Feb, 2003
Bill May
Cisco Systems
This is the beginning of a README for mp4player that will answer
some questions on how to use mp4player.
There is also a main README for the mpeg4ip project,
as well as an internals guide to the player.
Command line arguments
Configuration Variables
Player Plugins
Player URLS
MP4Player key shortcuts
Windows GUI
Known Problems
mp4player will take a -l option (to loop). Both mp4player and gmp4player will take a file name/url to start playing. As of 1.1, mp4player and gmp4player will take configuration variables in the command line. Use --<variable>=<value>, and make sure that the correct case is used.
You can display the configuration variable list by using either -c or --config-vars
That's it.
Configuration variables are stored in the windows registry for Windows (see below), and in ~/.gmp4player_rc for every other OS.
Configuration variables are read at start, and apply to the entire session. Some can be changed with GUI knobs. The latest list of configuration variables can be found in our_config_file.cpp. LOG_* defines can be found in include/systems.h
Boolean values must be 0 or 1.
Here is the current list by categories:
History List | ||||
---|---|---|---|---|
Name | Type | Default | Gui | Does |
File0 | String | NULL | yes | last file player |
File1 | String | NULL | yes | before that one |
File2 | String | NULL | yes | before that one |
File3 | String | NULL | yes | before that one |
PrevDirectory | String | NULL | yes | last directory looked at |
Playing Status | ||||
Name | Type | Default | Gui | Does |
Looped | Boolean | 0 | yes | loop session |
Audio Knobs | ||||
Name | Type | Default | Gui | Does |
PlayAudio | Boolean | 1 | yes | Enables/Disables audio stream |
Volume | Integer | 75 | yes | volume percentage |
AudioMuted | Boolan | 0 | yes | mutes audio |
LimitAudioSdlBuffer | Boolean | 0 | no | See below |
Video Knobs | ||||
Name | Type | Default | Gui | Does |
PlayVideo | Boolean | 1 | yes | Enables/Disables video stream |
AspectRatio | Integer | 0 | yes | Sets Aspect Ratio |
FullScreen | Boolean | 0 | yes | Enable full screen on start. |
Compatibility Knobs | ||||
Name | Type | Default | Gui | Does |
UseOldMp4Lib | Boolean | 0 | yes | Uses Quicktime library for mp4 files |
Streaming Knobs | ||||
Name | Type | Default | Gui | Does |
RtpBufferTimeMsec | Integer | 2000 | no | Sets time of initial RTP buffering. |
MulticastIf | String | no | Sets the interface to use for multicast receive | |
RxSocketSize | Integer | 0 | no | Set the receive buffer size (0 use default) |
RtpIpPortMin | Integer | -1 | no | Sets local ip port to start with in RTSP session |
RtpIpPortMax | Integer | -1 | no | Sets local ip port to end with in RTSP session |
UseRtpOverRtsp | Boolean | 0 | yes | Use RTP over RTSP (rfc 2326, section 10.2) |
SendRtcpInRtpOverRtsp | Boolean | 0 | no | Enables sending of RTCP msgs to server when using RTP over RTSP (If enabled, can crash DSS). |
Mpeg2tPamWaitSecs | Integer | 30 | no | Sets time to wait for PAM in Mpeg2 transport session |
Debugging Knobs | ||||
Name | Type | Default | Gui | Does |
HttpDebug | Integer | LOG_ALERT | yes | Sets Http library debug level |
RtspDebug | Integer | LOG_ALERT | yes | Sets RTSP library debug level |
SdpDebug | Integer | LOG_ALERT | yes | Sets SDP library debug level |
RtpDebug | Integer | LOG_ALERT | yes | Sets RTP library debug level |
Mpeg2tDebug | Integer | LOG_ALERT | yes | Sets Mpeg2t library debug level |
Plugin Knobs | ||||
Name | Type | Default | Gui | Does |
Mpeg4IsoOnly | Boolean | 0 | yes | Forces ISO decoder over Xvid |
UseMpeg3 | Boolean | 0 | no | Forces use of libmpeg3 decoder |
Starting with version 0.9.3.2, we've gone to a plugin model for audio and video codecs for the player. This is true for both windows and linux platforms. As of 0.9.7, we also have plugins available for RTP byte streams.
On linux (and linux like) platforms, the plugins should be in the mp4player_plugin directory, which is a sub directory of where the other mpeg4ip libraries will be stored. You must do a make install of the plugin when running/debugging with plugins - the player does not currently search for plugins. When installing a new version of the plugins, it is a good idea to purge this directory.
