Channel order

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Different codecs have different channel orders:

SMPTE Order

L C R Ls Rs LFE

Film Order

L R C LFE Ls Rs


FLAC Order

http://flac.sourceforge.net/format.html#frame_header (see <4>)

Channel assignment 
0000-0111 : (number of independent channels)-1. Where defined, the channel order follows SMPTE/ITU-R recommendations. The assignments are as follows: 
1 channel: mono
2 channels: left, right
3 channels: left, right, center
4 channels: left, right, back left, back right
5 channels: left, right, center, back/surround left, back/surround right
6 channels: left, right, center, LFE, back/surround left, back/surround right
7 channels: not defined
8 channels: not defined
1000 : left/side stereo: channel 0 is the left channel, channel 1 is the side(difference) channel 
1001 : right/side stereo: channel 0 is the side(difference) channel, channel 1 is the right channel 
1010 : mid/side stereo: channel 0 is the mid(average) channel, channel 1 is the side(difference) channel 
1011-1111 : reserved