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lavrec




SYNOPSIS

       lavrec [options] filename(s)


DESCRIPTION

       lavrec can be used to record video in MJPEG format (either
       quicktime,  movtar  or  AVI)  from  a  zoran video-capture
       device, such as the Miro/Pinnacle DC10(+), the Iomega  Buz
       or  Linux Media Labs' LML33, or from a generic video4linux
       device, such as the cheap Bt848 or  Bt878  based  TV-cards
       that are being sold in every computer shop around the cor­
       ner.


OPTIONS

       lavrec accepts the following options:

       filename
               The file to record to (*.avi, *.qt, *.movtar). Use
               a   %   to   record   to   multiple  files  (using
               file%02d.avi   will    record    to    file00.avi,
               file01.avi,  etc). You can also give more than one
               filename, which will have the  same  effect.  This
               will  avoid  problems  resulting  from filetype or
               filesystem size limits. AVI, for example, has a  2
               GB limit, as does ext2fs in 2.2.x kernels.

       --software-encoding
               By  default, lavrec will capture in a mode that is
               only suitable for recording  from  hardware  MJPEG
               devices.  Using  this  option will make lavrec use
               software-JPEG-encoding   (using   libjpeg)   which
               enables   MJPEG-video-capture  from  many  generic
               video4linux  devices  (such  as  Bt848/Bt878-based
               ones).

       -f/--format [a|A|q|m]
               The  format  in which the video should be saved to
               the harddisk.
                 a - MJPEG AVI
                 A - MJPEG AVI with fields exchanged
                 q - Quicktime
                 m - Movtar
               By default, lavrec will look at the  extension  of
               the  first file (*.avi, *.qt, *.movtar) and choose
               a format based on that.
                a - (or every other letter) Autosense (default)

       -d/--decimation num
               Recording  decimation, either 1, 2 or 4. This will
               decimate the size of the recorded  video  horizon­
               tally  and vertically. To use different horizontal
               and vertical decimations,  use  two  numbers,  the
               first  one being the horizontal and the second one
               being the vertical (-d 12).  Note: this option can
               only be used during hardware recording.

       -g/--geometry WxH(+X+Y)
               For   hardware   recording:  An  X-style  geometry
               string, giving the  geometry  of  the  undecimated
               subframe to record. The default is the full frame,
               so   720x576/480+0+0   for   Buz/LML33-users   and
               640x480+0+0 or 768x576+0+0 for DC10(+)-users.  For
               software recording: The size of the  video  to  be
               captured.   Currently, width and height need to be
               a multiple of 16.  You  always  capture  the  full
               frame since most video4linux devices donīt support
               subframe capture.

       -q/--quality num
               Quality of the JPEG-video to be recorded (in  per­
               cent).  This  must  be a number between 0 and 100.
               Lower quality should generally  mean  lower  file­
               size,  higher quality will take more diskspace but
               will give more detailed perfectness in the result­
               ing recorded video. Default is 50%.

       -C/--channel LIST:CHAN
               Choose  the  channel to record from (xawtv-style).
               By default, lavrec will just use  the  current  TV
               channel.

       -t/--time num
               Recording  time  in seconds. The default is unlim­
               ited. To stop capturing video while recording, use
               Ctrl-C.

       -S/--single-frame
               Single-frame capture mode. This means that one can
               capture individual frames from the capture device.


       -a/--audio-bitsize num
               Audio size in bits, either 0, 8 or 16 (default). 0
               means no audio.

       -r/--audio-bitrate num
               Audio sampling rate in Hz. This must be a sampling
               rate  which  is supported by the soundcard. Often-
               supported audio sampling rate  values  are  11025,
               22050 or 44100 (default).

       -s/--stereo
               Capture  in stereo. By default, lavrec captures in
               mono.

       -l/--audio-volume num
               Recording level. This must be a  value  between  0
               (no  sound) and 100 (loud recording). -1 (default)
               means to not touch the mixer settings at all.

       -m/--mute
               Mute sound output while  recording.  This  can  be
               useful when recording sound from the microphone to
               disable echos. This option is disabled by default.

       -R/--audio-source [l|m|c]
               Recording  source,  either (l)ine-in, (m)icrophone
               or (c)d-rom. The default is to record from line-in
               (l).

       -U/--use-read
               Use  the read() system call rather than the mmap()
               system call for audio recording. This may fix many
               audio recording problems.

       -c/--synchronization [0|1|2]
               Audio/video  synchronization  level  efforts.  (0)
               means no synchronization, (1)  means  that  lavrec
               will  replicate  frames for lost frames. (2) means
               that lavrec will replicate frames for lost  frames
               and do sync correction.  Default is 2.

       -n/--mjpeg-buffers num

       --file-flush num
               Flush the file to disk after every num frames cap­
               tured.

       -v/--verbose num
               Verbosity level (0, 1 or 2). Default is 0.


ENVIRONMENT

       The following environment variables can be  recognized  by
       lavrec:

       LAV_VIDEO_DEV
               The video device. Default is /dev/video

       LAV_AUDIO_DEV
               The audio device. Default is /dev/dsp

       LAV_MIXER_DEV
               The mixer device. Default is /dev/mixer


OUTPUT

       Lavrec will output the current recording state. Typically,
       this looks like:
       0.06.14:22 int: 00040 lst:0  ins:0  del:0  ae:0  td1=0.014
       td2=0.029
       The  first  part is the time that has been spent recording
       (hours - minutes - seconds - frames).  int is the interval
       (in milliseconds) between two captured frames (this should
       be around 40 for PAL/SECAM and 33 for NTSC).  lst  is  the
       number  of  lost  frames.   ins  and del are the number of
       frames inserted and deleted for sync  correction.   ae  is
       the   number  of  audio  errors.   td1  and  td2  are  the
       audio/video time-difference (out-of-sync'ness).


TYPICAL RECORDING SESSIONS

       Okay, that's a lot of options. Now how  would  I  normally
       record video?  Let's assume you want to record at VCD res­
       olution (352x288) from PAL source.  You  might  want  some
       higher  quality  than default (80%). You use default audio
       options and record to an AVI file. That having said,  your
       recording command line would look like:

       From hardware MJPEG devices (S-video input)
               lavrec --format=a --input=P --quality=80 --decima­
               tion=2 /path/to/file.avi

       From normal video4linux devices


AUTHOR

       This man page was written by Ronald Bultje.
       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), lavplay(1)

MJPEG Linux Square       6 December 2001                lavrec(1)

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