960x720 ftg looks squooshed but ok in fcp

I'm working w/ some green screen ftg. Captured in Final Cut at HD (960x720) w/ DVCPro HD 720p 60 codec. I export the ftg., w/ no compression, million colors, at current size, which strangely shows up as 637x358. I import that in AECS3. It comes in at 960x720 but it looks squooshed. I key it and render it w/ animation codec at 960x720. I import that back into final cut (or avid) and it looks fine. This is how I have always done it.
The problem today is that I have to provide my client with a matte and a fill. When I give them the rendered file from AE (QT file) it looks squooshed. The client will use these files in flash which I know nothing about. They want to know why the QTs I provided them look wrong. Can anybody explain?
Brad Stewart

DVCPRO HD does not use a square pixel aspect ratio (I believe 720 is 1.33:1 and 1080 is 1.5:1). AFIAK, Flash video always needs square pixels. Put your 960x720 comp into a square pixel 1280x720 comp and everything should look and render fine.

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