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Thread: Latency and Video Quality Problem

  1. #1
    Join Date
    Dec 2011
    Posts
    11

    Default Latency and Video Quality Problem

    We have been using WMS 3 trial version for developing a video chat application, if we can succeed we are thinking to buy one.
    However, we are having problems about latency and the quality of the video.Our application will be a live video streaming application, it will be a video chat application.I tried your examples which comes with the trial version, I think I've done everything you suggested on the tutorials and on forum posts but quality is still low and there is a 4-5 sec latency even when I have <Streams><StreamType>live-lowlatency</StreamType>.What could be the reason?I tried JW player, OSMF player and created flash files to stream the video with your examples, and tried to use WireCast and FME for broadcasting but none solved my problem.
    Is there any idea you can give?

    Our server's properties are
    Windows Server 2008 R2 Enterprise, service Pack 1
    Processor : Intel(R) Xeon(R) CPU E5430 @2.66GHz 2.67 GHz
    Installed memory (RAM) : 2GB
    Quad Core

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

    Default

    For VideoChat you will have to use Flash RTMP client for publishing, not dedicated encoder like Wirecast.

    Take a look at this guide:
    http://www.wowza.com/forums/content....re-to-playback

    Richard

  3. #3
    Join Date
    Dec 2011
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    11

    Default

    Could you give me a direction with "Flash RTMP client"?
    I did not only try WireCast I also used the files shipped with Wowza's trial version,
    and I have already done all the things in the link you sent, nothing changes.

  4. #4
    Join Date
    Dec 2007
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    Default

    Wowza ships with a VideoChat example, in the examples folder where Wowza is installed. There is a Flash CS (with .fla file) version and Flex version (with .mxml file). These are not production ready applications, they only show what is essential about a Wowza/Flash chat application, with no features. They are meant as starting place or reference for developers

    This unofficial (Flex) example goes a little further:
    http://www.wowza.com/forums/showthre...V-Chat-example

    And here are several commercial Flash chat apps that work with Wowza:

    All 4 of these third party companies offer useful products with pre-built video chat environments.
    * ChatBlazer http://www.chatblazer.com/ (part of Pendulab)
    * Flashcoms http://www.flashcoms.com/
    * AVChat http://avchat.net
    * Cyberxess http://www.cyberxess.com/wms/login.php

    Richard

  5. #5
    Join Date
    Dec 2011
    Posts
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    Default

    Thank you so much Richard, I will try the example immediately.

  6. #6
    Join Date
    May 2011
    Posts
    456

    Default

    The latency is likely caused by the player buffering. Try adjusting those settings and reduce the player buffer to a really low value. Try .1 or zero.

    -Lisa

  7. #7
    Join Date
    Dec 2011
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    Lisa I do have something like this in my flex code
    // set the buffer time to zero since it is chat
    nsPublish.bufferTime = 0;
    , is that what you mean?(nsPublish is a netStream object)
    Last edited by emreVeriyaz; 02-29-2012 at 05:24 AM.

  8. #8
    Join Date
    Dec 2011
    Posts
    11

    Default

    Thank you, Richard and Lisa I finally reduced latency to nearly 0 with your helps.I have problems with quality but I am not sure
    if it is caused by the code.I guess quality of the camera, server capabilities and internet connection could also be effecting the quality of the video.
    Last edited by emreVeriyaz; 02-29-2012 at 09:10 AM.

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