Decode AAC and MP3 mono audio to stereo with the Transcoder in Wowza Streaming ENgine

In some streaming scenarios, the source audio stream might switch between stereo and mono. In Wowza Streaming Engine™ media server software, the Transcoder by default assumes that the number of audio channels doesn't change during a transcoding session. However, you can add a parameter to a Transcoder template to instruct Transcoder to force any mono audio frames to stereo by duplicating the mono stream for both the left and right channels.

Note: Wowza Streaming Engine™ 4.5.0.01 or later is required.

To enable this feature in a Transcoder template, add the following section to the <Decode> block of the template:

<Audio>
    <Parameters>
        <Parameter>
            <Name>default.scaleChannels</Name>
            <Value>2</Value>
            <Type>Long</Type>
        </Parameter>
    </Parameters>
</Audio>