14 Replies Latest reply: Mar 10, 2010 6:29 PM by Beren
Beren Level 1 Level 1 (0 points)
I cannot swear that the problem began with the upgrade to Snow Leopard but I think it did. When I download movie trailers from Apple, they are now jumpy. I do not see a continuous flow of images but rather a series of still pictures. The audio is fine but the video is jumpy.

What can I do to correct this?


iMac, Mac OS X (10.6.1), Intel Core Duo processor
  • Limnos Level 8 Level 8 (42,150 points)
    I am surprised this is happening on an Intel computer. Often it is due to the slower hardware of older computers (especially G4s) not being able to handle newer encoding video formats.

    Check things that might be slowing down your computer. Enough RAM? Too little hard drive space?
  • Beren Level 1 Level 1 (0 points)
    I have plenty of free space on my hard drive. 1 gig of memory. I haven't experienced this problem until recently.

    Any other ideas? How do I troubleshoot this? Any information I can provide that would make things easier for you all to diagnose the problem?
  • Limnos Level 8 Level 8 (42,150 points)
    What happens if you use a player such as VLC?

    I recall seeing similar comments in earlier topics so you may want to search this forum for others with similar issues.
  • AntManBee Level 1 Level 1 (0 points)
    I've been having the same problem for a while, with an iBook G4 & Quicktime 7.6.4 - the picture is just a staggered set of still images, and is particularly bad with HD videos and Vimeo, but also MPEG4 files. VLC is fine, but I can't see a way of having it play streamed videos.
  • Beren Level 1 Level 1 (0 points)
    I thought I would bump this and see if anyone has any suggestions how I can correct this problem. I have plenty of space on my hard drive. The OS is fully updated. Any ideas, friends? This jumpy Quicktime is driving me nuts.
  • McTweak Level 1 Level 1 (5 points)
    I'm having the same "jumpy" problem with Quicktime Player version 10.0 (90.3.1). I did not have this problem until after upgrading to Snow Leopard. (VLC plays the same videos perfectly.)
  • KStrat2258 Level 1 Level 1 (0 points)
    I too started having this problem after installing Snow Leopard. I have plenty of free space and I recently repaired my disk permissions, so I'm not really sure what to do.

    Since a good deal of people are having this problem, especially with playback of HD videos, I'm assuming a patch of some sort will need to be issued soon for Quicktime Pro.
  • KStrat2258 Level 1 Level 1 (0 points)
    Thank you, thank you, thank you for suggesting VLC! I just downloaded it and it runs my HD videos PERFECTLY!

    No offense Quicktime, but I'm sticking with VLC until Apple fixes you
  • Beren Level 1 Level 1 (0 points)
    The jumpiness of Quick Time remains a problem for me. The high def movie trailers run most smoothly for me if I only play them after the entire trailer has been downloaded; but even then I still experience periodic jumpiness. The soundtrack is fine, but the images do not flow smoothly. Sometimes it's like jumping from one still photo to another still photo.

    How can I troubleshoot this problem? What can I do to correct it? Any ideas anyone?

    I have cleared all my caches. I have run all the maintenance scripts. I have run all the cleaning tasks provided by OnyX. Yet still QT runs jumpy for me.
  • Beren Level 1 Level 1 (0 points)
    I finally figured out how to download an Apple trailer and save it on my hard disk. I still have the jumpy problem when I watch the trailer with Quick Time; but it flows smoothly when I watch it with VLC.

    I sure wish Apple would fix QT or tell me how to fix it on my end. Are the Apple techs even aware of this problem? Are they working on a fix?

    Can anyone help?
  • SeanPeoples Level 1 Level 1 (0 points)
    I'm also having this issue. After some troubleshooting though, this doesn't appear to be a QuickTime issue.

    On my machine under OS X 10.5.x, the full-screen MPEG-4 video playback was fine under QuickTime, Flash, or Silverlight. Once I upgraded to 10.6, I started having playback problems with MPEG-4 regardless of the source.

    VLC plays the same videos perfectly both under 10.5 and after the upgrade to 10.6. This is because VLC uses its own MPEG-4 codec whereas QuickTime, Flash, and Silverlight rely on Apple's.

    Long story short, it's Apple's MPEG-4 codec that's broken and needs to be patched. As of 10.6.2 it's still broken.

    Message was edited by: SeanPeoples
  • joel Holt Level 1 Level 1 (0 points)
    this is a terrible issue for me, if i am exporting from final cut pro to get an mov file as a master to go to a dvd duplicators can i assume that the file is ok if it is jumpy in QT x? i am very unhappy with apple on this issue and their tech support would have to know about it yet when i speak with them on the phone they don't mention it. what to do???
  • Steve Keller Level 1 Level 1 (5 points)
    I have the same problem and it happened with the Snow Leopard upgrade.
  • Beren Level 1 Level 1 (0 points)
    I sure hope the Apple techs are watching this thread and are working on a fix for this problem!