It seems the QuickTime on Windows has limited support of codecs. I wonder if there is a way to convert AVI files to a format supported by QT on Windows. Does anyone know the way and has done it?
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You've told us nothing about the files except the extensions. Nothing really to go on. What are the codecs?
1) File -> Open, open your source file. The program may take a while examining it.
2) Leave Video Output and Audio Output set to Copy.
3) Set Output Format to MP4 Muxer.
4) Select File -> Save. You may need to add the .MP4 extension yourself when naming the file.
If the audio isn't a QT friendly format you will have to reencode it.
Qt may not have quite the abundance of codecs that Avi has, but it's no slouch either.
You just need to get the right plugin. Qt natively works with mpg4-sp but not mpg4-asp. For that you shoud get either divx or 3ivx, both of which are supposed to come with Qt-for-windows components (though I haven't checked to see if they're still maintaining updates on those).
Xvid never got around to creating a qt win component, prob because most assumed (inaccurately) if you were doing xvid/divx, you would already be using avi/directshow.