Some new multimedia loading/saving nodes (pyav-based)

[fat-tire]

As a personal learning project, I created two lightweight (<200 line) media nodes based on pyav, which is a Pythonic low-level binding for ffmpeg.

ComfyUI Unified Media Suite

It's meant to Load Media ⤴️ and Save Media ⤵️ -- video, audio, single image files, etc. -- as streams to/from ffmpeg-supported formats/containers/codecs. HW-optimized codecs are supported too. Other nodes may do similar things, but as I haven't tried them (yet), I can't compare really.

These nodes have been "lightly-tested" on x86_64 ubuntu w/cuda by one person (me) for a few weeks, and not w/any other setup, so at this stage, there are surely bugs. I tried to document how it "works" (as far as it does) in the code and README.

The UI is basic-- it should be possible to add an upload button (I think I might need a /upload/media endpoint (?)), preview videos, or filter the pix_fmt list on-the-fly as pyav provides that, but I haven't looked into how that stuff works yet. If anyone's good with .js or knows more, please hit me up.

GPLv3. PRs encouraged. Install instructions in the README.

Cheers!

(there's also a Merge Media 🔀 node)