lavplay
SYNOPSIS
lavplay [options] lavfile1 [lavfile2 ... lavfileN]
DESCRIPTION
lavplay can be used to playback video in MJPEG format
(either quicktime, movtar 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.
OPTIONS
lavplay accepts the following options:
-p/--playback [S|C|H]
The playback mode to be used. 'S' means soft
ware-playback using SDL. 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.
-Z/--full-screen
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.
-z/--zoom
Zooms the video to fit the screen as good as pos
sible.
-x Exchange fields of an interlaced video. Try this
with wrong field order interlacing settings)
-F/--flicker
Disable stills flicker reduction. This is useful
if you want to see stills exactly as they were
recorded rather than flicker-free!
-c/--synchronization [0|1]
Enables (1) or disables (0) the use of sync cor
rections. 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.
-q/--no-quit
Makes lavplay stay alive at the end of the video
(lavplay won't quit). Use 'q<enter>' on the com
mand line to quit (see below, SEARCHING AND EDIT
ING).
-g/--gui-mode
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.
-P/--preserve-pathnames
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 directo
ries with the same non-canonical name have differ
LAV_VIDEO_DEV
The video device. Default is /dev/video
LAV_AUDIO_DEV
The audio device. Default is /dev/dsp
SEARCHING AND EDITING
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 sophisti
cated tools. The most significant aspect of this func
tionality 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 inter
active play may be jumpy due to the playback sequence
"skipping about" between different parts of the original
video sequence.
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 writ
ing of scripted editting tools.
STDIN COMMANDS
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 paused.
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.
e[ou] N1 N2
Cuts (u) or copies (o) frames N1-N2 from the cur
rent editlist into an internal selection.
ep Pastes the contents of the selection into the cur
rent 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.
BUGS
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.
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), lavrec(1), glav(1)
MJPEG Linux Square 6 December 2001 lavplay(1)
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