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  v1.25, 2000-10-17

  A (hopefully) easy to follow explanation on how to get DVD movie play�
  back in Linux.

  Table of Contents

  1. Introduction

     1.1 Goal
     1.2 New Versions
     1.3 Copyrights and Trademarks
     1.4 Thanks
     1.5 Translations

  2. Requirements

  3. Files

  4. Installation

     4.1 Kernel
     4.2 LiViD Utilities

  5. Playing

  6. Additional Stuff

     6.1 Setting up MTRR's

  7. Problems

     7.1 Run time errors
        7.1.1 Illegal Instruction Error
     7.2 Compilation errors
        7.2.1 `dvd_struct' undeclared...
        7.2.2 Can't determine absolute dir of '../../../../src/plugin/codec/mpeg2dec/.libs'
        7.2.3 Can't find or
        7.2.4 Failure via segfault for no apparent reason
     7.3 Broken stuff
     7.4 Other errors

  8. To Do


  1.  Introduction

  1.1.  Goal

  The purpose of this is to provide step by step instructions on getting
  DVD movies to play in Linux. I will try to be as clear as possible,
  but if something is confusing or incorrect, please tell me about it
  and I'll fix it. If you have any questions, you can subscribe to the
  livid-user mailing list by sending a blank email to livid-user- <>.

  1.2.  New Versions

  This howto is available in many formats, including html and tex. The
  newest version can always be retrieved from
  <>. It is highly
  recommended that you get the most recent version, as this howto is
  being updated quite often.

  1.3.  Copyrights and Trademarks

  This manual may be reproduced in whole or in part, without fee,
  subject to the following restrictions:

  �  The copyright notice above and this permission notice must be
     preserved complete on all complete or partial copies.

  �  Any translation or derived work must be approved by the author in
     writing before distribution.

  �  If you distribute this work in part, instructions for obtaining the
     complete version of this manual must be included, and a means for
     obtaining a complete version provided.

  �  Small portions may be reproduced as illustrations for reviews or
     quotes in other works without this permission notice if proper
     citation is given.

  Exceptions to these rules may be granted for acedemic purposes: Write
  to the author and ask. These restrictions are here to protect us as
  authors, not to restrict you as learners and educators. Any souce code
  (aside from the SGML this document was written in) in this document is
  placed under the GNU General Public License, available via anonymous
  FTP from the GNU archive <>.

  1.4.  Thanks

  Thanks to Nathan Rowlan <> for
  starting and maintaining this document in the early days.  It has now
  been taken over by the LiViD support team.

  Thanks to the authors of OMS and the rest of the LiViD developers, who
  have given the project much of their time and work, and also to those
  individuals who have given feedback to make this HOWTO better.

  Much of the layout of this HOWTO was gotten from the HOWTO-HOWTO,
  written by Mark F. Komarinski.  It can be found at <>.

  1.5.  Translations

  Translations of this document can be found at
  <>.  If you would like
  to translate this howto, please contact the LiViD development mailing

  2.  Requirements

  This HOWTO assumes you have:

  �  Linux kernel v2.2.x or greater.  A kernel with DVD ioctls is

  �  XFree86 3.3.X or 4.x

  �  A DVD-ROM/RAM/RW drive supported in Linux (most are)

  �  A decent knowledge of bash and english

  3.  Files

  First things first, you need to get a kernel with MTRR (more on this
  later) and DVD ioctl support. While MTRR's have been in the kernel
  since 2.2.11 (correct me if I'm wrong), you will probably need to
  update your kernel to get DVD ioctls.  There are two ways to skin this
  cat, you can either download a development kernel (v2.3.x), or patch a
  stable release kernel (v2.2.x), the patches are at <>, and the kernel can be
  found on your favorite mirror of

  Next, you need to get the LiViD utilities. This can be done two ways:

  �  Get the LiViD utilities from CVS, so you can update it as it is
     being updated by the developers. (recommended)

         The following commands will retrieve them (you can use -d parameter
         instead of setting CVSROOT if you want):

         # mkdir ~/livid
         # cd ~/livid
         # export
         # cvs login
         (Logging in to
         CVS password:

         There is no password for anonymous, just press enter.

         # cvs -z3 co -P ac3dec mpeg2dec oms

         They should download into their respective directories.

  �   If you don't like CVS or can't access it due to firewall issues,
     you can download the most recent nightly tarball of LiViD tools at

  4.  Installation

  4.1.  Kernel

  Kernels at least as recent as 2.2.16 or 2.4 series should already have
  DVD ioctl support, so you just need to make sure you have MTRR support
  enabled in the kernel configuration, and then compile and install it
  as you normally would.

  If you want to patch your exisiting older kernel, start by going to <> and downloading the
  correct patch for your kernel.
  If don't know how to install or patch your kernel, you should go read
  the Kernel HOWTO at
  HOWTO.html <>

  4.2.  LiViD Utilities

  To install the LiViD utilities, you need to make sure you have
  /usr/local/lib somewhere in /etc/

  DVD playback only requires OMS to be built.  It builds ac3 and mpeg2
  codecs by itself.  However, feel free to play with the standalone
  codecs if you wish.  The following commands should compile and install
  the LiViD utilities on your system.  If you have problems, please see
  the "Problems" section.

        ac3dec: (optional)

          # cd ~/livid/ac3dec
          # ./
          # make
          # make install

        mpeg2dec: (optional)

          # cd ~/livid/mpeg2dec
          # ./
          # make
          # make install


          # cd ~/livid/oms
          # ./
          # ./configure
          # make
          # make install

  There are some extra options that can be used. They are placed as
  arguments to the ./configure script. OMS has --enable-devel which will
  enable some development and experimental features in the code.
  Standard autoconf parameters such as --prefix can be used if you wish
  to install somehwere other than /usr/local.  For instance to install
  in a subdir of the source dir you could do:

          # ./configure --prefix=`pwd`/inst

  Run ./configure --help to get a complete listing of options.  If you
  install X in an odd location (for instance you have XFree86 3.3.x and
  4.x installed at the same time) you may need the --x-includes and --x-
  libraries options.

  Now the necessary LiViD utilities should be installed.  The next
  section is not required, but if you use the "pipes" plugin, you will
  need to make some special fifo pipes for the DVD data to travel over.
  These can be made with the following commands (if they don't already

          # mkfifo /tmp/video
          # mkfifo /tmp/audio

  Another method of controlling the data available in the oms_devel
  version is to use raw I/O, which is available in the latest linux
  kernels. If you don't have these, data will be read from the standard
  device. Using raw I/O is recommended, but not necessary.  If they do
  not exist, create two devices as follows:

          # mknod /dev/rawctl c 162 0
          # mknod /dev/raw1 c 162 1

  One last thing to do. OMS needs /dev/dvd to be a symlink to where your
  DVD drive resides, such as /dev/hdb1 or /dev/scd0.  If it is at
  /dev/cdrom, you would create the link by typing:

          # ln -s /dev/cdrom /dev/dvd

  It is generally a good idea not to make a symlink to a symlink,
  because it adds unnecessary I/O.  Replace /dev/cdrom with the correct
  device that your dvd drive is on.

  5.  Playing

  First you need a config file.  Copy doc/config.sample from oms source
  directory to .oms/config in your home directory.  Edit the values to
  reflect the drivers, skin, device, etc you want to use.

  Expect lots of text to scroll by. This is still development code. If
  you see lots of text, but no video window you may have a mistake in
  your config file.  Check to make sure you are using the right plugins
  and devices.

  To play a DVD, you need to be running X in 16-bit color mode. With the
  DVD in the drive, type:

          # oms

  There is a pipe method available in older OMS versions that uses the
  fifo's created earlier.  Most people can ignore this.  To use pipes

          # ac3dec /tmp/audio& mpeg2dec /tmp/video& oms

  ac3dec and mpeg2dec may need to be killed by hand using this method.

  If all has gone well, some text should fly by, followed by it asking
  you if you want it to look up the name of the disk in the DVDDB.  It
  is safe to say yes. Then, the oms panel should pop up. Click the
  playlist button, then the scan dvd button, then play.
  6.  Additional Stuff

  6.1.  Setting up MTRR's

                  ** Note to Matrox video card owners **

                  If you have matroxfb compiled into the kernel,
                  chances are that your MTRR's are already set
                  up.  You can probably just skip this section.

  Setting up your MTRR's can increase video performance quite a bit in
  some cases, so it is a good idea to do it.  First, you need to make
  sure you have MTRR support in your kernel by typing:

             # ls /proc/mtrr

  If it tells you that there is no such thing as /proc/mtrr, you need to
  recompile your kernel with MTRR support (it is under "Processor type
  and features" in menuconfig).

