SGI provides QuickTime movie support as part of Movieplayer in IRIX
  5.1 and later.  If you can't or don't wish to upgrade, you may wish
  to investigate a public domain program called Xanim which offers
  QuickTime capability.

  The XAnim Home Page is:

    http://www.portal.com/~podlipec/home.html

  and it's available for anonymous ftp from:

    ftp.portal.com   /pub/podlipec/xanim2703.tar.?
                     /pub/podlipec/cinepak.readme
                     /pub/podlipec/indeo.readme

  If you are running IRIX 4.0.5 (any variant) or earlier, please
  consider upgrading to IRIX 5.3 (if you have an R3000-based system)
  or best of all, to IRIX 6.2.  Both releases contain a more
  full-featured set of movie tools bundled with the system.
  
  If you upgrade to IRIX 5.3, you should download the Digital Media
  Tools 5.5 product from SGI.  They can be found at the following
  URL:
  
  http://www.sgi.com/Products/Evaluation/dmedia/
  
  This is an enhanced set of digital media tools for IRIX 5.3 systems.
  It provides additional support for QuickTime features and MPEG.
  You do not need to download the Digital Media Tools 5.5 product
  if you have IRIX 6.2.

  IRIX 6.2 contains all of the enhancements in Digital Media Tools
  5.5, as well as additional features and updated applications.
  (Note: if you need to create content in MPEG-1 or CinePak format,
  you will still need to purchase codec licenses).