lavplay - Playback and edit MJPEG video


   lavplay [options] lavfile1 [lavfile2 ... lavfileN]


   lavplay can be used to playback video in MJPEG format (either quicktime
   or AVI) on a zoran video-capture  device,  such  as  the  Miro/Pinnacle
   DC10(+), the Iomega Buz or Linux Media Labs' LML33, or in software mode
   (using SDL).

   It also provides mechanisms for non-destructive editting video using an
   interactive front-end such as glav(1).  See SEARCHING AND EDITING below
   for details.


   lavplay accepts the following options:

   -p/--playback [S|C|H]
           The playback mode to be used. 'S' means software-playback using
            'H'  means  hardware-playback  on the monitor (on-screen). 'C'
           means hardware-playback to the video-out of  the  zoran  video-
           capture  device.  Obviously, 'C' and 'H' only work on computers
           with zoran video-capture devices.

           Full-screen playback. This works if SDL-  or  onscreen-playback
           is chosen.

   --size NxN
           Size  of  the  video  window (default: size of the input video)
           when using software (SDL) or hardware onscreen playback

   -a/--audio num
           When play audio, 0 means never, or sum of
             1: while playing forward,
             2: while playing reverse,
             4: even fast playing,
             8: while pausing
           (default:  7:   forward/reverse/fast).    If   8(pausing)   was
           contained, lavplay will be very noisy, but useful when you want
           to edit by sound.

           Zooms the video to fit the screen as good as possible.

   -x      Exchange fields of an interlaced video. Try this if  the  video
           looks  weird.   It  shouldn't  be necessary with stuff captured
           using lavrec(1) but could be needed for other sources.

   -s/--skip num
           Skip <num> seconds of video at the beginning.

           Invert field order (for videos which are  recorded  with  wrong
           field order interlacing settings)

           Disable  stills  flicker reduction.  This is useful if you want
           to see  stills  exactly  as  they  were  recorded  rather  than

   -c/--synchronization [0|1]
           Enables  (1)  or  disables  (0)  the  use  of sync corrections.
           Basically, you almost certainly want this.  Disabling is really
           there for diagnostic purposes and not much else.

   -H/--H-offset num, -V/--V-offset num
           Horizontal  (-H)  and vertical (-V) offset when using hardware-
           playback.  Offset plus width or height should be  smaller  than
           or  equal to the playback device's maximum allowed size (DC10+:
           640x480 or 768x576, LML33/Marvel/Buz: 720x480/576).

   --s-x-offset num, --s-y-offset num
           Offset for the video window (from top left screen corner)  when
           using hardware onscreen playback in non-fullscreen mode.

   --display :x.x
           When  using  hardware  fullsreen  video  playback  (-pH),  this
           setting can be used to  specify  the  video  display  (default:
           :0.0) to use for video display.

           Makes lavplay stay alive at the end of the video (lavplay won't
           quit).  Use 'q<enter>' on the command line to quit (see  below,

           Enables  GUI-mode. This is used by glav and Linux Video Studio.
           It will output the current position in the video each frame, so
           that  the  glav  or  LVS  can keep track of where we are in the
           video which is being played back.

           This is used by glav and Linux Video  Studio.   When  editlists
           are  created  the original pathnames for files are used and not
           the canonicalised pathnames from the root directory.  Useful if
           you've   got   things   like   automounters  active  that  make
           directories with the same  non-canonical  name  have  different
           canonical names on different machines.

           Use  the write() system call rather than the mmap() system call
           for audio writing to the sound  device.    This  may  fix  some
           audio playback problems.

   -n/--mjpeg-buffers num
           Number  of  MJPEG-buffers.  Default  is  32.  Try changing this
           number if you have many lost frames.

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


   The following environment variables can be recognized by lavrec:

           The video device. Default is /dev/video

           The audio device. Default is /dev/dsp


   lavplay can do more than simple plain playback. It is also intended  to
   be  controlled  using  commands  sent  via  stdin from a front-end like
   glav(1) or similar, more sophisticated  tools.   The  most  significant
   aspect  of  this functionality is the ability to create edit list files
   giving the playback sequence of an editted version of the input  video.
   The  edit  list file can be read by any of the mjpegtools(1) (including
   lavplay!) wherever an actual video file would be acceptable.  Such edit
   lists record only the original source file and start and stop frames of
   the components of the editted video  editting  rather  than  the  video
   itself.   As  such  editting  leaves  the  original files unchanged and
   requires only tiny amounts of data-movement.  The drawback is that  for
   the  edit  list  to  work the original files must remain unchanged, and
   that interactive play  may  be  jumpy  due  to  the  playback  sequence
   "skipping   about"  between  different  parts  of  the  original  video

   If a stand-alone consolidated versions of editted video is required  it
   can be produced by running the lavtrans(1) utility on the edit list.

   Edit  list files are plain text with a very simple syntax to allow easy
   manual editting using a text-editor or  writing  of  scripted  editting


   The  commands  accepted  on  standard  input sre as follows (and can of
   course be entered directly by command-line junkies):

   +, -    Goes to next/previous frame. Only makes sense when the video is

   pN      Sets playback speed to N (N=..., -1, 0, 1, ...)

   a[01]   Enables/disables audio playback

   sN      if N is a number, this means to go to frame N. if N is prefixed
           by a + or -, this means to go N frames back- or forward.

   om editlist [N1 N2 [N3 N4]]
           Opens a movie or editlist. A  second  and  third  argument  can
           specify to only open a specific range of frames from this video
           (N1=-1 means whole video). N3 and N4 can specify to show only a
           specific range of frames from the frames which were just opened
           (useful for trimming).

   w[as] file
           Save the current editlist (a) or the current selection (s) to a

   q       Quit lavplay.

   e[ou] N1 N2
           Cuts  (u)  or copies (o) frames N1-N2 from the current editlist
           into an internal selection.

   ep      Pastes the contents of the selection into the current  position
           in the editlist.

   em N1 N2 N3
           Moves frames N1-N2 to position N3 in the video.

   ed N1 N2
           Deletes frames N1-N2 from the editlist.

   ea video N1 N2 N3
           Adds  frames  N1-N2  of  the  video into position N3 within the
           editlist.  N1=-1 means to add the whole video.

   es N1 N2
           Sets the current viewable frames  within  the  whole  video  to
           N1-N2. This is useful for trimming.


   Editlists  record  absolute pathnames.  This more or less forces manual
   editting of the pathnames in them if it is desired  to  move  editlists
   and source video files.

   lavplay  really  ought  to make a decent job of detecting what playback
   options are feasible  (on-screen  hardware,  video-out  port  hardware,
   software)  and  set  the default playback mode appropriately.  Alas, it
   does not.


   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:
   For more info, see our website at


   mjpegtools(1), lavrec(1), glav(1)


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