lav2wav(1) [debian man page]

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
       processing 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-bitsize
	    (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
       begining  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 anyway 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  creates
       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)

jpeg2yuv(1)							MJPEG tools manual						       jpeg2yuv(1)

NAME

       jpeg2yuv - Convert jpeg images to the yuv format.

SYNOPSIS

       jpeg2yuv [-b num] [-f num] [-I num] [-A ratio] [-L num] [-n num] [-l num] [-j filename]

DESCRIPTION

       jpeg2yuv decompresses a sequence of JPEG files and pipes the image data to stdout as a YUV4MPEG2 stream.  Any JPEG format supported by lib-
       jpeg can be read.  stdout will be filled with the YUV4MPEG2 movie data stream, so be prepared to pipe it on to mpeg2enc or to write it into
       a file.

OPTIONS

       jpeg2yuv accepts the following options:

       -b num
	    Frame offset:  skip output of the first 'num' frames.  (default: 0)

       -f num
	    Set the frame rate of stream accepts the same numbers.  No default, this option has to be specified.

       -A ratio
	    Sample aspect ratio.  Default is square pixels (1:1)

       -I num
	    interlacing mode: p = none / progressive
	    t = top field first
	    b = bottom field first
	    No default, this option has to be specified.

       -L num
	    0 = non-interlaced (two successive fields per JPEG file)
	    1 = interlaced fields

       -l num
	    Specifies the number of loops (default: 0 loops )
	    When  this	option	is  not used the given range of images is only processed once. If you use this option with num of -1 jpeg2yuv will
	    loop forever writing the image to stdout. When you use n > 0 it will loop n-times till it finishes.

       -n num
	    Specifies the number of frames to process. (default: all = -1)

       -j {1}%{2}d{3}
	    Read JPEG frames with the name components as follows:
	     {1} JPEG filename prefix (e g: picture_ )
	     {2} Counting placeholder (like in C, printf, eg 06 ))
	     {3} File extension. Something like this: .jpg A correct description of the files could look like this: picture_%06d.jpg

	    If this option is omited, the filenames are read from stdin. For example:
	     $ls *jpg | jpeg2yuv -f 25 -I p > result.yuv

       -R 1 or 0
	    rescale YUV color values from 0-255 to 16-235 (default: 1)

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

BUGS

       The frame rate description seems not to be up to date. The NTSC integer ratios seem not to be supported. As a workaround specify a PAL (25)
       or FILM (24) and set the right frame rate in mpeg2enc with the -F option.

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), mpeg2enc(1), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yuvmedianfilter(1), yuvscaler(1)

MJPEG Linux Square						  8 December 2001						       jpeg2yuv(1)