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averne_

There are OpenGL extensions which can import a provided GPU buffer as a texture, using those you can achieve zero-copy.

For instance, with VAAPI->OpenGL you would use vaExportSurfaceHandle in conjunction with glEGLImageTargetTexture2DOES.

Check out the "hwdec" mechanism in MPV:

https://github.com/mpv-player/mpv/blob/master/video/out/hwde...

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Sure. I think the part that’s missing is that FFMPEG runs out of process and doesn’t deal in GPU buffers/textures.

If you use ffmpeg’s libavcodec interface then you can get it to give you the decoded framebuffers as exported DRM-prime descriptors which you can turn into textures. This is how Firefox does video decode with VAAPI, using libavcodec as a wrapper.

Edit: missed the part about JS ecosystem. You can move DRM prime descriptors between processes, but I assume you can’t do this from the ffmpeg CLI and would need to write your own little C wrapper around libavcodec

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