2 Replies Latest reply on Dec 5, 2006 10:28 AM by Newsgroup_User

    MPEG and aspect ratios

    Level 7
      I've been given video that was compressed to a certain size but when I
      import it into Director through the MPEG Advance Xtra it comes in as 720 x
      480 and when I import through Quicktime it imports as 816 x 428. It seems
      that Quicktime imports them to the correct size and I suppose interpolates
      the pixels to their correct rectangular shape that comes from the fact that
      they are videos shot in anamorphic (if that's the right way of saying it).
      The problem is that I have to stretch the sprite size to the correct viewing
      ratio when using the MPEG xtra. This I'm sure creates a performance hit.
      Is there some solution to this? We don't want to use Quicktime for this
      project.

      --
      Craig Wollman
      Lingo Specialist
      Word of Mouth Productions
      212-928-9581

      www.wordofmouthpros.com


        • 1. Re: MPEG and aspect ratios
          Applied CD Level 1
          Hi Craig,

          How much of a performance hit are you seeing by stretching the MPG to the proper aspect ratio? I’ve got a number of projects where I’ve corrected the aspect ratio to 16:9 by stretching and never noticed a problem, even on some low end machines (keeping in mind that 720x480 requires a certain amount of muscle, whether you stretch or not). I would think importing the video via QT shouldn’t change the underlying pixel dimensions of the video file (it’s just a link after all), so both QT and MPEG Advance are probably interpolating on the fly, I doubt it makes much performance difference who does the work. I’m not a video expert, just my $0.02.

          - Bob Gallo
          Applied CD Technologies
          • 2. Re: MPEG and aspect ratios
            Level 7
            Thanks Bob. I'm not sure yet how much of a performance hit the video is
            taking but as I'm sure you know there are so many factors that affect
            performance. The editor will mess with the data rate to see if he can find
            a compromise.

            I guess my question really is-Is there a way to have the MPEG Avance xtra
            import like Quicktime does so that the sprite doesn't have to be stretched,
            thus eliminating one more variable in the many that I can address?

            Craig


            --
            Craig Wollman
            Lingo Specialist
            Word of Mouth Productions
            212-928-9581

            www.wordofmouthpros.com
            "Applied CD" <webforumsuser@macromedia.com> wrote in message
            news:el47u9$puu$1@forums.macromedia.com...
            > Hi Craig,
            >
            > How much of a performance hit are you seeing by stretching the MPG to the
            > proper aspect ratio? I?ve got a number of projects where I?ve corrected
            > the
            > aspect ratio to 16:9 by stretching and never noticed a problem, even on
            > some
            > low end machines (keeping in mind that 720x480 requires a certain amount
            > of
            > muscle, whether you stretch or not). I would think importing the video via
            > QT
            > shouldn?t change the underlying pixel dimensions of the video file (it?s
            > just a
            > link after all), so both QT and MPEG Advance are probably interpolating on
            > the
            > fly, I doubt it makes much performance difference who does the work. I?m
            > not a
            > video expert, just my $0.02.
            >
            > - Bob Gallo
            > Applied CD Technologies
            >
            >