Odd video stuttering

Discussion in 'macOS' started by snowmoon, Apr 15, 2009.

  1. snowmoon macrumors 6502a

    snowmoon

    Joined:
    Oct 6, 2005
    Location:
    Albany, NY
    #1
    I have a UBMP 2.4 15" and under my user I can't play back the 1080p trailers such as astroboy without stuttering. If I switch to the guest account they play fine.

    I have deleted any quicktime prefs
    I have deleted all ByHost prefs
    I have run applejack to remove corrupted prefs
    I have install and uninstalled perian
    I have uninstalled flip4mac
    I have renames .cshrc
    I have removed all Login Items
    I have removed all launch agents in my library
    I have removed InputManagers
    and I'm sure a few more that I've already forgotten about.

    Both users show the same decoder, but the guest plays smooth and without difficulty what my users stutters to keep up with playback. Neither seems that different in terms of CPU and neither is getting anywhere near 100% CPU.

    I'm going insane trying to figure out why this works for one user but not for the other.
     
  2. richard.mac macrumors 603

    richard.mac

    Joined:
    Feb 2, 2007
    Location:
    51.50024, -0.12662
    #2
    see what apps are using a lot of CPU load in your account using Activity Monitor and quit them.
     
  3. snowmoon thread starter macrumors 6502a

    snowmoon

    Joined:
    Oct 6, 2005
    Location:
    Albany, NY
    #3
    Load is very low, no other apps are using CPU time. There is free memory as well.
     
  4. snowmoon thread starter macrumors 6502a

    snowmoon

    Joined:
    Oct 6, 2005
    Location:
    Albany, NY
    #4
    OK, it's not my account. It's whoever is running the first copy of quicktime.

    If I ( or any account ) runs quicktime it stutters/judders

    If I run quicktime and leave it open and switch to another account it works fine in the second ( or third ) account by consuming twice the CPU.

    WTF? I'm testing with the 1080p Trailer for AstroBoy since it's easy to spot.
     
  5. Jethryn Freyman macrumors 68020

    Jethryn Freyman

    Joined:
    Aug 9, 2007
    Location:
    Australia
    #5
    I have this happen with Quicktime with some movies too, but not with HD movies, just average low quality .avi files.

    Try VLC, it should play them fine.
     
  6. snowmoon thread starter macrumors 6502a

    snowmoon

    Joined:
    Oct 6, 2005
    Location:
    Albany, NY
    #6
    I finally figured it out. It was a hardware issue.

    Stuttering went away with the application of the SMC 1.2 update for the UMBP.

    I couldn't believe it either.
     

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