Previous 1 2 Next 19 Replies Latest reply: May 27, 2007 1:35 PM by Hi I'm A Mac
johnny semi Level 1 (0 points)
I use quicktime 7.1.5 on my iBook G-4 and the video is choppy... voice doesn't match picture and skips a little. The same material on dvd runs without any problem on my iMac G-5. Is it more likely a problem with the software or with the drive on the G-4? Should I try to reinstall quicktime? Can I download this from the support site? If not a software problem, is there anything I can do at little expense.

ibook g-4, Mac OS X (10.4.9)
  • David M Brewer Level 6 (9,365 points)
    No, don't reinstall.

    Can you give a little more info on the video in question?

    Fomat: .mov?
    Codec: h.264?
    Size xy: 720 pixels by 480 pixels

    More info on you computer.
  • George F Level 1 (0 points)
    I have a similar problem. Player is Quicktime 7.1.5

    Format .mp4
    Codec mp4v
    Size 544x416
    Frame Rate 25

    computer is new Intel-based Mac Mini

    Video playback is choppy and has green and purple artifacts. I tried playing it back with another program called VLC and it played fine. All other videos I have with the extension .avi play fine in Quicktime. Do I need to get a plug-in for Quicktime to play .mp4 files?

    Intel Mac Mini   Mac OS X (10.4.9)  
  • johnny semi Level 1 (0 points)
    Can you give a little more info on the video in question?

    Fomat: .mov? My format is MP4; is that the same as .mov?
    Codec: h.264? I could not locate this.
    Size xy: 720 pixels by 480 pixels... size is 640 x 480

    The video was made on a Sanyo Camcorder, Xacti VPCC 6

    More info on you computer.
    The computer it does not run on, the G-4, is 1.42 gh2 with 1GB DDR S DRAM

    thanks for your thoughts
  • QuickTimeKirk Level 9 (52,237 points)
    Your iMac G4 is too underpowered to view that dimension H.264 Video file.
    The DVD version would be MPEG-2 and your machine wouldn't have any troubles.
  • David M Brewer Level 6 (9,365 points)
    Just to confirm that your computer is underpowered to view that dimension. Try viewing on of the trailer on Apples web site.

    Pick one of the HD trailers, size 480p.
  • johnny semi Level 1 (0 points)
    The trailer played fine with no problem...

    How can I determine if my format is H.264? Does this matter?
  • David M Brewer Level 6 (9,365 points)
    Look under info in the menu....If you have Quicktime pro look under properties.
  • johnny semi Level 1 (0 points)
    I don't have quicktime pro. There is no info command in the normal place. The info command on the movie does not mention H.264. Any other suggestions?
  • QuickTimeKirk Level 9 (52,237 points)
    Open the file using QuickTime Player.
    Under the Window menu choose Movie Info.
  • johnny semi Level 1 (0 points)
    The relevant portions show:
    Format: Apple MPEG4 Decompressor, 640x480 Millions
    AAC, Stereo (LR), 48.000kHz
    FPS: 29.97
    Playing FPS 22.96
    Data Size 668.43 MB (just happened to be a big file, small ones have same problem
    Data Rate: 3080.16 kbits/sec
    Normal Size 640 x 480

    One other comment. I had been trying with great difficulty to edit my videos with Imovie and my recollection is that is when I started having problems with the videos generally. I never attempted editing on my G-5 and never had any problems playing the raw video.
  • QuickTimeKirk Level 9 (52,237 points)
    Not H.264 Video but the file has a very high data rate.
    The one shows 29:97 as a frame rate yet you barely get 23 frames per second during playback.
    Because your computer can't decode the file fast enough is the reason you're not getting the proper frame rate during playback.
    Without a proper frame rate the video will appear choppy.
  • Crzydrumer Level 1 (0 points)
    I have an ibook G3 14 inch 700mhz processor, 640 RAM. I can't get movies to play in quick time, but they play on the dvd player fine. In quick time, the video is very choppy and then stops while the audio goes for a little while longer until it eventually starts to get choppy. How would I be able to rip movies so that thay they are on my harddrive and play through the dvd player so that I can save some battery life?
  • johnny semi Level 1 (0 points)
    ok makes sense, thanks. One last matter that still puzzles me. I was able to run these videos 8 or 10 months ago without problem. About 3 or 4 months ago, they stopped running smoothly, so I ignored it and used by
    G-5, 1.8 gighz which worked fine. I tried again today on the G-4 after closing all the other applications and still have choppy video. Any idea what changed?
  • johnny semi Level 1 (0 points)
    Found this related pod cast from David Bankston and thought it was really helpful:
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