Hello to Alan Somers,
Thank you for your script. It is a lifesaver.
Just out of interest, there is a recently released open-source app called Media Converter:
http://media-converter.sourceforge.net/
It runs scripts. If you download Media Converter, go to preferences, you can download extra scripts to add to it. There is a script to rewrap AVCHD without re-encoding or recompressing.
I recently bought a new Panasonic HDC-SD900 camera (very similar to last year's 700 series camcorders). For files shot in 50p, this Media Converter AVCHD script transcodes it very well. However, for interlaced clips, or 25p clips, it fails (Panasonic's 25p 'Digital Cinema' movies are apparently stored as an interlaced stream).
Because I always shoot 25p, I could not use Media Converter. After that, I Googled the subject and found Alan's great script.
I write this in the hope that someone might be able to find why the Media Converter script does not work on 25p and interlaced files. If that could be corrected, then Media Converter would then be a 1-stop application, which would be easier than installing multiple apps and codecs.
Until then, Alan's Automator script is the only usable way to rewrap AVCHD.