DVDs panning really bad (jitter/judder?) best MPEG2 codec ?

Discussion in 'Codecs' started by savaino, July 3, 2009.

  1. savaino

    savaino Portal Member

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    Hi,
    When watching DVD (ripped to local SATA hard drive in native VOB format with no alteration) during scene panning the video stutters and playback in general is not as smooth as it should be and after a lot of tests/tries I'm out of ideas. My AVCHD in mp4 format home videos in full 1080i play smoothly as butter same for a bluray rip.....(in original m2ts format) here my configuration:

    HW:
    CPU: AMD BE2350
    Video: ATI: 3450
    MB: ASUS M2A-VM 4GB RAM

    SW:
    XP-SP3 32bit
    Mediaportal 1.02
    Codecs: Cyberlink PDVD8 hardware accelerated for both h264
    ATI 9.6 driver

    HW acceleration works very well for the AVCH files: both CPU and GPU load is quite low (<20%)
    With MPEG-2 DVD files (VOBs) the GPU load goes up to 60% while CPU is around 40% not sure why as load it should be even lower than h264 decoding ?

    Using (shift-1) I can see that for h264 dropped frames are basically 0 and jitter is also >5.
    For DVD dropped frames are in the hundreds and reported jitter is around 20 or more.

    I was almost going to update the entire system (CPU and GPU) but after seeing the HD content playing fine I'm not sure at this point if there is any other setting I need to play with....de-interlacing maybe ?



    Any suggestion on best MPEG2 decoder ? Preferably with hardware acceleration ?
    I tried SAF but HD is unwatchable and DVD quality did not change much. I disabled AMD Cool & Quit too.
    Any help on what to look next will be greatly appreciated as anyone willing to share any similar experience!
    --sav
     
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  3. hoborg

    hoborg Portal Pro

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    Check graphstudio when playing DVD under MP if cyberlink decoder is realy in use, make sure you have any "on-the-fly" DVD decoder installed.
     
  4. Owlsroost
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    The MPEG-2 CPU load will be higher because more of the decoding is done by the CPU - with H.264 most of the decoding is done by the GPU (in a dedicated hardware block, so it doesn't show up as GPU load). That said, your numbers look high for SD MPEG-2....

    Tony

    (You shouldn't need to tweak anything, but just in case there's a lot of stuff on tweaking ATi drivers etc on Home Theater Computers - AVS Forum - e.g. ATI Radeon HD 2X00 (2400,2600,2900) series owners thread - Page 68 - AVS Forum - but some of this is out of date with current drivers.)
     
  5. hoborg

    hoborg Portal Pro

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    Honestly, i newer have need to tweak anything.
    I an using Cybrerlink MPEG2 decoder (SAF) and on my HD3200, 4550 and 4770 newer have problem with it (LiveTV & DVD)

    Most common problems are
    -wrong GPU drivers (crashing,BSOD,freezes) - try Catalyst 9.4, i can confirm they are working OK
    -codec mess
    -selected decoder is not in use
    -EVR selected in XP
    -bad mpeg splitter
    -Cyberlink decoder not configured corectly (WMR9 not enabled)
    -GPU owerheating (crashing,BSOD,freezes)3
    -using subtitles + slow CPU (h.264 video only) - subtitles kill DXVA, fixed in MP 1.1.0 ALPHA
     
  6. pilehave
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    60% CPU does sound like a high number, I suggest you take the other posters advice and check with GraphStudio.
     
  7. savaino

    savaino Portal Member

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    HI thanks for the feedbacks
    I checked with graphstudio and the cyberlink codec is indeed used while the DVD movie is playing.
    It does not seem to be a difference if I enable subtitles or not (when playing DVD with embedded subtitles, does DVXA still works ? I understand it does not when you use an additional subtitle filter when playing for example avi+srt).
    I'll remove all the codecs (k-lite, pdvd) and install SAF+pdvd8 codec again and see how it goes.
    Any additional input/comment is welcome.
    --sav
     
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