powerpoint - Video Trimming - Media is in a format which cannot be trimmed

I inserted an AVI video into a PPTX file and it's not letting me trim it.  This is peculiar because I recall being to able edit an AVI file in the past.   Anyone know how I can remedy this?

is the PPT 2010 service pack responsible?   something else going on?
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Hm. If you go to the File menu, do you have options to optimize media for compatibility? If so, run that and then see if you can compress.

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