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-rw-r--r-- | DOCS/mplayer.1 | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/DOCS/mplayer.1 b/DOCS/mplayer.1 index 70313d81e0..fe7ffb93c4 100644 --- a/DOCS/mplayer.1 +++ b/DOCS/mplayer.1 @@ -394,17 +394,23 @@ May be negative. . .TP .B \-channels <number> -Change the number of playback channels. +Change the number of playback channels, defaults to '2' if not specified. 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 repeated in both of the output channels). -If the number of output channels is smaller than the number of input channels -the exceeding channels are truncated. +empty channels are inserted (unless mixing from mono to stereo, then the mono +channel is repeated in both output channels). +If the number of output channels is smaller than the number of input channels, +results depend on the audio decoder (\-afm). +Mplayer asks the decoder to decode the audio into as many channels as +specified. Now it's up to the decoder to fulfill the requirement. If the +decoder outputs more channels than requested, the exceeding channels are +truncated. This is usually only important when playing videos with AC3 audio +(like DVDs). In that case liba52 does the decoding by default and correctly +downmixes the audio into the requested number of channels. .I NOTE: .br -This option is honored by codecs (ac3 only) filters (surround) and ao drivers -(oss at least). +This option is honored by codecs (AC3 only) filters (surround) and ao drivers +(OSS at least). .br Available options are: |