xbmc/xbmc — pull request #4863 by popcornmix (2014-06-07 18:28:54+00:00)
Title: [omxplayer] Remove PCMRemap and handle multichannel mixing like ActiveAE

omxplayer uses pre-ActiveAE code for determining multichannel mixing.
Some of the decisions made with lfe and side/back channels are different.

I think it is better to match latest xbmc code exactly, and so use
ffmpeg to determine the mixing matrix in the same way as Pi Sink does.