Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037
What is a CODEC... a Primer http://forums.adobe.com/thread/546811
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037
Report back with the codec details of your file, use the programs below... a screen
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I have seen what you describe with some AVI's, converted from other sources. In the cases, where I made my observations, the truncated AVI's were DV-AVI's, and their size was about correct, but PrPro only saw the Duration as about 02 mins.
Why? I have never been able to track down the cause, and it is very intermittent, affecting, say 1:5, when other factors were identical.
My workaround has been to Import the offending AVI's, into Adobe Premiere Elements, which has always seen the correct Duration, that PrPro did not, then just do an Export to DV-AVI from PrE. Those Exported files, showing the exact same characteristics and parameters, then always Import with the correct Duration, into PrPro. The two files even show as identical in several "dupe file" utilities, but something is obviously different. I just do not know what, but assume that there is something wrong in the files' header info (maybe just one bit, or byte, that is set differently, as the file sizes are 100% exact).
Wish that I had more info to offer, as I would love to find out what that difference was, and perhaps an easier workflow to correct it.