[opus] Master Audio 5.1 to Opus 2.0 conversion & Center Channel

[Kevin Felker]

When it comes to Movie surround audio, the center channel carries the bulk
of the speech.  I'm converting 5.1/7.1 Master Audio tracks to 2.0 Opus.

Is there a way to boost the center channel when converting 5.1/7.1 Master
Audio to 2.0 Opus?

I don't hear that well when it's playing a lot of music, and I tried the
"-application VOIP" when encoding MA to 128-192kpbs 2.0.
It makes no difference, and I figured boosting the center channel would be
true hands on.

I don't see anywhere in your encoding rules that allow channel manipulation.
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