Can't export MPEG-2 with alpha matte

Can't export an .mpeg 2 with an alpha from after effects using media encoder. Is there a way to do this? The editor I am working with only accepts MPEG 2 for his lower thirds.
Unfortunately I do not have a choice of formats and have to export MPEG 2 with an alpha. Easy enough with QuickTime and .Avi but have not seen an option with MPEG 2 in either after effects or encoder.

No prob's
1. Ensure that compressor is installed on your system.
2. Export the sequence as a Quicktime movie using sequence settings.
3. Launch compressor and bring your exported sequnce in, now you can apply one of the presets and, over time, read the manual and understand all of the subtleties of compression.
Tony

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