Live TV *always* stutters audio and video at 30-32 seconds after pressing PLAY

Discussion in 'Television (MyTV frontend and TV-Server)' started by CanadianEh, February 10, 2012.

  1. CanadianEh

    CanadianEh Portal Pro

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    Good afternoon,

    I'm having an issue where no matter what tuner I use, or client PC I've tested, the video and audio ALWAYS stutter at the 30-32 second mark after pressing play on live TV and recorded video. I have verified by rewinding 15 seconds that the stutter is NOT in the source video, as it moves to 30 seconds after playback from a "rewind" or "fast forward" function, rather than sticking to the same point in the video file duration.

    I've also tried building a second TV server on separate hardware with the same boards (I have duplicates of my HD-PVRs and Hauppauge tuners) and have the same exact issue from that server. The original server is Windows XP 32-bit, while the new server is Windows 7 Professional - 64-bit.

    I've tried different audio and video codec combinations (SAV), and cannot get this issue to go away. The network between the client PC and server is 100Mb hard-wired (CAT5e).

    I've attached logs where this is present. If there is anything else I can provide, please let me know. I'm willing to try anything to resolve this issue.

    Help!!! :D


     
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  3. Owlsroost
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  4. CanadianEh

    CanadianEh Portal Pro

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    Hi Tony,

    Thank you for the reply! So, here are the answers to your questions:

    The first stutter seems to always be at 30 seconds.... after that, the next ones come later on randomly. The longer you watch live TV, the more frequent the stutter and pixelation issues occur (ie: the Superbowl was painful... lol)

    I just tested switching to UNC paths, and that seems to clear up the stuttering - at least within the first 2-3 minutes of a show (will need to do more testing). The weird thing is when starting to play a show, the screen ends up with a green tint, and video freezes. If I hit rewind once, it then plays the file (timeshift) fine.

    Any other suggestions?
     
  5. Owlsroost
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    I suspect the startup green tint/freeze problem is a decoder/video driver 'feature' - try using LAV video in software-only mode (the MS DTV decoder will be using DXVA i.e. the Intel GPU hardware decoder), or the 'noStopMod44' TsReader.ax from -> here <- which has different start-up behaviour to the standard version.

    Tony
     
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  6. CanadianEh

    CanadianEh Portal Pro

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    So, the TSReader.ax version 44 you suggest below actually seems to clear up the pause after playing video for 30 seconds. I currently have the following configs that seem to be working properly:

    - Client 1 - TSReader.ax V44 in non-RTSP mode
    - Client 2 - TSReader.ax V44 in RTSP (normal) mode

    I'll need to see if either combination resolves the stuttering that comes up after watching a long video stream, but so far, so good.

    Next question - the experimental "non-RTSP" mode: Will that be supported in future releases of MediaPortal, as well?

    :D
     
  7. Owlsroost
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    I don't know of any plan to remove it - it's been in MP for several years already :) (I think it's kept 'hidden' because it's more complex to set up, and to avoid confusing new users with too many options).

    Tony
     
  8. CanadianEh

    CanadianEh Portal Pro

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    Okay, cool. Last question - am I missing out on anything by using the UNC access method?
     
  9. CanadianEh

    CanadianEh Portal Pro

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    So, I still experienced some random stuttering using the UNC method, so I dropped back to the regular RTSP method with the V44 TSReader.ax file. I no longer see the 30 second stutter in this config!! :)

    However, I'm still experiencing very infrequent issues, which I would describe as something like a 20ms 'pause'. During the pause, both audio and video frames are dropped. As the pause 'resumes', video and audio continues at the point in time where it should be.

    I will try to see if I can capture this behavior when I have time - but am curious if others see this same, random behavior?
     
  10. Paranoid Delusion
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    Try using the dpc latency tool, that will at least show if system lag by a bad driver could be the culprit.
     
  11. CanadianEh

    CanadianEh Portal Pro

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    Hi Ray,

    Unfortunately, that utility didn't find anything unusual. I've kind of ran out of ideas on how to resolve this.
     
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