Bret and Todd,
Here are some discoveries related to my query.
Bret, you are SO RIGHT! I went back and used MediaInfo on different copies of my video files and they were all 23.976 fps. I then started up my Canon Vixia and went through the menus — one option is to record at 23.976 fps, which is as close as it gets to 24. This is the cheapest Canon model that doesn’t limit recording to 29.etc fps.
The anomaly I remembered was with the film of a friend who had shot in film at 24 fps, had it transferred to 24 fps progressive video but edited in FCP7 which interprets 24 as 23.976, exported .mxf files for a mix then found that the mix seemed to slip out of synch at the rate of about 1 frame per 1,000 frames so that it was out significantly at the end of the 80 minute show. We never really figured that one out for sure but the mixer fixed it and it wasn’t critical for that film.
As to your comment that it doesn’t matter because it’s modern and digital, Todd, I don’t really follow this though it may be true. Does an audio track recorded at 48k sampling rate play any differently when matched to 24 fps vs 23.97 fps? That’s over my pay grade, but I did decide that if I was cutting to fractional time rhythms I had do know whether I was counting frames at 24 fps or 30 fps. 6 frames is 4 per second and 8 frames is 3 per second. In the stuff I do that makes a difference.
The weird answer for the AME commands was this:
If I used two of 3 methods, either importing AVCHD files from a card copy into the Media Browser in AME and dragging a custom preset onto the selected files, or bringing files in the same way and doing Apply to Queue, AME would apply a standard Premiere Pro Res 23.976 preset to them all. The only way I could get AME to use my preset was to copy the AVCHD files to a desired folder using the Mac finder and then import them into the queue window by double-clicking in an empty space to import them from the finder location instead of the AME browser. That way AME used my custom preset (which was ProRes HQ 24 fps) to import them.
Thanks again for everyone’s responses.
Cheers,
Robert