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Thread: Transcoder Issues - Jerky video/Low Frame Rates

  1. #1

    Default Transcoder Issues - Jerky video/Low Frame Rates

    Hi there,

    I've just setup an EC2 instance with a Wowza AMI v4.0.1 (as suggested on the guides) and am sending a 5mbps stream from Wirecast to transrate with the Transcoder AddOn to 4 different bitrates.

    When I first streamed, I noticed in the logs it had defaulted to to weird frame rate so used the sourceStreamFrameRate property to set this at 25 and all seemed ok after a restart.

    However, after maybe 5-10 mins the transcoded video looks jerky like it's around half the frame rate. I've check this on iOS devices, my own JW Player and the built in Wowza test players and they all confirm my Wirecast encoded incoming stream looks clean, just the Transcoder output does not.

    CPU usage on the c1.xlarge doesn't get much past 20%.

    Could anyone take a look at this in the support department at Wowza?

    Last edited by alexmay; 04-24-2014 at 03:12 AM.

  2. #2
    Join Date
    May 2013


    Please refer to ticket #89359 moving forward.

  3. #3


    Hi All,

    After some quick work by Matt here my issue seemed to be caused by Wirecast's x264 codec. Using the h264 codec solved this.


  4. #4


    Was this resolved with Wirecast 5.0.3?

  5. #5


    I was using 5.0.3 when this issue occured.

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