And didn't you back up the BPAV folders or do you generally trash camera masters?
[James Marshall]" how to play MP4 files?"
Are you trying to play them or trying to use them in an NLE?
VLC will play them.
ClipBrowser (use 2.5) can import orphaned MP4 by using File/Import.
If you're on a Mac, XDCAM Transfer can import orphaned MP4 and rewrap to MOV.
Don't take this too personally but:
So many people are tossing BPAV that I can't help but believe that there's some entity telling people to do this. I can't fathom any person coming to the conclusion that BPAV can be tossed on their own. Back in the days of BetaSP, while I saw some bad tape handling (like putting them next to degaussers), I don't recall anyone taking off the plastic shell and just saving the tape spools.
Michael, we did try VLC no luck, the clip size vary from 150mb to 3gb. Also tried clip browser 2.5
xdcam tranasfer, serveral media recovery soft ware as well, I think some vital code is missing from the MP4 clips?
Scavenged files may sometimes work and sometimes not ... what may be perceived to be a valid file container to the typical recovery software might be either complete rubbish or perhaps only a part of the file,and /or the contained data may or may not contain a valid structure or index that would make it recognizable if actually "opened". If these masters are irreplaceable and if all else has failed then you may need to look to more specialized recovery means such as the "Treasured" app and the skilled and manually intensive "Movie Repair Service" ... both are offered by AeroQuartet: http://aeroquartet.com/