mirror of https://github.com/mpv-player/mpv
update -channels to match observed behavior, patch by Corey Hickey < bugfood-ml AH fatooh POUM org >
From Thread: Date: Sep 2, 2005 5:25 AM Subject: Re: [MPlayer-DOCS] [PATCH] update -channels to match observed behavior git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16353 b3059339-0415-0410-9bf9-f77b7e298cf2
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@ -875,23 +875,16 @@ May be negative.
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Specify the CD-ROM device (default: /dev/\:cdrom).
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Specify the CD-ROM device (default: /dev/\:cdrom).
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.
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.
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.TP
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.TP
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.B \-channels <number>
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.B \-channels <number> (also see \-af channels)
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Change the number of playback channels (default: 2).
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Request the number of playback channels (default: 2).
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If the number of output channels is bigger than the number of input channels
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empty channels are inserted with the help of the channels audio filter (unless
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mixing from mono to stereo, then the mono channel is repeated in both
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output channels).
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The routing will be the default routing for the channels filter.
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If the number of output channels is smaller than the number of input channels,
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results depend on the audio decoder (\-afm).
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MPlayer asks the decoder to decode the audio into as many channels as
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MPlayer asks the decoder to decode the audio into as many channels as
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specified.
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specified.
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Now it's up to the decoder to fulfill the requirement.
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Now it's up to the decoder to fulfill the requirement.
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If the decoder outputs more channels than requested, the exceeding channels
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are truncated.
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This is usually only important when playing videos with AC3 audio (like DVDs).
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This is usually only important when playing videos with AC3 audio (like DVDs).
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In that case liba52 does the decoding by default and correctly downmixes the
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In that case liba52 does the decoding by default and correctly downmixes the
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audio into the requested number of channels.
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audio into the requested number of channels.
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To directly control the number of output channels independently of how many
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channels are decoded, use the channels filter.
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.br
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.br
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.I NOTE:
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.I NOTE:
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This option is honored by codecs (AC3 only), filters (surround) and audio
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This option is honored by codecs (AC3 only), filters (surround) and audio
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