FFMEG won't transcode from 7.1 AAC to 7.1 eAC3

Have been trying to convert my video files from AAC to eAC3. I don't have Adobe Media Encoder, and am trying to do this with FFMPEG. Any help is

Note: I have copies of the following software that may be of use:

• Logic Pro 10.1.1
• Final Cut Pro
• Adobe Premiere Pro CC 2015 (without Adobe Media Encoder)
• VLC
• FFMPEG (Command Line)
• Handbrake

I have been using ffmpeg -i input-with-aac-7.1-audio.mkv -c:a eac3 -c:v copy output-eac3.mkv to attempt a transcode, but it forces the mixdown to 5.1

Thanks for any help in advance,

B

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