Make some assumptions on channels, like 6 channels is 5.1 etc.
Ref #1897
d0afa7f avcodec:multichannel encoding support
modules/codec/avcodec/encoder.c | 98 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 97 insertions(+), 1 deletion(-)
Upstream: git.videolan.org