mplayer选择声道

wcw

使用smplayer播放一个rmvb文件时出现了中韩2种声音，工具栏上面有个stereo mode改了之后还是没有反应。查了网上，有人说用mplayer -stereo 2/1/0 也不行，可能这种方法只适用与mkv文件。
后来发现用一下方法解决：
左声道：
mplayer -af channels=1:1:1右声道：
mplayer -af channels=1:1
看了下man，还真是复杂：
  channels=nch[:nr:from1:to1:from2:to2:from3:to3:...]
              Can be used for adding, removing, routing and copying audio
              channels.  If only  is given the default routing is used,
              it works as follows: If the number of output channels is bigger
              than the number of input channels empty channels are inserted
              (except mixing from mono to stereo, then the mono channel is re‐\n              peated in both of the output channels).  If the number of output
              channels is smaller than the number of input channels the ex‐\n              ceeding channels are truncated.
                 
                      number of output channels (1-6)
                 
                      number of routes (1-6)
                 
                      Pairs of numbers between 0 and 5 that define where to
                      route each channel.
              EXAMPLE:
                 mplayer -af channels=4:4:0:1:1:0:2:2:3:3 media.avi
                      Would change the number of channels to 4 and set up 4
                      routes that swap channel 0 and channel 1 and leave chan‐\n                      nel 2 and 3 intact.  Observe that if media containing
                      two channels was played back, channels 2 and 3 would
                      contain silence but 0 and 1 would still be swapped.
                 mplayer -af channels=6:4:0:0:0:1:0:2:0:3 media.avi
                      Would change the number of channels to 6 and set up 4
                      routes that copy channel 0 to channels 0 to 3.  Channel
                      4 and 5 will contain silence.
反正我是没看懂，太专业了。暂且先用着吧


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