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MediaInfo can tell you if CABAC is being used. Under the Debug menu, enable the Advanced settings. Then under the View menu, select Text. On the left will be a listing for CABAC somewhere.
On Wikipedia I read where you need Main level or higher for CABAC.
Yes, the files do need to be encoded using the Main profile for CABAC to be used. But since the Apple TV uses the Main profile, and videos encoded with that profile tend to look better, I really want to encode using it. I used the software tool you suggested and discovered that MP4 files made with Elements 4 using the Main profile and the standard stream setting use CABAC, while those made with the iPod setting do not. Thank you very much for your help.
I have been trying to get the best mp4 settings for apple tv also and found the mp4 encoding in premiere elements 4 to not be that great. It could be that there are some setting i haven't fully optimized (don't understand every option), but i tried a lot of things.
What I recently found is that if I burn my video to a dvd in PE and then rip it back to the computer using handbrake with the apple tv setting i actually get better results. The picture is a touch soft, but no more so than when exporting directly to MP4, and the colors seem to hold up better. Also, I have some text/images in some videos and the text is much crisper when doing it this way.
Just a thought.