[RBO2]

I think they're almost there in two ways. 1) is https://github.com/gpac/gpac/issues/790. 2) is to extend FFmpeg to include the MP4Box muxer: http://www.gpac-licensing.com/signals/

[spython]

Thanks for the links. Yes, the gpac dev version is close to have a working solution - https://github.com/gpac/gpac/issues/772

Not quite sure what the signals project strives to be. Is it a framework for commercial applications built on top of gpac?