I think Louis that refferred to an addon suite of software , developed by MAIN CONCEPT for Adobe, to be used in PPro CS6, ( Rovi TotalCode - Integrates in PPro, EN and AE ).
After the installation of this addon, very expensive for the information here. It costs around US900,(complete version with cinema resources and codecs ), so PPro, EN , AE will happily works with MPEG and in addition enlarges the use of CUDA cores in NVIDIA video boards for accelerated encoding. Only AA CS6 did not use natively MPEG2. Still maintain the original file support.
I do not know for sure if this the solution Louis mentioned. But this was the solution we encounter here in our studio. For us , resolved the MPG2 issue.