1.8.1

Rubber Band An audio time-stretching and pitch-shifting library and utility program. Copyright 2007-2012 Particular Programs Ltd. Usage: rubberband [options] <infile.wav> <outfile.wav> You must specify at least one of the following time and pitch ratio options. -t<X>, --time <X> Stretch to X times original duration, or -T<X>, --tempo <X> Change tempo by multiple X (same as --time 1/X), or -T<X>, --tempo <X>:<Y> Change tempo from X to Y (same as --time X/Y), or -D<X>, --duration <X> Stretch or squash to make output file X seconds long -p<X>, --pitch <X> Raise pitch by X semitones, or -f<X>, --frequency <X> Change frequency by multiple X -M<F>, --timemap <F> Use file F as the source for key frame map A map file consists of a series of lines each having two numbers separated by a single space. These are source and target sample frame numbers for fixed time points within the audio data, defining a varying stretch factor through the audio. You must specify an overall stretch factor using e.g. -t as well. The following options provide a simple way to adjust the sound. See below for more details. -c<N>, --crisp <N> Crispness (N = 0,1,2,3,4,5,6); default 5 (see below) -F, --formant Enable formant preservation when pitch shifting The remaining options fine-tune the processing mode and stretch algorithm. These are mostly included for test purposes; the default settings and standard crispness parameter are intended to provide the best sounding set of options for most situations. The default is to use none of these options. -L, --loose Relax timing in hope of better transient preservation -P, --precise Ignored: The opposite of -L, this is default from 1.6 -R, --realtime Select realtime mode (implies --no-threads) --no-threads No extra threads regardless of CPU and channel count --threads Assume multi-CPU even if only one CPU is identified --no-transients Disable phase resynchronisation at transients --bl-transients Band-limit phase resync to extreme frequencies --no-lamination Disable phase lamination --window-long Use longer processing window (actual size may vary) --window-short Use shorter processing window --smoothing Apply window presum and time-domain smoothing --detector-perc Use percussive transient detector (as in pre-1.5) --detector-soft Use soft transient detector --pitch-hq In RT mode, use a slower, higher quality pitch shift --centre-focus Preserve focus of centre material in stereo (at a cost in width and individual channel quality) -d<N>, --debug <N> Select debug level (N = 0,1,2,3); default 0, full 3 (N.B. debug level 3 includes audible ticks in output) -q, --quiet Suppress progress output -V, --version Show version number and exit -h, --help Show this help "Crispness" levels: -c 0 equivalent to --no-transients --no-lamination --window-long -c 1 equivalent to --detector-soft --no-lamination --window-long (for piano) -c 2 equivalent to --no-transients --no-lamination -c 3 equivalent to --no-transients -c 4 equivalent to --bl-transients -c 5 default processing options -c 6 equivalent to --no-lamination --window-short (may be good for drums)