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I see you are invoking Ffmpeg via the shell. I also tried steaming to Youtube from Go and had to resort to the same solution. It's a shame there isn't a usable library for implementing a RTMP client in Go. Using Ffmpeg from the shell is very limiting because there is no way to monitor the status of the stream or to provide audio and video separately using stdin.

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Couldn't you use named pipes for passing separate streams of input?

I tried doing that, but I ran into some performance problems due to streaming raw video. Instead I streamed the audio via stdin and created a HTTP MJPEG server listening on localhost and pointed ffmpeg there. I was limited to maybe 10 FPS top and the JPEG encoding overhead was also getting noticeable, but I limited the framerate to 1 per second because it was mostly static (song name and current/remaining time of the track).

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