This is the command qwavfade that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
qwavfade - fade in/out wav files
SYNOPSIS
qwavfade [option]... file...
DESCRIPTION
qwavfade modifies a wav file applying on it a fade in or a fade out or both.
a fade consists in modifying progressively the level of the wav as if you were slowly
increasing or decreasing the volume. a fade in consists in increasing the volume starting
from a low level at the beginning of the wav. a fade out consists in decreasing the volume
to a low level at the end of the wav.
OPTIONS
-d <duration>[<format>], --duration=<duration>[<format>]
duration is a positive integer that specifies the duration of the fade. the value
is treated as a sample number unless a format specifier is used. see the FORMATS
section below for information. the default value is five seconds. this option
overrides the --length option explained below.
-h, --help
show a brief help and exit.
-i, --in
just fade in. don't fade out. by default, fade in and fade out.
-l <time point>, --length=<time point>
time point specifies the length(=duration) of the fade. see the TIME POINTS section
below for information. this option is quite similar to the --duration option above.
its easier to use though not as powerful than the previous one. the default value
is five seconds. this option overrides the --duration option explained above.
-o, --out
just fade out. don't fade in. by default, fade in and fade out.
-t, --test
this option can be used to create and fade a tests files instead of modifying to
original file. a test file will be created for each type of selected fade (in or
out). the name of the test file will be fadein.<file> or fadeout.<file. the
duration of the test files is the fade duration plus two seconds.
-v, --verbose
show more detailed info.
-V, --version
show version and exit.
TIME POINTS
the time points is a easier way to specify the length (or duration) of a fade with a
millisecond resolution. here's its formal form:
[h:[m:]]s[.ms] where
h value is a positive integer meaning hours.
m value is a positive integer meaning minutes.
s value is a positive integer meaning seconds.
ms value is a positive integer meaning milliseconds.
only the seconds specifier is required. here are a couple of examples:
1:23:45.67
2:0.001
FORMATS
the --duration option can have also an optional modifier. if this modifier is not used,
then the value provided with the corresponding cut option will be interpreted as a number
of samples. since most of the times will be difficult to specify a duration in terms of
samples, the following modifiers are provided:
j value is interpreted as milliseconds.
m value is interpreted as minutes.
s value is interpreted as seconds.
b value is interpreted as bytes.
k value is interpreted as kbytes (1024 bytes).
M value is interpreted as megabytes (1024 kbytes).
in either case, the values specified will be rounded to get an integer number of samples.
EXAMPLE
suppose you want to fade in and out the fantastic song live.in.concert.wav using a fade
duration of 5 seconds:
first we are going to test:
qwavfade -t -d 7s live.in.concert.wav
hear the test fades:
my-favourite-wav-player fadein.live.in.concert.wav
my-favourite-wav-player fadeout.live.in.concert.wav
if you want to try with another duration, jump to the first step and change the duration
argument.
and if you're happy with the tests:
qwavfade -d 5s live.in.concert.wav
NOTES
qwavfade doesn't allow both types of fades (in and out) to overlap. if you want to fade in
and out a wav file, and the two regions to fade overlap, then probably you made a mistake.
in any case, you can do it fading separately.
Use qwavfade online using onworks.net services