QT Playback issues

Discussion in 'Mac Pro' started by desciple, Jan 2, 2009.

  1. desciple macrumors newbie

    Mar 29, 2005
    SPECS: G4 800mhz AGP- 768MB RAM- OSX 10.4 - QT ver.7
    ISSUE: When playing a quicktime file (ie. 720x480 pxls / 30fps) it stalls and the playback looks more like a choppy 10 frames per second. Smaller dimensions (320x240) look fine.

    QUESTION: Is there a solution to have large videos playback more smoothly on my G4? Is this a ram issue? Do I need to get a better video card, if so, which one to get? Or is this going the be the best as it gets?

    Please help if you can.
  2. irishgrizzly macrumors 65816


    May 15, 2006
    I've had the same problem on my iBook G4. It's got a gig of RAM but when I play larger video files they are increasingly choppier. They seem to get gibber every year! I can't upgrade the card in that machine (wouldn't if I could, would be a waste of money).

    What card do you have in yours? You may be able to get a better one cheap 2nd hand.
  3. iamcheerful macrumors 6502


    Oct 3, 2008
    IMHO, the bottleneck comes from ... first the CPU, next the hdd.
    It depends very much on the codec used too. h264 can be pretty harsh on the cpu depending on the resolutions and etc. on the other hand, the more common divx doesn't require as much cpu power.

    GPU (aka video card) shouldn't make such an impact on your system as drivers are generally not so well optimized on the macs, esp. the older macs. in fact, it appears that only the latest portables with the newer GPUs from NVIDIA are able to help out. There's also a recent article (can't recall where, probably from Annatech) that a low end CPU coupled with an efficient GPU, the system is able to handle 1080p videos efficiently. Let's hope that comes to the most of the newer Macs with Snow Leopard (10.6).

    RAM and other factors are generally a non-issue.
  4. ChiaJesus macrumors newbie


    Feb 8, 2008
    I'm having the same problem ever since I upgraded to 10.5.6. I reinstalled QuickTime and that helped for a while but it's choppy again. No problems with VLC.

    I think the problem relates to the windowserver process. I noticed that whenever it spikes up to 10% CPU that's when QuickTime starts giving me grief. I hope Apple comes up with a resolution soon.
  5. indiochano macrumors regular

    Jun 7, 2008
    i had problems and i realized that the video was encoded on apple's pixlet video codec... had to compress it with sorenson squeeze and the playback was normal.

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