Some people who have downloaded Adobe Media Encoder with Premiere Pro CS6 as part of a Creative Cloud Membership subscription have a problem in which the MPEG2, MPEG2-DVD, MPEG2-Blu-ray, Dolby Digital, & MXF OP1a codecs are missing.
To fix this issue, install the Adobe Media Encoder CS6 (6.0.1) update.
I downloaded the update and it worked. but when I went to reopen the project the problem is back. Only happened in Premiere pro CS6. 6.0.1 and 6.0.0 The media Encoder works now but Premiere Pro has the annoying error that causes you use older versions to work with MPEG2 files. So all my XF100 footage is no good to edit. Big bummer for me here.
The error reads as fallowing: This project contained a sequence that could not be opened. No sequence preview preset file or codec could be associated with this sequence type.