Wowza Community

changing aspect ratio, GOP size and frame rate

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

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

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

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