QT Player does bad job of playing AVI movies

Discussion in 'Amateur Video Production' started by John E., Jan 2, 2007.

  1. John E.

    John E. Guest

    The movie displays in QTP window split in two: half the scan lines make up an
    image on the left half of the screen, and the other half of the scan lines
    make up an image on the other half.

    QTP does this to most of the MP4 videos I have. (Other players -- MPlayer;
    VLC; XinePlayer -- play it just fine.)

    The film is MP4 format (XviD video; MP3 audio).

    What's the cause for QTP being so bad at MP4 playback?

    OS X 10.3.9; QT 7.1.3

    John E., Jan 2, 2007
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  2. John E.

    sbt Guest

    Usually, it is because you don't have the proper (or the current) codec
    installed for the content in question. With the DivX codec that
    accompanies Toast 7 or the freely downloadable DivX codec from
    www.divx.com, all of the divx and xvid files with mp3 or mp2 audio I've
    encountered play just fine in QT Player. And, with the AC3 component,
    it even plays the ones with Dolby audio. Older versions don't work very
    well with QT 7.
    sbt, Jan 2, 2007
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  3. John E.

    John E. Guest

    Thus spake sbt:
    Ah. Looks like it's time to upgrade the codecs.

    Thanks, Spenser.
    John E., Jan 2, 2007
  4. John E.

    gtr Guest

    How does one "upgrade the codecs". Seems like QuickTime should have
    such an option where it goes and snatches whatever codecs might have
    come along since the last check.
    gtr, Jan 2, 2007
  5. John E.

    sbt Guest

    Codecs are just "plug-ins." QuickTime will automatically update the
    codecs that come with it; however, it doesn't "know" from whence you
    obtained third-party codecs (you can even write your own). You go to
    the source where you obtained your divx (or whatever) codec, download
    the new version, and install it according to whatever instructions
    accompany it.
    sbt, Jan 2, 2007
  6. John E.

    THO Guest

    He brings up an interesting question. Quicktime can download certain
    components that it needs for playback. Why can't Quicktime determine
    what codecs are needed for the AVI and then download them? Does Apple
    just not want to deal with competing codecs or is there a technical
    reason why that wouldn't work?
    THO, Jan 2, 2007
  7. John E.

    sbt Guest

    There are some difficulties...

    1) There are often multiple codecs that could deal with a particular
    encoding. For example, xvid can be handled by at least three of which
    I'm aware.

    2) Many codecs are copyrighted (maybe most of them) and Apple doesn't
    legally have the right to distribute other peoples'/companys'
    copyrighted work. Also, not all codecs are free -- for example, MPEG-2
    requires a fee because the MPEG Consortium charges a royalty for
    implementations of their stuff.

    3) The logistics of tracking where various codecs are available becomes
    an expensive proposition, either in terms of manpower, $$, or both.

    4) The QT container format tells, generically, what encoding is being
    used, not what codec is required to deal with it.

    Of course, Apple could implement such a process, but it would cost a
    fair amount to support and maintain the operation, which means that
    they would have to charge for it.
    sbt, Jan 2, 2007
  8. John E.

    Rowbotth Guest

    I guess I'd ask why he isn't using the VLC Player? It seems to play
    about every *.avi vid file I've ever met with good success....

    I mean, you can lead a horticulture but you can't make her thing, what?

    Rowbotth, Jan 2, 2007
  9. John E.

    gtr Guest

    It's "thinking" she can do.

    I do use VLC for various purposes, but my browser calls QuickTime as
    well. I also use quicktime all the time in relation to iMovie,
    Garageband, and so forth. I've followed the Mac since os 7.5, and with
    the advent of OSX I've been enjoying not having a outside tool for
    every activity, having them all work together, etc.

    So when possible I use quicktime and when it's not possible I use VLC.
    gtr, Jan 3, 2007
  10. John E.

    bearclaw Guest

    Whew. Thanks. For second, I thought he had a lithp.
    bearclaw, Jan 3, 2007
  11. John E.

    Rowbotth Guest

    Actually, it is thinking that she CAN'T do....
    Rowbotth, Jan 3, 2007
  12. John E.

    bearclaw Guest

    Great set of lungs, though...
    bearclaw, Jan 3, 2007
  13. John E.

    gtr Guest

    Yikes! It's thinking she CAN'T do. And she's a WHORE damn it!
    gtr, Jan 3, 2007
  14. John E.

    larwe Guest

    All of these difficulties are surmounted by having the codec developers
    register their offerings with Apple. That's the way Apple does it,
    that's the way Microsoft does it (kinda). The FOURCC code takes you to
    a page listing compatible codecs. You pick the one you want, and buy it
    if it's buyware.

    If developers don't care enough to register their codecs with Apple,
    then too bad.
    larwe, Jan 3, 2007
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