JMStudio won't play .avi files - mpeg-2 works fine

Why doesn't JMStudio play .avi files?
A small application that I created with JMF 2.1.1 has the same trouble.
My .avi files can be played successfully with mediaplayer and also zoom player but JMStudio chokes on them. Why?
I want to create a two-pane player for side-by-side video comparison with JMF but I don't want to start the effort if simple .avi playback is not possible.
Sun's JMF 'supported format' page shows that all forms of .avi are at least 'playable' - yet my files are not.
I have several mpeg-2 files that are playable in JMStudio and also in my simple app - so I know that the code is working.
There are several old threads on this forum that ask this question but none of the threads give a decent answer.
Please help.
Thanx,
skigrinder

Got it working.
Apparently, JMF can't handle type-1 .avi files but it can handle type-2 .avi files.
Nero and Sony-DvGate both create type-1 .avi files in the capture process from a DV camcorder.
I found a (Windows) utility - DvConverter - that will convert a type-1 .avi file to type-2.
I'm now able to play these type-2 .avi files in JMFStudio and also in my own prototype player.
Surprisingly, the FramePositioningControl functions also work - skip() and seek() !!!
I'm currently working on eliminating the 'comb-teeth' effect that exists in both JMFStudio and my own player.
I've read that this effect is the result of interlacing artifacts but my experience has shown that it also has a lot to do with the codec that's running. In windows, installing, un-installing, and re-installing codecs has a tendancy to mess with the registry in unpleasant ways resulting in a lot of time wasted trying to get rid of this 'comb-tooth' effect.
Andrew, do you know of a foolproof way to solve this problem on windows?
Thanx,
skigrinder

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