Strange sound lag when watching SD-Videos

Discussion in 'General Support' started by Felias, October 20, 2008.

  1. Felias

    Felias Portal Pro

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    Hi there,

    since a few days, i've encoutered a strange issue with my MP-HTPC. I am streaming my media files from an ubuntu-server, and i am playing SD and HD-Files. The HD-Files are working as a charm, even 1080p-material (mkv) runs smoothly and in sync.

    When playing SD though, the sound has a severe laag (~1sec or more) compared to the video stream. I've encoutered this with all DivX, Xvid or similar material.

    As HD uses a much higher tranfer rate, i think i can substract the lan performance from the list of possible causes. FFDshow has always worked fine for me. I've tried the other available drivers, but no luck with them.



    Do you have any tip where the problem might be located? If you need more information please let me know. But as HD works fine, i guess several causes can be killed...

    MediaPortal Version: 1.0 RC3
    MediaPortal Skin: AEON
    Windows Version: XP Professional
    CPU Type: Athlon X2 3000+
    HDD: 20 GB
    Memory: 4 GB
    Motherboard: Gigabyte 780g
    Video Card: Onboard
    Video Card Driver: Latest
    MPEG2 Video Codec: ffdshow
    MPEG2 Audio Codec: ffdshow
    h.264 Video Codec: coreAVC
    TV - HTPC Connection: HDMI

    Thanks a lot in advance,
    Felias
     
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  3. Felias

    Felias Portal Pro

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    Ideas would be heavily treasured ;-)
     
  4. Slurm
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    Slurm MP Donator

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    I've had the same problem.

    First I disabled all features in ffdshow (resizing, avisynth, whatever was there) to be sure it's definitly no performance problem. This didn't help.

    Then I played around with the settings in Mediaportal and tried different codecs. All had the same audio lag.

    In the end I "solved" the problem by using reclock as audio renderer and ac3filter as audio codec. Now I have lip sync playback.
     
  5. Felias

    Felias Portal Pro

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    Slurm:

    Thanks for the tip, this really sounds exactly like the situation over here. I'll try this "hack" tonight. Not the nicest solution, but if it works i am fine with it.
     
  6. Paranoid Delusion
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    Any sound problems i have seen posted here on the forum, have been down to the driver or codec, reinstalling either or both has solved this for users in the past, oh there where 2 unusual cases, where the users had managed to activate the sound part in their ATI video driver software, that was a real twat to solve, because neither user remembered doing it, and who associates audio problems with video driver.
     
  7. Slurm
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    Slurm MP Donator

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    As I've read many posts which recommend the same, I reinstalled audio and video drivers and the used codecs, but it made no difference.

    I've also looked at the codecs with filmerit and there were no errors. Even reinstalling MP didn't help.

    Do you have any other hints to find out where the reason for audio-video sync problems lies?
     
  8. Paranoid Delusion
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    The only other link is DirectX, which if its foobar, even installing the latest August 2008 update may not repair.

    Just sometimes you have to start over and reinstall a clean OS to work from.

    That kind of comment i don't give lightly, but sometimes it really is necessary when all else fails :(
     
  9. Slurm
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    Yes, that would be really the last thing to do as I have a lot of other programs installed and it would take a long time to get the system in the state it is now.
     
  10. Paranoid Delusion
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    Same boat, so know the feeling, have had to do it twice since Vista came out, that's my problem i enjoy trying other software, even if it does screw up my existing setup :(
     
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