ref: 1b81de20e70954295685a40d7cde24a62dac9cac
dir: /man1audio-opus/
diff -r b14fe5260932 sys/man/1/audio --- a/sys/man/1/audio Mon Jan 11 16:58:04 2021 +0100 +++ b/sys/man/1/audio Tue Jan 12 00:22:23 2021 +0100 @@ -29,6 +29,13 @@ ] .br .B audio/sundec +.br +.B audio/opusdec +[ +.B -h +] [ +.I options +] .PP .B audio/oggenc .br @@ -76,6 +83,13 @@ .B -T .I field=value ] +.br +.B audio/opusenc +[ +.B -h +] [ +.I options +] .PP .B audio/pcmconv [ @@ -128,11 +142,12 @@ The encoders read PCM on standard input and produce compressed audio on standard output. .PP -.I Flacenc, -.I oggenc +.IR Flacenc , +.IR oggenc , +.IR opusenc , and .I mp3enc -produce FLAC, OGG Vorbis and MP3 audio. For +produce FLAC, OGG Vorbis, OGG Opus and MP3 audio. For .I mp3enc, the MP3 file will use `constant bit-rate' (CBR) encoding by default, but that can be changed via @@ -141,8 +156,11 @@ or .BR -v (variable bitrate, VBR). +.I Opusenc +uses VBR by default. .PP -.I Flacenc +.IR Flacenc , +.I opusenc and .I oggenc accept raw PCM in the same byte order as @@ -275,6 +293,20 @@ .B --voice experimental voice mode .SS +Like +.IR mp3enc , +opusenc accepts a number of long options to configure encoding parameters, +input options and metadata. +By default, it assumes raw PCM in the same byte order as +.B /dev/audio +with a 44.1KHz sampling rate and two channels. +Similarly, +.I opusdec +will output that same format by default. +Known knobs for both programs can be displayed with the +.B -h +option. +.SS .I Pcmconv is a helper program used to convert various PCM sample formats. The .B -i @@ -387,6 +419,12 @@ .EX dd -conv swab | audio/mp3enc -a -r -m m --resample 16 -b 24 .EE +.LP +Transcoding a FLAC file to Ogg Opus with slightly higher quality settings than default: +.IP +.EX +audio/flacdec <foo.flac | audio/opusenc --music --downmix-stereo --bitrate 128 >foo.opus +.EE .SH SOURCE .B /sys/src/cmd/audio .SH "SEE ALSO"