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Thread: The state of live streaming and multiple audio tracks

  1. #1
    Join Date
    Nov 2012
    Posts
    103

    Default The state of live streaming and multiple audio tracks

    We have a project where will get embedded HD-SDI with eight embedded audio tracks. Each audio track is a different language.

    The capture card and the software is able to recognize all eight audio tracks from the HD-SDI signal.



    Does this mean that I can ingest a single stream to Wowza containing a single video feed with eight audio tracks?

    Creating eight individual streams works but has two negative effects, namely stressing the encoder with eight video encodings (the video is the same, but has to be encoded eight times anyway) and taking up eight times the bandwidth of a single stream.

    8 x 1000 Kbps video
    8 x 64 Kbps mono AAC
    Total 8512 Kbps

    If it possible to send a single stream to Wowza containing all eight audio tracks, we could lower the bandwidth substantially:

    1 x 1000 Kbps video
    8 x 64 Kbps mono AAC
    Total 1512 Kbps

    Any thoughts on this?
    Last edited by niemion; 02-27-2015 at 03:38 AM.

  2. #2
    Join Date
    Jan 2015
    Posts
    357

    Default

    Hi niemon,

    Wowza can ingest a single stream with multiple tracks, but only if the source is MPEG-TS and there are multiple audio pids. You could also opt to create 1 video and 8 audio as separate streams, and then use a multitrack SMIL file to playback into a single stream.

    An article to use multiple tracks for HLS.


    Michelle

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