mp3enc - create mp3 audio files games/mp3enc [ -hprv ] [ -b bitrate ] [ -B bitrate ] [ -m mode ] [ -q q ] [ -s sfreq ] [ -V q ] [ "long or silly options" ] Mp3enc compresses audio on standard input, normally PCM-encoded, and produces MP3-encoded audio on standard output. By default, the MP3 file will use `constant bit-rate' (CBR) encoding, but that can be changed via --abr (average bitrate desired, ABR) or -v (variable bitrate, VBR). .TF "-b "

-b set minimum allowed bitrate in Kb/s for VBR, default 32Kb/s. For CBR, set the exact bitrate in Kb/s, which defaults to 128Kb/s.

-B set maximum allowed bitrate in Kb/s for VBR, default 256Kb/s.

-h same as .LR "-q 2" .

-m mode may be (s)tereo, (j)oint, (f)orce or (m)ono (default j). force forces mid/side stereo on all frames.

-p add CRC error protection (adds an additional 16 bits per frame to the stream). This seems to break playback.

-q sets output quality to q (see -V ).

-r input is raw pcm

-s set sampling frequency of input file (in KHz) to sfreq , default is 44.1.

-v use variable bitrate (VBR) encoding

-V set quality setting for VBR to q . Default q is 4; 0 produces highest-quality and largest files, and 9 produces lowest-quality and smallest files.

.TF "--resample sfreq "

--abr " bitrate" sets average bitrate desired in Kb/s, instead of setting quality, and generates ABR encoding.

--resample " sfreq" set sampling frequency of output file (in KHz) to sfreq , default is input sfreq.

--mp3input input is an MP3 file .

.TF --nohist

-f same as .LR "-q 7" . Such a deal.

-o mark as non-original (i.e. do not set the original bit)

-c mark as copyright

-k disable sfb=21 cutoff

-e " emp" de-emphasis n/5/c (default n)

-d allow channels to have different blocktypes

-t disable Xing VBR informational tag

-a autoconvert from stereo to mono file for mono encoding

-x force byte-swapping of input (see dd (1) instead)

-S don't print progress report, VBR histograms

--athonly only use the ATH for masking

--nohist disable VBR histogram display

--voice experimental voice mode .

Encode a .L .wav file as highest-quality MP3. .EX games/mp3enc -q 0 -b 320

Create a fixed 128Kb/s MP3 file from a .L .wav file.

.EX games/mp3enc -h <foo.wav >foo.mp3

Streaming from stereo 44.1KHz raw PCM data, encoding mono at 16KHz (you may not need dd ):

.EX dd -conv swab | games/mp3enc -a -r -m m --resample 16 -b 24 /sys/src/games/mp3enc dd (1), mp3dec (1), audio (3), cdfs (4), audio (7), juke (7), playlistfs (7)

http://www.sulaco.org/mp3

Quality is much better than encoders based on the ISO routines, but still not as good as the FhG encoder.

It's a GNU behemoth, lightly rehabilitated. There are zillions of undocumented options.