[555]: Symbol not found: (_VTPixelRotationSessionCreate)
  Referenced from: '/Users/gnattu/Downloads/ffmpeg'
  Expected in: '/System/Library/Frameworks/VideoToolbox.framework/Versions/A/VideoToolbox'
zsh: abort      ./ffmpeg -version

The binary uses VTPixelRotationSessionCreate cannot even be loaded on macOS 12, so we have to either make a build dedicated for macOS 12, or we use the fallback path for all platforms for now.

What functions are we needed? Only the flip or do we need the full transpose?

[nyanmisaka]

We are in no rush to fully enable it in 10.9 right away. You can optionally add this filter for higher version systems. I expect we will use the filer for 90,-90,180,-180 degrees. Therefore we need clock, cclock, reversal(flip) and even more.

[nyanmisaka]

How are these kind of filters not part of upstream FFmpeg?

There are no plans upstream to port commonly used software filters to hardware filters. They need to wait for contributors or bounty it as a GSoC project.

[gnattu]

I ported the transpose filter to CoreImage, and the code is published in this branch: transpose_vt_fallback.

This ported filter has the same name and supports all options of the upstream transpose_vt filter. Therefore, we do not have to change our server's code when we move to the upstream implementation and drop macOS 12 support later this year.