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Thread: Multibitrate HTTP Live Streaming on Android 3+

  1. #1
    Join Date
    Sep 2012
    Posts
    3

    Default Multibitrate HTTP Live Streaming on Android 3+

    Hello there,

    we are currently trying to move to HLS for modern Android devices. We are using multi bitrate switching with 4 bitrates (CupertinoPacketizer).

    The problem that we face is that the sequence numbers differ between the formats, and Android devices fail to switch to a different bitrate, if they can't find the same sequence numbers in the target file.

    Our encoders are set to a keyframe interval of 2 seconds and the chunk size is set to 6 seconds.

    The video is transfered using rtsp between the encoders and the wowza servers. So it's possible that a packet is lost or other problems occur.

    We already know about the solution here. But we would prefer a solution, that only resets the packetizer or sequence numbers instead of all streams, so rtmp streams to clients are not interfered.

    Greetings,
    Alex

  2. #2
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    Alex,

    Each stream has to be key frame aligned with each other. You can see if that is happening by enabling this debug Property:

    http://www.wowza.com/forums/content....rame-alignment

    Richard

  3. #3
    Join Date
    Sep 2012
    Posts
    3

    Default

    Just a followup on this. We fixed it for ourself now, by writing a module that checks all sequence numbers and restarts the streams, if they differ too much.

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