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Thread: Issues with default installation (green screens)

  1. #1
    Join Date
    Feb 2014
    Posts
    10

    Default Issues with default installation (green screens)

    Dear community and / or Wowza staff,

    We have been using Adobe FMS for streaming, nobody complained about the streaming. Now we are using Wowza streaming and we have a couple of people complaining about "green screens" when fast forwarding a stream. How do I troubleshoot this issue without returning to Adobe FMS? I need a fix fast, because these people are complaining

    Kind regards, John

  2. #2

    Default

    Hi John,
    Currently, trickplay (fast forward, fast rewind, slow motion) in Wowza, only works with VP6 or Spark based content in Adobe Flash.
    You can use the FastPlayVideoStreaming package which includes support this functionality.
    How to configure trickplay for Flash VP6 or Spark content

    Salvadore

  3. #3
    Join Date
    Feb 2014
    Posts
    10

    Default

    Thanks for your reaction. However I don't think they really use "fast forward, rewind". What I meant was that they click further in the progress bar to zap to 1 minute for example. Does that make sense? :-)

  4. #4

    Default

    Okay, so you mean when seeking.

    Can you explain your set up?
    What is the key frame interval?
    What are the video and audio codecs?
    What players are experiencing this issue?
    Is the issue only on a certain stream? or on multiple streams?
    Is it pretty consistent or sporadic when this happens?
    Are you doing adaptive bitrate streaming?

    It could be that the key frame interval is to high. For seek to work, Wowza needs a key frame every 10 seconds. You can increase Wowza key frame tolerance by adding the following property to the MediaReader/Properties section in [install-dir]/conf/[application]/Application.xml. It looks like this:
    <MediaReader>
    	<Properties>
    		<Property>
    			<Name>seekKeyFrameSearchWindow</Name>
    			<Value>40000</Value>
    			<Type>Integer</Type>
    		</Property>
    	</Properties>
    </MediaReader>
    Another suggestion is to try adding seekTarget Property to the Application.xml /Streams /Properties list set to "enhanced":
    <Property>
    <Name>seekTarget</Name>
    <!-- valid values are: videoKeyFrame, audio, enhanced. DEFAULT = videoKeyFrame -->
    <Value>enhanced</Value>
    </Property>
    If you determine you need to re-encode the files you can use this guide:
    How to encode video on demand content

    Salvadore

  5. #5
    Join Date
    Feb 2014
    Posts
    10

    Default

    Salvadore you are a genius! This fixed it:

    <Property>
    <Name>seekTarget</Name>
    <!-- valid values are: videoKeyFrame, audio, enhanced. DEFAULT = videoKeyFrame -->
    <Value>enhanced</Value>
    </Property>
    Thank you very much!

  6. #6

    Default

    That's great! Thanks for the update and I am glad I could help.

    Salvadore

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