[FFmpeg-devel] [PATCH] rematrix DPLII fix for channel downmixing. Surround now adds to front rather than taking away.

[Peter Robertson]

This fixes a problem where trying to convert gameplay sound to Dolby Pro
Logic II would result in a left channel that would be missing the sounds
that were in center and back left at the same time. I also applied it to
Dolby Pro Logic as it should work the same way. Sorry if I've done
anything wrong, first patch. Fixes #3455

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