MPEG-2, MPEG2-DVD, MPEG-2-Blu-ray, and MXF OP1a are missing from the format pop-up menu in Adobe Media Encoder CS6. Dolby Digital is also missing as an audio codec if you choose one of the H.264 presets.
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Install the latest update to the Adobe Media Encoder, 6.01 or later.
To download the update, choose Help > Updates from within any of the CS6 products and follow the onscreen instructions.
Alternatively, you can download the Adobe Media Encoder 6.01 update directly from the following locations: