MP4Client(1) GPAC MP4Client(1)NAME
MP4Client - GPAC MPEG-4 command-line Player
SYNOPSIS
MP4Client [options] [file]
DESCRIPTION
MP4Client is GPAC command-line player. It supports all GPAC playback
features (2D and 3D support, local playback, RTP streaming, HTTP fast‐
start, many audio and video codecs ...). MP4Client also supports visual
extraction to BMP, RAW or AVI (no compression, no audio).
STARTUP OPTIONS-c file
specifies config file to use. Default config file is located in
user home directory and created if not found.
-rti file
logs run-time information to file. Information logged is: FPS,
CPU, Memory usage.
-quiet removes script message, buffering and downloading status.
PLAYBACK OPTIONS
A file can be controled during playback by typing one of the following
key at prompt.
o connects to a new URL entered at prompt by user.
r restarts the current presentation
p plays/pauses the current presentation
s step one frame ahead in the current presentation
z seek into presentation. Seek percentage is entered at prompt
t prints current timing of the main timeline of the presentation
w prints world info of the current presentation
v prints list of all GF_ObjectDescriptor used in current presenta‐
tion.
i prints information of a given OD. Object ID is entered at
prompt.
b prints all objects timing and buffering info.
m prints all objects buffering and memory info.
d dumps current presentation scene graph to file or stdout.
k Turns stress mode on/off.
n Changes current navigation mode if possible/allowed. When a
Layer3D is selected, sets layer3D navigation if allowed.
x Reset to last active viewpoint. When a layer3D is selected,
resets layer3D viewpoint.
2 Reload MPEG-4 Client with GPAC 2D Renderer.
3 Reload MPEG-4 Client with GPAC 3D Renderer.
4 forces 4/3 Aspect Ratio.
5 forces 16/9 Aspect Ratio.
6 forces no aspect ratio (always fill screen).
7 forces original Aspect Ratio (default mode).
l prints the list of available plugins.
c prints some GPAC configuration info.
q quits the application.
C enables streaming cache.
S stops streaming cache and record it.
A stops streaming cache and discard it.
h prints list of available commands.
WINDOW SHORTCUTS
When MP4Client window has the focus, the following shortcuts are avail‐
able
Alt + right
Seeks 5% ahead from current time.
Alt + left
Seeks 5% before the current time
Alt + up
Increases volume by 5%
Alt + down
Decreases volume by 5%
HOME Resets navigation to last bound viewpoint/viewport
4, 5, 6, 7
Same as non-window values
ESCAPE , alt+return, doubleclick
Toggles fullscreen on/off.
ctrl + 'f'
Prints current rendering framerate.
ctrl + 'R'
Sends a redraw message (complete scene state recompute).
ctrl + 'P'
Play/Pause.
ctrl + 'S'
Step one frame ahead.
CONFIGURATION FILE
When launched for the first time, MP4Client will ask for a font direc‐
tory and a cache directory.
Font Directory
Indicates the absolute path to a directory containing a TrueType
font repository. In case this directory is not specified or does
not contain valid TrueType fonts, text will be disabled.
Cache Directory
Indicates the absolute path to a directory with write access to
store files retrieved through HTTP downloads. In case this
directory is not specified or has no write access HTTP downloads
won't work.
NAVIGATION
Navigation with MP4Client depends on the renderer type (2D or 3D) and
also on content - some content may disable user selectable navigation.
Walk & Fly modes
Mouse: Horizontal move: Horizontal pan - Vertical move: Z-trans‐
late - Vertical move+CTRL or Wheel: Vertical pan - Right Click
(Walk mode only): Jump Keys: left/right: Horizontal pan -
left/right+CTRL: Horizontal translate - up/down: Z-translate -
up/down+CTRL: Vertical pan
Pan mode
Mouse: Horizontal move: Horizontal pan - Vertical move: Vertical
pan - Vertical move+CTRL or Wheel: Z-translate Keys: left/right:
Horizontal pan - left/right+CTRL: Horizontal translate -
up/down: Vertical pan - up/down+CTRL: Z-translate
Slide mode
Mouse: Horizontal move: Horizontal translate - Vertical move:
Vertical translate - Vertical move+CTRL or Wheel: Z-translate
Keys: left/right: Horizontal translate - left/right+CTRL: Hori‐
zontal pan - up/down: Vertical translate - up/down+CTRL: Z-
translate
Examine & Orbit mode
Mouse: Horizontal move: Y-Axis rotate - Horizontal move+CTRL: No
move - Vertical move: X-Axis rotate - Vertical move+CTRL or
Wheel: Z-translate Keys: left/right: Y-Axis rotate -
left/right+CTRL: Horizontal translate - up/down: X-Axis rotate -
up/down+CTRL: Y-translate
Game mode (press END to escape)
Mouse: Horizontal move: H pan - Vertical move: Vertical pan
Keys: left/right: Horizontal translate - up/down: Z-translate
All 3D modes
CTRL+PGUP/PGDOWN will zoom in/out camera (field of view)
Slide Mode in 2D
Mouse: Horizontal move: Horizontal translate - Vertical move:
Vertical translate - V move+CTRL: zoom Keys: left/right: Hori‐
zontal translate - up/down: Vertical translate - up/down+CTRL:
zoom
Examine Mode in 2D (3D renderer only)
Mouse: Horizontal move: Y-Axis rotate - Vertical move: X-Axis
rotate Keys: left/right: Y-Axis rotate - up/down: X-Axis rotate
SHIFT
VISUAL EXTRACTION OPTIONS
When used to dump a visual presentation, the client is no longer inter‐
active. All GPAC features are supported during capture, except audio-
related ones. The following options can be passed at prompt:
-bmp [times]
dumps the specified frames to BMP format. If no time is speci‐
fied, capture is made at t=0s. time is given in millisecond, as
an SMPTE time code or as HH:MM:SS:MS time code. You may specify
several frame times by using a dash-separated list of times (eg,
'0-10-15').
-raw [times]
dumps the specified frames to RAW format. If no time is speci‐
fied, cpature is made at t=0s.
-avi start:end
dumps the specified segment to uncompressed AVI format.
-fps rate
specifies frame rate for AVI dumping. Default frame rate is
25.0.
-size WxH
specifies frame size for dumping. Default frame size is the
scene size.
-fill uses fill aspect ratio. By default, the scene aspect ratio is
preserved when dumping.
-show show window while dumping the content. By default, the window is
hidden during capture.
-2d forces usage of 2D renderer. By default, MP4Client uses the ren‐
derer indicated in GPAC configuration file.
-3d forces usage of 3D renderer. By default, MP4Client uses the ren‐
derer indicated in GPAC configuration file.
-quiet removes script message, buffering and downloading status.
FILES
GPAC Configuration File: ~/.gpacrc
AUTHORS
Jean Le Feuvre <jeanlf@users.sourceforge.net> - GPAC (c) 2000-2005 -
ENST 2005-200X
SEE ALSOGPAC(1), MP4Box(1)MP4Client March 2005 MP4Client(1)
