Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
pcmfade(1)		    General Commands Manual		    pcmfade(1)

NAME
       pcmfade - create	a fade-in or fade-out in a PCM file

SYNOPSIS
       pcmfade 0%-offset 100%-offset file

DESCRIPTION
       pcmfade	can be used to create a	fade-in	(0%-offset < 100%-offset) or a
       fade-out	(0%-offset > 100%-offset) in a raw PCM audio file.

OPERANDS
       The following operands are supported:

       0%-offset
	      Specify the file offset at which the volume should be  faded  to
	      0% (i.e. silence).

       100%-offset
	      Specify  the  file  offset  at which the volume should reach the
	      original level.

       file   The file to work with.  The file must be a raw PCM  audio	 file:
	      linear  signed  16  bits,	 stereo,  44.1	kHz,  intel byte order
	      (``little	endian'').  This is also known as ``CD quality'' audio
	      format.  It is created by	tosha(1), for example.

       WARNING:	 The file is modified in-place.	 If the	original file contents
       need to preserved, you must make	a backup copy before using pcmfade!

OFFSETS
       File offsets can	be specified in	two ways: as time stamp, or as	sample
       count.	Note: 1	sample = 4 bytes (16 bits left and 16 bits right).  In
       both cases, the offset can be relative to the beginning of the file, or
       (if prefixed with a minus sign) relative	to the end of the file.	 Thus,
       the offset syntax is:

       [-] [minutes] : seconds | [-] samples

       minutes
	      is an integer value, which may be	omitted.  The default value is
	      0.  Note that the	colon may not be omitted, because it indicates
	      the time stamp syntax.  if the colon is missing,	the  value  is
	      assumed to be a sample count, not	a time stamp.

       seconds
	      is  an  integer  or floating point value.	 It can	be larger than
	      60, for example ``1:80'' is the same as ``2:20'',	and ``:120.5''
	      is the same as ``2:00.5''.

       samples
	      is  an integer value (1 sample = 4 bytes).  There	are 44100 sam-
	      ples per second.

       If no sign is specified,	the offset is assumed to be  relative  to  the
       beginning of the	file.  If a minus sign is present, the offset is rela-
       tive to the end of the file.  For example, if the length	of the file is
       four minutes, ``-1:15'' specifies the same offset as ``2:45''.

SEE ALSO
       tosha(1), pcmplay(1), sox(1), intro(1)

BUGS
       Yes.  This is an	alpha version.

AUTHOR
       Copyright (C) 1997-1999
       Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>
       All  rights  reserved.	For more information, please refer to the file
       LICENCE which is	included with the source distribution.

       Internet	references:
       http://www.heim3.tu-clausthal.de/~olli/tosha/
       That's the homepage of the CD-DA	reader tosha(1)	 which	also  contains
       the latest version of pcmfade.

				  21 May 1997			    pcmfade(1)

NAME | SYNOPSIS | DESCRIPTION | OPERANDS | OFFSETS | SEE ALSO | BUGS | AUTHOR

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=pcmfade&sektion=1&manpath=FreeBSD+12.0-RELEASE+and+Ports>

home | help