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Thread: Stuttering when starting playback

  1. #1
    Join Date
    Dec 2003
    Location
    Netherlands
    Posts
    351
    Hi,
    When I start playing a file, in particular one I've edited (using PVAstrumento and cuttermaran), the start of the playback is stuttery. After a few seconds everything is fine. When playing back in for instance media player classic there is no problem whatsoever, so the file must be OK.

    Any clues? Is it a pvr350-thing?
    Greetz,
    MaBo
    ASUS pundit, pvr 350, celeron 2600, 512 MB, 160GB HD, winXP Pro, 12" touchscreen

  2. #2
    Join Date
    Oct 2004
    Location
    Sweden
    Posts
    3,129
    Same thing for me (also pvr-350 user), but I've always considered it a non issue ;-) Btw, I have yet to edit a file and watch it through gbpvr, so I can't say if it gets worse or better after editing a file...
    I'm not always right
    GB-PVR 1.2.9
    Accent HT-400 Case, AMD Athlon 64 3800+ 1024MB, 1TB+300GB+180GB, WinXP Pro-SP2, NVidia 7600GT
    Nova-T USB2, PVR-350 recording from Dilog 355 DVB-T box, USB-UIRT (receiving & transmitting)

  3. #3
    Join Date
    Jan 2005
    Location
    Maryland
    Posts
    1,795
    I get that w/ file starts watching timeshift TV (so warching mpg file). It chugs a little for <15sec, mostly just a jog or two.

  4. #4


    I also have a 350 and experience the same issue.

  5. #5
    Join Date
    Nov 2003
    Location
    NextPVR HQ, Wellington, New Zealand
    Posts
    76,316
    On the PVR350, this is caused by the playback position of the file bumping into the record position of the file. Try increasing the live tv pre-play delay, which effectively starts things with a bigger gap between the two.

    Start with a big number then decrease it to find something that works well for you.

  6. #6
    Join Date
    Dec 2003
    Location
    Netherlands
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    351
    Sub,
    Thanks for the tip. I went up to 2500ms but nothing changed in the stuttering. What did change was a long time a black screen before playback started. Probably about 2.5 seconds ;-)

    That annoyed me just as much, so I went back to 300 ms.

    Greetz,
    MaBo
    ASUS pundit, pvr 350, celeron 2600, 512 MB, 160GB HD, winXP Pro, 12" touchscreen

  7. #7
    Join Date
    Jan 2005
    Location
    basingstoke, Hampshire England
    Posts
    338
    Hi. I have seen that you have a 160GB HD in your profile. When you run "defrag c: -a -v" is there much fragmentation? If you FTP a large file to the system does windows take a long time to write it? What does taskmgr say when you kick off a recording? Does CPU go 100% on the SYSTEM service?

    Lots of things it could be. Try knocking the quality down a notch and see what that does. I see you have an ASus Pundit. Could be that its IO bound becuase the disk is fragmented or you have a CDROM on the same channel that forced PIO mode 4 and not Ultra DMA. Have a play and get back
    Asus A7V880 Motherboard
    AMD Sempron 2400+ 1.67GHz (Socket A) CPU
    Maxtor DiamondMax Plus 10 200GB SATA 8MB Cache
    Maxtor DiamondMax Plus 10 160GB SATA 8MB Cache
    Corsair 512MB DDR Value Select PC3200
    Hauppauge PVR150
    2 X Hauppauge Nova-T (200009)
    FX5200 composite out

  8. #8
    Join Date
    Dec 2003
    Location
    Netherlands
    Posts
    351
    Darx-starz,
    Thanks for your info. I keep fragmentation down by running diskeeper every second night. I just saw it reported only slight fragmentation. The DMA's are set correctly. There IS a dvd-writer on the same ide cable as the HD. Both run on UltraDMA, the DVD on 2, the HD on 5. So, in my opinion that should be quite OK.

    Your FTP test is not feasible for me, as I don't have any netwok attached (yet ;-).

    Quote Originally Posted by [b
    Quote[/b] ]What does taskmgr say when you kick off a recording? Does CPU go 100% on the SYSTEM service?
    is not entirely clear to me. What I did was start a recording while taskmgr was open. The rows were sorted on cpu load. System didn't come hight on the list. The top ones were idle, taskmg and gbpvr approximately. To my eyes, that looks good. What's your opinion?

    THe quality is not the issue, I think. One recording I used for testing the delay mentioned by sub was a low-quality one. But others have the same problem.

    It appears you're quite a tweaker, if you have any suggestions, keep me posted!

    Thanks,
    MaBo
    ASUS pundit, pvr 350, celeron 2600, 512 MB, 160GB HD, winXP Pro, 12" touchscreen

  9. #9
    Join Date
    Jan 2005
    Location
    basingstoke, Hampshire England
    Posts
    338
    Hi Mabo. Looks like you are on top of things.
    Quote Originally Posted by [b
    Quote[/b] ]
    The top ones were idle, taskmg and gbpvr approximately
    Thats what I would expect. Leave it like that and do a long record or a live TV (same thing realy). You dont have to watch it. I suspect something is writing to the HD and cuasing a problem. I get a major hang when the other card kicks in (recording a show). It lasts about 3 seconds. I have seen gb-pvr makes system go 100% and I have killed the process and its restarted OK. Its happned a couple of times.

    Do the taskmgr thing and try and pin it down. Let us know how you get on
    Asus A7V880 Motherboard
    AMD Sempron 2400+ 1.67GHz (Socket A) CPU
    Maxtor DiamondMax Plus 10 200GB SATA 8MB Cache
    Maxtor DiamondMax Plus 10 160GB SATA 8MB Cache
    Corsair 512MB DDR Value Select PC3200
    Hauppauge PVR150
    2 X Hauppauge Nova-T (200009)
    FX5200 composite out

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