I needed a way to change the aspect ratio of MPEG streams without reencoding them. I tried PullDownX but it didn't work correct. Then I remembered the (FREE) OS 9 version of "Force 4x3" and "Force Anamorphic" - both don't work using classic in either 10.3.9 or 10.4.5. I don't have a native booting OS 9 mac so I tried the OS X version of the "MPEG Append suite". After "buying" the trial(!!!) i opened one of the apps. I was granted with a "Register or try the Trial" screen but i never came past that screen, because it kept reappearing every time i clicked on the "trial" button. So i sent an email to <dvd_sp_helper@mac.com> and received this:

---snip---
The original message was received at Sun, 2 Apr 2006 00:00:20 -0800 (PST)
from mail16-ce1 [10.13.11.41]

----- The following addresses had permanent fatal errors -----
<dvdsphelper@hoot.to>
(reason: 550 Host unknown)

----- Transcript of session follows -----
550 5.1.2 <dvdsphelper@hoot.to>... Host unknown (Name server: hoot.to: host not found)
---snip---

So don't bother trying this pile of c++p - if someone else has a suggestion for changing aspect ratios of MPEG streams in OS X, please let me know.