How to apply DRC to DD+ Audio

 You may have a 5.1 Dolby Digital Plus (E-AC3) audio track lying around, that you want to apply Dynamic Range Compression to while transcoding it?

Well, the eac3to tool does not seem to help here, so here is an alternative: use FFMPEG!

The command line would look like:

ffmpeg -drc_scale X -i input.mp4 output.wav

where X = The DRC ratio you want to apply. 2 or 3 is a good value here.

Now you can take that WAV output and transcode it to whatever format you like :)