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Thread: Separate H.264 and audio capture

  1. #1
    Join Date
    Dec 2012
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    4

    Default Separate H.264 and audio capture

    Hi Guys,

    I'm not a wowza developer and haven't programmed in quite a few years so you'll have to forgive my naivety. I am a systems design engineer specialising in audiovisual & ICT and I am currently designing the technology systems for a state of the art teaching campus.

    I am trying to design an IP based video network and I am stuck on one last and critical detail that I hope someone can provide me with an answer on.

    We have in the design many Axis IP cameras in technical workshops around the campus, for various reasons it is neigh on impossible to run an audio feed from the microphone base station to the cameras located 4 metres above the ground many metres away (there is no physical pathway for the cabling for starters!). I would like to use an Axis audio encoder and the record both the camera H.264 and audio stream as one file on the wowza platform, but as they are separate and will come from different IP addresses, I am not confident that this is possible.

    The other aspect is that in some areas there are 2 cameras between one audio encoder, so the backend needs to differentiate which camera goes with the audio stream but I know this can be managed programmatically.

    Can some please enlighten me on whether or not this concept is possible and if so, are there any modules that will I need to know about in documenting the design. The project would be completed using Wowza 3.5.

    Thanks!
    meth0d.

  2. #2
    Join Date
    Dec 2012
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    4

    Default

    From the user guide:

    Transcode: Ingests a non-H.264 video and non-AAC/MP3 audio media stream and
    converts it to a set of H.263 or H.264 AAC adaptive bitrate media streams with
    properly aligned key frames.
    The camera is H.264 AVC High Profile Part 10 and the audio is AAC but what I still can't figure out is whether or not Wowza requires the audio/video stream to arrive at the server from the same source or if it can be configured to transcode seperate sources together in to the one H.264 output.

  3. #3
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    It has to be the same source. There is not a practical way to combine sources

    Richard

  4. #4
    Join Date
    Dec 2012
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    Default

    Quote Originally Posted by rrlanham View Post
    It has to be the same source. There is not a practical way to combine sources

    Richard
    Couldn't the two separate streams be combined as separate NetStream objects in the one NetConnection?

  5. #5
    Join Date
    Dec 2012
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    Ok I've dug and dug and it doesn't seem possible without introducing ffmpeg as a pre stage to the wowzer for live muxing - which would create too much complexity/latency. What I will have to do is install a wireless microphone receiver at every camera, connecting the audio direct to each camera then group physical locations on the same mic frequency, e.g. workshops 1 & 2 on frequency A, a wireless mic transmitter on frequency A shared between both workshops so the user can roam and simply switch the camera source being recorded via a web based interface.

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