Video/Audio sync problems after TV start or channel change (1 Viewer)

Owlsroost

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  • October 28, 2008
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    TV-Server Version: 1.0 SVN 21688 'disaster123' modified version
    MediaPortal Version: 1.0 SVN 21688 'disaster123' modified version
    MediaPortal Skin: Blue 3 wide
    Windows Version: Vista Home Basic SP1
    CPU Type: Intel E4500, 2.2GHz
    HDD: 500GB
    Memory: 2GB
    Motherboard: Dell Vostro 200SL
    Video Card: XFX 9500GT low-profile
    Video Card Driver: 181.20
    Sound Card: Creative SoundBlaster Audigy SE
    Sound Card AC3: Creative SoundBlaster Audigy SE
    Sound Card Driver: P17X_PCDVT_LB_1_04_0079
    1. TV Card: Kworld DVB-T 399U
    1. TV Card Type: DVB-T
    1. TV Card Driver: V8.4.28.1
    2. TV Card:
    2. TV Card Type:
    2. TV Card Driver:
    3. TV Card:
    3. TV Card Type:
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    4. TV Card:
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    4. TV Card Driver:
    MPEG2 Video Codec: PDVD7
    MPEG2 Audio Codec: FFDShow (rev2653) (libavcodec)
    h.264 Video Codec: MPC-HC
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    TV: Panasonic TX37LZD80 @ 1920x1080p
    TV - HTPC Connection: DVI -> HDMI

    Hi,

    Almost always after starting live TV or following a channel change the video and audio will be out-of-sync. The problem sometimes also happens when playing recorded TV files. This is all SD DVB-T (UK Freeview), so MPEG-2 video/Layer 2 audio.

    A reliable workaround/fix for the problem is to skip forward (using the right arrow key) to the end of the timeshift buffer - this puts the video and audio back in sync (and they then stay in sync until the next channel change).

    The problem doesn't happen with other video and DVD playback - it seems to happen only when the 'tsreader.ax' filter is used to read the files, and then only when playback is first started i.e. it appears to be a stream startup problem involving 'tsreader.ax'.

    I assume that the 'skip forward' workaround forces the streams to be re-synchronised - maybe since the filtergraph is running at this point the filter latencies are known and can be compensated for more easily ?

    I've tried various codec combinations, but although this can change the exact behaviour, it doesn't fix it.

    Anyone else have (or had) the problem ?

    Tony
     

    Owlsroost

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  • October 28, 2008
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    Update

    OK, I've updated to the latest 'disaster123' MP version - no real change except that the problem now occurs almost every time after a channel change. It's usually in-sync when TV is first turned on. Again skipping to the end of the timeshift file fixes the problem (until the next channel change).

    One thing I have noticed is that after a 'skip forward to end' operation, it actually replays the last few seconds of TV i.e. it's actually skipping back a few seconds from the end of the timeshift file.

    I've attached log files for a simple sequence of:

    start MP -> turn on TV (vid+aud in sync) -> switch channel ((vid+aud not in sync) -> skip forward to end (vid+aud now in sync) -> stop TV -> close MP

    It's single-seat setup, using the 'MS loopback adaptor' as the network connection (to avoid the unreliable WLAN issues).

    Any suggestions ?

    Tony
     

    lordarcane

    Portal Pro
    November 3, 2008
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    I have the same problem when watching "live tv". A pause and unpause solves it. It occures after channel change. I have no problem when watching movies from hardrive. I have tried ffdshow, arcsoft and the mpv/mpa codecs in different combinations. No difference. I´m running MP 1.0 both tvserver and MP.

    I should add that I have tried both vmr9 and EVR.

    TV-Server Version: 1.0
    MediaPortal Version: 1.0
    MediaPortal Skin: Black & White 1080
    Windows Version: Xp SP3
    CPU Type: Intel 8200, 2.66GHz
    HDD: 320
    Memory: 2GB
    Motherboard: P5kVM
    Video Card: ATI 4550
    Video Card Driver: 181.20
    Sound Card: Terratec Aureon
    Sound Card AC3: Terratec Aureon
    Sound Card Driver: Google code driver by Dogbert
    1. TV Card: Azurewave AD-tp300
    1. TV Card Type: DVB-T
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    3. TV Card:
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    4. TV Card:
    4. TV Card Type:
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    MPEG2 Video Codec: Several (arcsoft, ffdshow, mpv
    MPEG2 Audio Codec: Several (arcsoft, ffdshow, mpa
     

    dhasselqvist

    Member
    November 20, 2007
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    I also had the exact same behaviour and tried different codecs only to find out that nothing helped. Then I realised that I had installed ReClock filter. After uninstalling ReClock the problem has never occured again with any codec combination. ReClock was, at least on my 2 systems, the cause of the sync problems after channel change.
     

    lordarcane

    Portal Pro
    November 3, 2008
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    I have indeed reclock installed. Though, I have not enabled it as default renderer in mediaportal TV settings. I have it as default rendered to videos though. But, maybe it interfiers in somewhay anyhow. I will try to unistall it to see what happens! Thanks for the feedback!
     

    lordarcane

    Portal Pro
    November 3, 2008
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    I can confirim that uninstalling ReClock fixed my problem with audio/video out of sync when changing channel, Now, everything is in perfect sync! MediaPortal FTW!!! And, thank you dhasselqvist for the tip!
     

    riadmelb

    Portal Pro
    July 9, 2006
    218
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    Melbourne
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    I'm gonna bring this 1 year old post back to life!

    I have ReClock installed but only enalbed for the video section.

    The problem is that I really need ReClock to sync my 23.976fps movies, so I don't want to uninstall it.

    Just out of curiosity, why do you think this is happening? Is it a ReClock bug?

    Thanks,
    Riado
     

    pickard

    MP Donator
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  • September 30, 2007
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    I Had the same issue and i solved it.

    1. first try to get coreavc codec and install it.
    2.then set coreavc in the video post processing .
    3. set tv codec h264 to use core avc.

    this should solve the sync problem.

    Tzach
     

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