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Thread: Doubt about PassThru on Wowza Transcoder Add-On

  1. #1

    Question Doubt about PassThru on Wowza Transcoder Add-On


    I'm successfully using Wowza Transcoder Add-On, but I do have a doubt about the PassThru parameter.

    Here is the thing: I'm using Adobe Flash Media Live Encoder to stream an H.264 video with MP3 audio, and want Wowza to tranrate the video (to several bitrates) and transcode the audio to AAC.

    Since I'm already providing an H.264 video input, I understand I should set <Codec>PassThru</Codec> on the <Video> section of the Transcoding template I'm using.

    However, when I do so, any video "changes" I apply (bitrate, profile, overlay) simply do not occur. For example, if my original video has 500 kbps and I want to output 300 Kbps and 100 Kbps streams, they simply will not happen if I have PassThru. In fact, although those stream "exist", they simply carry the "original video at 500 Kbps". So no actual "transrating" occurs. It only occurs if I set the Codec to H.264.

    My question is: what am I missing here? When I have an input video at H.264 and want to transrate it (and transcode its audio), should or should I not use PassThru?

    Thanks in advance!

    Helder Conde

  2. #2



    The passthrough parameter just allows a new stream to be created from the input, name change, but does not alter any of the video/audio if used. If you do want to alter it then you do need to specify the H264 codec so the video processing occurs.


  3. #3

    Smile Thanks!

    Got it! Makes sense!


    Helder Conde

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