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Several audio channels for a video stream
The multi-channelling can be useful if you wish to broadcast a live video and several sound versions (like in the case of a meeting which would be translated live simultaneously in different languages). But there is no ready-existing solution unfortunately to define several soundtracks during a live video streaming.
You can however consider the 2 following solutions:
Pair the video streaming product to one or more audio streaming, and plan a page that will host your video player along with audio players, with buttons allowing the visitor to cut the sound of one of the streams and activate the sound of another...
Sign several video streaming contracts, and stream the same image with a different sound. In that case plan a sufficient bandwidth for all the streams that will be sent to us...