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Thread: changing aspect ratio, GOP size and frame rate

  1. #1

    Default changing GOP size , VBR

    Hi,

    I need to change the GOP size and capped VBR of an incoming stream.
    Is it possible with WOWZA? If so please let me know the configuration I need to do.

    GOP
    M frames
    N frames
    GOP mode
    closed GOp

    VBR
    Min rate
    Max rate

    Thanks
    Manoj
    Last edited by manojprasath; 07-08-2013 at 03:56 AM.

  2. #2

    Default

    Hi Manoj, you will need the Wowza Transcoder for this.

    You can set the bitrate and GOP, and create multiple renditions with different bitrates.

    Salvadore

  3. #3

    Default

    Hi Salvadore,

    I have the transcoder Addon too.
    But I cant find documentation on how to set GOP and variable bit rates.
    Could you please post me a link or a document?

    Thanks
    Manoj

  4. #4

    Default

    Manoj,

    These settings are located in the /transcoder/templates/transrate.xml and transcode.xml files.

    You can set frame size:
    <FrameSize>
    	<!-- letterbox, fit-width, fit-height, crop, stretch, match-source -->
    	<FitMode>fit-height</FitMode>
    	<Width>640</Width>
    	<Height>360</Height>
    	</FrameSize>
    Key Frame interval:
    <KeyFrameInterval>
    	<FollowSource>false</FollowSource>
    	<Interval>60</Interval>
    	</KeyFrameInterval>
    And StreamNameGroup for Variable bitrate:
    <StreamNameGroups>
       <!-- Note: Play stream using stream name ngrp:[stream-name] -->
          <StreamNameGroup>
          <Name>all</Name>
          <StreamName>${SourceStreamName}_all</StreamName>
          <Members>
    	<Member>
       <EncodeName>source</EncodeName>
    	</Member>
    	<Member>
    	     <EncodeName>720p</EncodeName>
    	</Member>
    	<Member>
    	     <EncodeName>360p</EncodeName>
    	</Member>
    	<Member>
    	     <EncodeName>240p</EncodeName>
    	</Member>
    	<Member>
    	    <EncodeName>160p</EncodeName>
    	</Member>
    	</Members>
    	</StreamNameGroup>
    <StreamNameGroup>
    For more information you can refer to the Transcoder User Guide

    Salvadore

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