Could be something on a system level. I suspect that it may relate to Windows not recognizing your BluRay drive correctly and/or may frown on an invalid key for the player's encryption and thus does not produce a valid association for these file types. In any case, try installing a commercial BluRay player software and see if it makes any difference....
Thanks for the suggesstion Mylenium, but that didn't help either.
I installed PowerDVD which came with the Blu-Ray drive, and also a trial of ArcSoft's Blu-Ray player, and neither would play the files.
Any other suggestions? This is killing me. I don't understand why they would play before and not now. The files arne't corrupt. Even new rendered outputs in the same preset won't play. They'll load into Encore just fine though and even are listed as "Don't Transcode", so I know the files themselves are okay.
Could it have anything to do with drivers? I was testing an Nvidia video card with my last build and now I'm just using a Sandy Bridge chip with Intel's on-board video. But I do remember even when I took the Nvidia card out and just ran on-board video the last time, the files still played fine...
I just downloaded the last version of Adobe Media Player (1.8) to see if that would work. Nope. Plays all files fine except for any .m4v H.264 Blu-Ray files produced by After Effects...
What can I do? I am trying to produce Blu-Ray discs for marketing and I need to be able to preview the outputs in an easy way. My other other altervative is to output in lossless AVI and then reencode to x264 or something. But that just adds more steps and time. And honestly, the Mainconcept encoder looked good enough for my projects. I just want to output direct to MPEG-4 Blu-Ray from AE or Pr and have the files be playable!
Change extention to mts or m2ts then Power DVD will play the file.