ref: 7d6d832eae980d69af1357c5a5db6129c10d3d01
dir: /man1audio-opus/
diff -r 856b7143c3eb sys/man/1/audio --- a/sys/man/1/audio Sun Jan 12 03:40:42 2020 +0000 +++ b/sys/man/1/audio Mon Jan 13 09:20:48 2020 +0100 @@ -14,6 +14,13 @@ .B audio/wavdec .br .B audio/sundec +.br +.B audio/opusdec +[ +.B -h +] [ +.I options +] .PP .B audio/oggenc .br @@ -40,6 +47,13 @@ ] [ .I "long or silly options" ] +.br +.B audio/opusenc +[ +.B -h +] [ +.I options +] .PP .B audio/pcmconv [ @@ -86,10 +100,11 @@ The encoders read PCM on standard input and produce compressed audio on standard output. .PP -.I Oggenc +.IR Oggenc , +.I mp3enc and -.I mp3enc -produce OGG Vorbis and MP3 audio. For +.I opusenc +produce OGG Vorbis, MP3, and OGG Opus audio. For .I mp3enc, the MP3 file will use `constant bit-rate' (CBR) encoding by default, but that can be changed via @@ -98,12 +113,16 @@ or .BR -v (variable bitrate, VBR). +.I Opusenc +uses VBR by default. .PP .I Oggenc -accepts raw PCM in the same byte order as +and +.I opusenc +accept raw PCM in the same byte order as .B /dev/audio (little-endian), -t +but .I mp3enc -r expects big-endian. .SS Options @@ -230,6 +249,20 @@ .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 @@ -342,6 +375,12 @@ .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"