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Thread: G711 audio works on flash (rtmp) but does not work with rtsp

  1. #1

    Default G711 audio works on flash (rtmp) but does not work with rtsp

    Hello,

    Our IP cameras have H.264 video + G.711 audio.
    We re-stream the video from wowza to clients. We use flash for web clients and rtsp for android clients.
    We have no problems listening to g.711 audio with the web clients using strobe flash player.
    However there is no audio in the rtsp stream.
    It looks like wowza strips audio stream from the rtsp streams while restreaming but does not do that for rtmp streams, is this correct?

    If yes is it possible to tell wowza not to do this? We want it to keep the audio track inside the rtsp stream while restreaming.
    Since it keeps the audio for the rtmp streams I hope that this might be possible.

    Note: we dont want to use wowza transcoder to convert audio to aac.

    Best Regards,
    Özgür

  2. #2

    Default

    G711 works in Flash 11+ without transcoder.
    Android devices do not support G711:
    Android Developers Website

    If your camera does not have support for another audio format you will need to use Wowza's Transcoder Addon.

    Salvadore

  3. #3

    Default

    Dear Salvadore,

    Thank you for your reply.
    We have imported the FFMPEG library to the Android platform.
    So our android application does supoort G.711 streams.
    We can get g.711 audio from our camera if we use the camera rtsp steram directly i.e. if we dont restream from wowza.
    But wowza just strips the g.711 track from the stream while restreaming. We have verified this using vlc as well.

    So is it possible to tell wowza not to discard the audio track from the rtsp stream?

    Özgür

  4. #4
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    You should be able to playback a stream with g.711 audio in Flash RTMP and Flash HTTP players. At present, g.711 is not packetized for RTSP clients and it doesn't work on HLS or HDS clients

    Richard

  5. #5

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    Dear Richard,

    Thank you for your reply.

    Is there any workaround for this?

    Can we tell wowza to just pass the stream as is without any processing?

    Or maybe can we write our own module module to packetize g.711? I assume this must be quite difficult.

    Can you give us advice on how to solve this problem without using wowza transcoder and without changing the camera?

    Best Regards,
    Özgür

  6. #6
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    Özgür,

    Yes, the Wowza Transcoder supports g.711 for decode. It will transcode the audio to AAC which will play in all supported clients.

    Richard

  7. #7

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    Dear Richard,

    I think I did not make myself clear.

    We dont want to use Wowza Transcoder because it is too expensive since it is billed per stream.

    Is there any workaround for this?
    Do you think it is possible for us to write our own packetizer module that packetizes G.711 audio for RTSP streams.
    We have a strong development team, I think we can do it if there is any documentation or samples etc.
    Or maybe we can hire professional services from wowza to do it for us?

    Can you please suggest how we should proceed.

    Best Regards,
    Ozgur

  8. #8
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    Ozgur,

    Without the Transcoder, Wowza just reflects streams. So this is a codec/player issue really, Wowza is just in between. You can try to do what you describe, but I don't have any example and would probably not be able to support that effort through Wowza free Support.

    Richard

  9. #9

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    Dear Richard,

    Thank you for your answer. I will just ask my last set of questions about this issue.

    Since you said wowza only reflects these streams, I wonder If misunderstood your last post.

    All I need is wowza to reflect the stream as is, without changing it.
    However it does not do this, it strips the g.711 audio from the stream.
    And the reason is that a g.711 packetizer for rtsp streams is not implemented. Is this correct?
    And there is no way to make wowza just reflect the stream without using its own packetizers. Is this also correct?

    And finally can we get any professional services from wowza to implement a g.711 paketizer fo this for us?

    Best Regards,
    Özgür Deniz Önür

  10. #10
    Join Date
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    Özgür,

    Right, Wowza only really reflects g.711 audio to Flash RTMP clients.

    Wowza does not provide professional service directly, but I will submit this as a request to backlog, which would be the best thing to do.

    Richard

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