lav2wav man page on Mageia

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lav2wav(1)		      MJPEG tools manual		    lav2wav(1)

NAME
       lav2wav - Extract the audio out of MJPEG container files to stdout

SYNOPSIS
       lav2wav	[-s num] [-c num] [-v num] [-I] [-R] [-r samplerate, bitesize,
       channels] lavfile1 [lavfile2 ... lavfileN]

DESCRIPTION
       lav2wav can be used to extract the audio to stdout.  This  output  goes
       to stdout and can be saved as a wav file or piped to another sound pro‐
       cessing tool that is able to handle the wav format.  This can be mp2enc
       and  toolame for mpeg layer 2 audio, or for example lame for mpeg layer
       3 audio.

       The input files may be any combination of AVI (.avi),  Quicktime	 (.qt)
       or  editlist  files  so	long  as they are all lavtools- readable (e.g.
       MJPEG-encoded AVI/Quicktime or DV type 2 AVI).

OPTIONS
       lav2wav accepts the following options:

       -s num
	    Start extracting at video frame (num)

       -c num
	    Extract (num) frames of audio

       -v num
	    Verbosity level (0, 1 or 2)

       -I   Ignore unsupported bitrates/bits per sample

       -R   If the file does  not  contain  any	 sound.	 lav2wav  will	create
	    silence  with  44100kHz  Sampelrate,  16  Bit  audio bitsize and 2
	    Chanels

       -r sr,bs,ch
	    If the file does not  contain  any	sound  lav2wav	will  generate
	    silence with the values you supply the samplerate (sr), audio-bit‐
	    size (bs) and channel (ch).

BUGS
       The "WAV" file format (technically: RIFF) is really very much less than
       ideal  for  a tool intended to be used in pipelines as lav2wav is.  The
       problem is that the header includes a field specifying  the  length  of
       the file.  This can't be filled in except by seeking back to the begin‐
       ing and over-writing.  If the output is unseekable (e.g. pipe)  lav2wav
       simply  writes  a  large	 length into the header and leaves it at that.
       Most tools like sox(1) or mp2enc(1) either ignore the length field any‐
       way or only give a warning.
       The  audio  length  is  inacurate  calculated  when  lav2wav  generates
       silence.	 This happens only if you have NTSC framerate and than it cre‐
       ates for every hour of video 1.1498sec too less of silence.

AUTHOR
       This man page was written by Bernhard Praschinger.
       If  you	have  questions, remarks, problems or you just want to contact
       the developers, the main mailing list for the MJPEG-tools is:
	 mjpeg-users@lists.sourceforge.net

       For more info, see our website at
	      http://mjpeg.sourceforge.net

SEE ALSO
       mjpegtools(1), mp2enc(1), sox(1)

MJPEG Linux Square		  2 June 2001			    lav2wav(1)
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