Which codec for screening ?


    Feb 28 2008 | 10:21 am
    Hello,
    We're using photo-jpeg codec (medium quality, without sound, 720x576,
    25fps) movie files and it's depressingly stuttering. Our machines (OSX)
    are monster workstations and i wonder where's the problem. When we play
    our files using quicktime, it's perfect. In jitter, it's not acceptable.
    Why ?
    Which is the best codec we have to use to get a smooth, high quality
    screening ?
    f.e
    ps: latest jitter, video editing macintosh workstations, something
    called "blackmagic video output" to go to the video projectors
    --
    f.e chanfrault | aka | personal computer music
    >>>>>>> http://www.personal-computer-music.com
    >>>>>>> |sublime music for a desperate people|

    • Feb 28 2008 | 3:42 pm
      are you displaying your video in openGL ?
      did you try Vade's optimization patches ?
      i had issues with heavy files ( above 1gb no matter dimensions/lentgh ), now i try to stay under 1Gb, even on powerfull machines .
      i also separate the actual video process from the control , i now do applications for the video displaying engine and keep a patch for the controls , using udp to communicate between two.
      "loadram" can help but jitter has a 2gb limit :(
      if you plan to just broadcast direct to window can bethe solution for playing heavy files , try this patch if it is of any help :
      Quote: f.e wrote on Thu, 28 February 2008 11:21
      ----------------------------------------------------
      > Hello,
      >
      > We're using photo-jpeg codec (medium quality, without sound, 720x576,
      > 25fps) movie files and it's depressingly stuttering. Our machines (OSX)
      > are monster workstations and i wonder where's the problem. When we play
      > our files using quicktime, it's perfect. In jitter, it's not acceptable.
      > Why ?
      >
      > Which is the best codec we have to use to get a smooth, high quality
      > screening ?
      >
      > f.e
      >
      >
      > ps: latest jitter, video editing macintosh workstations, something
      > called "blackmagic video output" to go to the video projectors
      >
      > --
      > f.e chanfrault | aka | personal computer music
      > >>>>>>> http://www.personal-computer-music.com
      > >>>>>>> |sublime music for a desperate people|
      >
      ----------------------------------------------------
    • Mar 01 2008 | 7:27 pm
      On Feb 28, 2008, at 3:42 PM, karl-otto von oertzen wrote:
      >
      > "loadram" can help but jitter has a 2gb limit :(
      >
      That's not actually true - while jitter does have a 2GB limit for
      jit.matrix objects, the jit.qt.movie object CAN load files larger
      than 2GB. We've done some that are over 4GB, but it eats up a lot of
      real RAM (much more than the movie file size itself, by a factor of
      about 4X)
      Cheers
      Evan