Quicktime 10 won't play .avi files.

PI had the same problem. Downloaded & installed Perian 1.1.4 and my .avi files now play in QT 10.

There seems to be one major bug or a missing codec in Snow Leopard when it somes to DV-Pal avi's.
I have some AVI-Files from Windows-Computers that now can't be played on my iMac with SL. I can play them on my Powerbook with Tiger.
But I also have DV-Pal-Avis than CAN be played. The only difference I noticed between them is that the playable ones were directly captured from tape and the non-playables were CREATED (in this case with various versions of Adobe Premiere).
I used "Media Info Mac" ( http://mediainfo.massanti.com) to display all properties - one difference between them is "Display aspect ratio" (playables have 5/4, non playables have 4/3).
Any ideas? Does someone have the same problem?
Could it be a bug in Snow Leopard that some parts of the DV-Pal-codec is missing?

I was recently having the same problems with .avi files and QuickTime Player 7.6.4 after some OS upgrades. I downloaded and installed Perian 1.2, and now the .avi files play like they did previously. Interesting, now even one that VLC does not play completely cleanly plays fine with QuickTime Player.

Why doesn't Apple just fix QuickTime instead of making us install Perian?

Thanks for the tip about Perian!

Make sure you go to system preferences and all the way at the bottom you will see Perian in the "other" section open it then under the general tab make sure that it says installed, if not click to install and you should be good to go. This happened to me a bit frustrating so try this out.

I have download Perian 1.2.1 on http://perian.org and it's perfect , now when i double-click on my .avi(s) it's works succesfully