  Once you know MTRR is working, you need to know the base memory
  address of your video card, and how much video ram it has.  The
  easiest way to do this is to look at the output of X as it starts up.
  Because the output usually scrolls off the screen and is lost when it
  switches to a different tty, you need to redirect the output of X to a
  file (xoutput) so you can go back and look at it to get the needed
  values.  This can be done by typing:

             # startx 2> xoutput

  The line having the needed information is probably somewhere towards
  the middle of xoutput, and should look something like:

             (--) SVGA: PCI: NVidia Riva TNT2 rev 17, Memory @ 0xee000000, 0xe2000000

  Once you have located that, write down the last memory address, in
  this case 0xe2000000.  Depending on your hardware, you may or may not
  have multiple memory addresses shown, so don't worry if yours looks a
  little different. With this information recorded, you can delete

  Next you need to create a new MTRR. In order to do that, you have know
  how much ram your video card has in hex. Here are some common values:

             4MB  -- 0x400000
             8MB  -- 0x800000
             16MB -- 0x1000000
             32MB -- 0x2000000

  To add the MTRR, type:

             # echo "base=0xe2000000 size=0x2000000 type=write-combining" >| /proc/mtrr

  Substituting "0xe2000000" and "0x2000000" with the base address and
  amount of video ram specific to your system.

  Now you should have MTRR set up, and just to make sure, type:

             # cat /proc/mtrr

  And you should get output that looks remotely similar to:

             reg00: base=0x00000000 (   0MB), size= 128MB: write-back, count=1
             reg01: base=0xe2000000 (3616MB), size=  32MB: write-combining, count=1

  Again, the number of entries will probably be different from these,
  don't sweat it.

  7.  Problems

  7.1.  Run time errors

  This is a (small) list of known run-time errors.

  7.1.1.  Illegal Instruction Error

  If you use a non-Intel chip (K6 especially), and you are getting this
  error when you try to run mpeg2video, try editing nist/,
  lines 129 and 130:

                 CFLAGS="$CFLAGS -DHAVE_MMX -DLINUX -march=i686 -fschedule-insns2 -malign-doub
                 CXXFLAGS="$CXXFLAGS -DHAVE_MMX -DLINUX -march=i686 -fschedule-insns2 -malign-

  replace "-march=i686" in both with "-march=i586", and then recompile
  and reinstall.

  7.2.  Compilation errors

  This is a running list of common compilation errors that have known

  7.2.1.  `dvd_struct' undeclared...

  The most frequent problem people have when trying to compile these
  utilities stems from oms looking in the wrong place for the kernel
  headers. By default, it uses /usr/include/[linux|asm], but those
  headers are from a stable kernel so that when you compile a normal
  program, it will be using older headers. OMS needs to use headers with
  dvd ioctl support. If things are set up wrong many things are
  undeclared and compilation fails. The best way to fix this is to use
  the configure option --with-kernel-headers=(path to headers).  Another
  way is to adjust which headers are in the default location.

          These commands should do it:

          # mkdir /usr/include/old
          # mv /usr/include/linux /usr/include/old/linux
          # mv /usr/include/asm /usr/include/old/asm
          # mv /usr/include/scsi /usr/include/old/scsi
          # ln -s /usr/src/linux/include/linux /usr/include/linux
          # ln -s /usr/src/linux/include/scsi /usr/include/scsi
          # ln -s /usr/src/linux/include/asm /usr/include/asm

  7.2.2.  Can't determine absolute dir of '../../../../src/plu�

  Another common error is with the oms/src/plugin/codec/mpeg2dec/.libs
  directory. For some reason or another, this directory does not exist,
  and it needs to for compilation. To fix it, just make the directory:

          # mkdir src/plugin/codec/mpeg2dec/.libs

  7.2.3.  Can't find or

  Xfree86 4.x doesn't build shared libs for Xv and Xxf86dga.  However,
  the shared lib setup OMS uses needs them.  Build them as follows in
  your favorite lib dir:

          # ld --whole-archive -shared -o libXv.a
          # ld --whole-archive -shared -o libXxf86dga.a

  7.2.4.  Failure via segfault for no apparent reason

  Sometime you have old libraries laying around that are used by
  mistake.  This will cause unwanted behavior such as crashing.  Get rid
  of old libraries from /usr/local/lib or wherever you put them and
  things should work.

  7.3.  Broken stuff

  Features that don't currently work as intended:

  �  The chapter seek buttons may fail.

  �  The play/pause/stop buttons may fail to work.

  �  Audio/video may skip or sound "choppy".  This is due to proper
     syncronization and framedropping not being implemented yet.

  7.4.  Other errors

  If your problem isn't listed here, then likely the current CVS code
  has a bug in it or is missing a feature.  You can either hope it will
  be fixed and update CVS every so often or subscribe to the mailing
  lists and report the bug or request a feature.  To subscribe send a
  blank email to <mailto:livid-user->.

  8.  To Do

  �  Makefile options (HAVE_MMX, HAVE_3DNOW, etc)

  �  proper architecture detection (compile time and runtime)

  �  add easy MTRR stuff (framebuffer)

  �  add need for region coding to be set on most drives:

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