Hello everyone. I was in the need for ffmpeg to output directly to JACK, which is not supported upstream. (It has JACK input support, as in recording something from JACK and feed it to something else, but not the other way around) After trying a couple of methods that didn't work so great, like fifos or bridging through alsa loopback, I just went ahead and implemented this part in FFmpeg. You can find the relevant code at https://github.com/falkTX/FFmpeg/tree/n4.4-jackoutdev Not yet submitted upstream, still doing some testing. If this is something useful for you, feedback / comments on the code is very welcome. The relevant part sits at this file https://github.com/falkTX/FFmpeg/blob/n4.4-jackoutdev/libavdevice/jack_enc.c Have a great weekend!