Support tee muxer with special command

[MaPePeR]

It would be great if there would be a special method to create a tee output, because, I would say, its one of those that are "not so pretty" to configure.

[jdbodyfelt]

Fully agree! I'm at a point where I need to record to mp4 and udp for playback and I see no other way than with a ffmpeg cmd string, but it would be MUCH nicer for my junior developers if tee was incorporated.

[tiagovrtr]

How would you use it right now? Could you pass tee=None to .ouput()?

[dror-weiss]

Has anyone managed to use tee with this lib?