I'm successfully streaming silent video with music added from my Raspberry Pi (Raspbian) to YouTube via ffmpeg, with the help of this GitHub gist and this post:
raspivid -o - -t 0 -vf -hf -w 1280 -h 720 -fps 25 -b 4000000 | \
ffmpeg -i music.wav \
-f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental \
-f flv rtmp://a.rtmp.youtube.com/live2/STREAMKEY
The last step of my project to add a transparent, full width/height png overlay to the video (1280x720 size in my case). I've seen a few related answers such as this one and this one.
With the added complexity of piping in a camera feed, mixing in an audio source and outputting to a video stream, I haven't succeeded in adding the image overlay. Where/how would I add a transparent image overlay in the example above?
The ffmpeg part will be
ffmpeg -i music.wav \
-f h264 -i - -i overlay.png
-filter_complex "[1][2]overlay"
-vcodec libx264 -preset ultrafast -tune zerolatency -acodec aac -ab 128k -g 50 -strict experimental \
-f flv rtmp://a.rtmp.youtube.com/live2/STREAMKEY
Since you're altering the video contents, copy can't be used, and the video has to be re-encoded.
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