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-
-
-ABOUT LIBMPEG2
-
-libmpeg2 is a free library for decoding mpeg-2 and mpeg-1 video
-streams. It is released under the terms of the GPL license.
-
-The main goals in libmpeg2 development are:
-
- * Conformance - libmpeg2 is able to decode all mpeg streams that
- conform to certain restrictions: "constrained parameters" for
- mpeg-1, and "main profile" for mpeg-2. In practice, this is
- what most people are using. For streams that follow these
- restrictions, we believe libmpeg2 is 100% conformant to the
- mpeg standards - and we have a pretty extensive test suite to
- check this.
-
- * Speed - there has been huge efforts there, and we believe
- libmpeg2 is the fastest library around for what it
- does. Please tell us if you find a faster one ! With typical
- video streams as found on DVD's, and doing only decoding with
- no display, you should be able to get about 110 fps on a
- PIII/666, or 150 fps on an Athlon/950. This is less than 20
- cycles per output pixel. In a real player program, the display
- routines will probably take as much time as the actual
- decoding !
-
- * Portability - most of the code is written in C, and when we
- use platform-specific optimizations (typically assembly
- routines, currently used for the motion compensation and the
- inverse cosine transform stages) we always have a generic C
- routine to fall back on. This should be portable to all
- architectures - at least we have heard reports from people
- running this code on x86, ppc, sparc, arm and
- sh4. Assembly-optimized implementations are available on x86
- (MMX) and ppc (altivec) architectures. Ultrasparc (VIS) is
- probably the next on the list - we'll see.
-
- * Reuseability - we do not want libmpeg2 to include any
- project-specific code, but it should still include enough
- features to be used by very diverse projects. We are only
- starting to get there - the best way to help here is to give
- us some feedback !
-
-The project homepage is at http://libmpeg2.sourceforge.net/
-
-
-MPEG2DEC
-
-mpeg2dec is a test program for libmpeg2. It decodes mpeg-1 and mpeg-2
-video streams, and also includes a demultiplexer for mpeg-1 and mpeg-2
-program streams. It is purposely kept simple : it does not include
-features like reading files from a DVD, CSS, fullscreen output,
-navigation, etc... The main purpose of mpeg2dec is to have a simple
-test bed for libmpeg2.
-
-The libmpeg2 source code is always distributed in the mpeg2dec
-package, to make it easier for people to test it.
-
-The basic usage is to just type "mpeg2dec file" where file is a
-demultiplexed mpeg video file.
-
-The "-s" option must be used for multiplexed (audio and video) mpeg
-files using the "program stream" format. These files are usualy found
-on the internet or on unencrypted DVDs.
-
-The "-t" option must be used for multiplexed (audio and video) mpeg
-files using the "transport stream" format. These files are usualy
-found in digital TV applications.
-
-The "-o" option is used to select a given output module - for example
-to redirect the output to a file. This is also used for performance
-testing and conformance testing.
-
-The "-c" option is used to disable all optimizations.
-
-
-OTHER PROJECTS USING LIBMPEG2
-
-libmpeg2 is being used by various other projects, including:
-
- * xine (http://xine.sourceforge.net/) - started as a simple
- mpeg-2 audio and video decoder, but it since became a
- full-featured DVD and video media player.
-
- * VideoLAN (http://www.videolan.org/) - video streaming over an
- ethernet network, can also be used as a standalone player.
-
- * MPlayer (http://www.MPlayerHQ.hu) - another good player, it is
- also very robust against damaged streams.
-
- * movietime (http://movietime.sourceforge.net/) - still quite
- young, but it looks very promising !
-
- * mpeg2decX (http://homepage1.nifty.com/~toku/software_en.html) -
- a graphical interface for mpeg2dec for macintosh osX.
-
- * TCVP (http://tcvp.sf.net) - video and music player for unix.
-
- * drip (http://drip.sourceforge.net/) - a DVD to DIVX transcoder.
-
- * PoMP
- (http://www.dmclab.hanyang.ac.kr/research/project/PoDS/PoDS_sw.htm) -
- a research player optimized to minimize disk power consumption.
-
- * OMS (http://www.linuxvideo.org/oms/)
-
- * XMPS (http://xmps.sourceforge.net/)
-
- * GStreamer (http://www.gstreamer.net/) - a framework for
- streaming media; it has an mpeg2 decoding plugin based on
- libmpeg2.
-
- * mpeglib (http://mpeglib.sourceforge.net/) - a video decoding
- library that usess libmpeg2 when decoding mpeg streams.
-
- * daphne (http://daphne.rulecity.com/) - a laserdisc arcade game
- simulator.
-
- * GOPchop (http://outflux.net/unix/software/GOPchop/) - a
- GOP-accurate editor for MPEG2 streams.
-
-If you use libmpeg2 in another project, let us know !
-
-
-TASKS
-
-There are several places where we could easily use some help:
-
- * Documentation: libmpeg2 still has no documentation. Every
- project using it has had to figure things out by looking at
- the header files, at the mpeg2dec sample application, and by
- asking questions. Writing down a nice documentation would make
- the code more easily reuseable.
-
- * Testing: If you find any stream that does not decode right
- with libmpeg2, let us know ! The best thing would be to mail
- to the libmpeg2-devel mailing list. Also, it would be nice to
- build a stress test so we can make sure libmpeg2 never crashes
- on bad streams.
-
- * Coding: There is a small TODO list in the mpeg2dec package,
- you can have a look there ! Most items are pretty terse
- though.
-
- * Porting: If you're porting to a new architecture, you might
- want to experiment with the compile flags defined in
- configure.in . When you figure out whats fastest on your
- platform, send us a patch !
-
- * Assembly optimizations: We only have x86 and altivec
- optimizations yet, it would be worthwhile writing routines for
- other architectures, especially those that have SIMD
- instruction set extensions ! Also the yuv2rgb x86 routines
- could probably be optimized a lot.
-
-
-CVS SNAPSHOTS
-
-A daily snapshot is created using "make distcheck" every night and
-uploaded to http://libmpeg2.sourceforge.net/files/mpeg2dec-snapshot.tar.gz .
-It is easier to use than the CVS repository, because you do not need
-to have the right versions of automake, autoconf and libtool
-installed. It might be convenient when working on a libmpeg2 port for
-example.
-
-
-CVS REPOSITORY
-
-The latest libmpeg2 and mpeg2dec source code can always be found by
-anonymous CVS:
-
-# export CVSROOT=:pserver:anonymous@cvs.libmpeg2.sourceforge.net:/cvsroot/libmpeg2
-# cvs login (Just press Return when prompted for a password)
-# cvs checkout mpeg2dec
-
-You can also browse the latest changes online at
-http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/libmpeg2/mpeg2dec/
-
-The other CVS modules are mpeg2dec-streams for the test suite, and
-mpeg2dec-livid for the CVS history of the project while it was still
-hosted on the linuxvideo.org servers.
-
-
-MAILING LISTS
-
-See the subscription information at http://libmpeg2.sourceforge.net/lists.html
-
-libmpeg2-devel
-
-This is the main mailing list for technical discussion about
-libmpeg2. Anyone wanting to work on libmpeg2, or maybe just stay
-informed about the development process, should probably subscribe to
-this list.
-
-libmpeg2-checkins
-
-All libmpeg2 checkins are announced there. This is a good way to keep
-track of what goes into CVS.
-
-libmpeg2-announce
-
-This is a very low traffic mailing list, only for announcements of new
-versions of libmpeg2. Only project administrators can post there.