On Windows, the .dlls that get created must be in the same directory as the executable for mp4player.exe or wmp4client.exe. The project files should copy the plugin DLLs to the player/src directory, so when running the player, it should work fine.
The plugin pattern can be found in player/src/codec_plugin.h and in player/src/rtp_plugin.h. Both plugins contain a version number to enable detection of API changes.
We have 2 special type URLs for the player to play content. The first one is for mpeg2 transport streams. To play an mpeg2 transport stream over UDP, use the following url:
mpeg2t://<multicast address>:<multicast port>
The 2nd special URL is to play a stream from a Cisco IP/TV server, either broadcast or on demand. To do this, use the following url:
iptv://<iptv content manager>/<program id>
Where iptv content manager is the address of the IP/TV content manager, and program id is the session id that is created. You can find this out by looking at the program on the content manager, or get the session id by running the iptv_prog utility with the content manager as a parameter.
If you are using mp4player (or gmp4player), the following key short cuts can be used, assuming you've got a video window:
HOME | begin video from beginning |
PAGE UP | increase video size (200% max) |
PAGE DOWN | decrease video size (50% min) |
ALT-ENTER | fullscreen |
ESC | return from fullscreen |
LEFT ARROW | go back 10 seconds |
RIGHT ARROW | go forward 10 seconds |
UP ARROW | volume up 1/10th |
DOWN ARROW | volume down 1/10th |
SPACE | pause or continue |
CTRL-C | close video (mp4player - advance to next playlist) |
CTRL-X | close mp4player |
CTRL-0 | Default Aspect Ratio |
CTRL-1 | Aspect Ratio of 3:4 |
CTRL-2 | Aspect Ratio of 16:9 |
CTRL-3 | Aspect Ratio of 1.85 Letterbox |
CTRL-4 | Aspect Ratio of 2.35 Letterbox |
CTRL-S | Seek dialog (gmp4player only) |
CTRL-N | Next item in playlist (gmp4player only) |
First - if you're the type of person who wants the player to work with a nice interface, this isn't the place for you. Go see Quicktime or Envivio players.
We've created a simple windows GUI. It consists of 2 parts - wmp4player and wmp4client. wmp4player contains the GUI, and wmp4client is basically mp4player that will communicate with wmp4player.
wmp4client is launched as a seperate process, due to SDL limitations. The 2 processes communicate using file maps in memory. See the CMp4Process and CMP4If classes in wmp4player and CClientProcess in wmp4client.
To create this, look for the player60.dsw in player/src directory. This will make all 3 executables (mp4player, wmp4player.exe and wmp4client.exe, as well as all the plugins).
To install wmp4player, put the Release version (ie: versions from the Release folder) of wmp4player.exe, wmp4client.exe and SDL.dll in the same directory. We will not be writing any installers. In addition, make sure all desired plugins are in the same directory.
These programs will use the registry for storing information that Linux stores in .gmp4player_rc. Look for the Software\Mpeg4ip\Config registry entry. Our config file library is rigged to save this data there. mp4player will still use a gmp4player_rc file.
At this time, if it's broken, you're going to have to fix it. The same goes with GUI "nits" - we're not GUI writers. Currently, there is no playlist support, no loop support, no drag and drop support, no wmp4player command line support, no accelerator from the dialog window (accelerators from the video window still work).
RtpIpPortMin=<port>
and
RtpIpPortMax=<port>
in the .gmp4player_rc file created in your home
directory. The IETF recommends a range of 6970 to 6999.
#define OLD_SURFACE
in player/src/video.cpp.
If you have problems with choppy playback, and you're using Windows 98, forget about it. The timer tick time is too slow (55 msec) for us to use effectively. Try Quicktime or Real with Envivio, or update to a newer Windows OS.
This is due to an error in the thread scheduling code that causes a problem with a delay of less than the thread scheduler quantum (200 msec in some versions, 20 in others). Since the average delay used is 9 to 10 msec (less as we get closer to the video rendering time), this can have a great effect on video playback.
You can get around this error by rebuilding your libc, after changing the
THREAD_SCHED_USECS
to 20000 (or lower) from 200000 in thread_private.h.
LimitAudioSdlBuffer
config
variable to 1 in the .gmp4player_rc file. This seems to occur on a
Soundblaster Live, Red Hat 7.3 machine.
=== END OF README ===