Peter Wimmer has a MVC to AVI prototype converter here:
http://www.3dtv.at/Downloads/MVCConverter010_en.msi . It will produce two AVI streams from the MVC (MPEG stream or MP4 file) and it will not work directly on MAC, but it is a step to separate the two streams out of the single MVC stream. The AVI streams can be subsequently converted. This converter currently is at beta level. The converter only works under windows. Some additional information from Peter:
"The MVC to AVI Converter converts MPEG Transport Streams (*.mts, *.ssif) or MP4
files containing 3D video data encoded with the H.264 MVC codec to two
uncompressed AVI files, one AVI file for the left and one for the right view.
Click 'File|Add Files' to add an MVC file to the batch list, then click
'File|Start Conversion' to convert all files in the batch list to AVI format.
The AVI files are stored in the same folders as the MVC files. The 'Left' or
'Right' suffix is added to the AVI filenames.
The audio track is only decoded if the ffdshow Audio Decoder is installed."
