Ok, test results from today are in:
Someone suggested the a professionally authored BD could be ripped, burned and played on the PS3.
So I took one of my BD movies and did the extraction, recreated the folder structure and burned the resulting files to BDRE twice, once with Sony media and once with TDK media.
The result: my fair use backup (
) plays on the PS3 just like the original disc. This is true of both media brands so it would seem that the media brand compatibility question is answered - there is no difference.
My second test was to replace the 00001.m2ts file on a BDAV with a different file and see if that worked (looking for a workaround to the audio limitations). This failed. It might have worked if the files were more similar...
My thoughts based on these experiments:
BDMV support does exist but is either flawed or the Sonic DVDit HD Pro images are flawed. I have some ideas to follow regarding this.
It still fascinates me that Marc saw some success with BDMV from DVDit and nobody else seems to have had the same successes.
In any case, it seems that we are partially there - we just have to either determine what the limitations are with the PS3 playback and work around those or likewise for DVDit Pro HD.
As always, will keep you informed of my progress.