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16.4 Video Playback

Contributed by Ross Lippert.

Video playback is a very new and rapidly developing application area. Be patient. Not everything is going to work as smoothly as it did with sound.

Before you begin, you should know the model of the video card you have and the chip it uses. While XFree86™ supports a wide variety of video cards, fewer give good playback performance. To obtain a list of extensions supported by the X server using your card use the command xdpyinfo(1) while X11 is running.

It is a good idea to have a short MPEG file which can be treated as a test file for evaluating various players and options. Since some DVD players will look for DVD media in /dev/dvd by default, or have this device name hardcoded in them, you might find it useful to make symbolic links to the proper devices:

# ln -sf /dev/acd0c /dev/dvd
# ln -sf /dev/racd0c /dev/rdvd

On FreeBSD 5.X, which uses devfs(5) there is a slightly different set of recommended links:

# ln -sf /dev/acd0c /dev/dvd
# ln -sf /dev/acd0c /dev/rdvd

Additionally, DVD decryption, which requires invoking special DVD-ROM functions, requires write permission on the DVD devices.

Some of the ports discussed rely on the following kernel options to build correctly. Before attempting to build, add these options to the kernel configuration file, build a new kernel, and reboot:

option CPU_ENABLE_SSE
option USER_LDT

To enhance the shared memory X11 interface, it is recommended that the values of some sysctl(8) variables should be increased:

kern.ipc.shmmax=67108864
kern.ipc.shmall=32768

16.4.1 Determining Video Capabilities

There are several possible ways to display video under X11. What will really work is largely hardware dependent. Each method described below will have varying quality across different hardware. Secondly, the rendering of video in X11 is a topic receiving a lot of attention lately, and with each version of XFree86 there may be significant improvement.

A list of common video interfaces:

X11: normal X11 output using shared memory.
XVideo: an extension to the X11 interface which supports video in any X11 drawable.
SDL: the Simple Directmedia Layer.
DGA: the Direct Graphics Access.
SVGAlib: low level console graphics layer.

16.4.1.1 XVideo

XFree86 4.X has an extension called XVideo (aka Xvideo, aka Xv, aka xv) which allows video to be directly displayed in drawable objects through a special acceleration. This extension provides very good quality playback even on low-end machines (for example my PIII 400 Mhz laptop). Unfortunately, the list of cards in which this feature is supported ``out of the box'' is currently:

3DFX Voodoo 3
Intel® i810 and i815
some S3 chips (such as Savage/IX and Savage/MX)

If your card is not one of these, do not be disappointed yet. XFree86 4.X adds new xv capabilities with each release [1]. To check whether the extension is running, use xvinfo:

% xvinfo

XVideo is supported for your card if the result looks like:

X-Video Extension version 2.2
screen #0
  Adaptor #0: "Savage Streams Engine"
    number of ports: 1
    port base: 43
    operations supported: PutImage 
    supported visuals:
      depth 16, visualID 0x22
      depth 16, visualID 0x23
    number of attributes: 5
      "XV_COLORKEY" (range 0 to 16777215)
              client settable attribute
              client gettable attribute (current value is 2110)
      "XV_BRIGHTNESS" (range -128 to 127)
              client settable attribute
              client gettable attribute (current value is 0)
      "XV_CONTRAST" (range 0 to 255)
              client settable attribute
              client gettable attribute (current value is 128)
      "XV_SATURATION" (range 0 to 255)
              client settable attribute
              client gettable attribute (current value is 128)
      "XV_HUE" (range -180 to 180)
              client settable attribute
              client gettable attribute (current value is 0)
    maximum XvImage size: 1024 x 1024
    Number of image formats: 7
      id: 0x32595559 (YUY2)
        guid: 59555932-0000-0010-8000-00aa00389b71
        bits per pixel: 16
        number of planes: 1
        type: YUV (packed)
      id: 0x32315659 (YV12)
        guid: 59563132-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)
      id: 0x30323449 (I420)
        guid: 49343230-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)
      id: 0x36315652 (RV16)
        guid: 52563135-0000-0000-0000-000000000000
        bits per pixel: 16
        number of planes: 1
        type: RGB (packed)
        depth: 0
        red, green, blue masks: 0x1f, 0x3e0, 0x7c00
      id: 0x35315652 (RV15)
        guid: 52563136-0000-0000-0000-000000000000
        bits per pixel: 16
        number of planes: 1
        type: RGB (packed)
        depth: 0
        red, green, blue masks: 0x1f, 0x7e0, 0xf800
      id: 0x31313259 (Y211)
        guid: 59323131-0000-0010-8000-00aa00389b71
        bits per pixel: 6
        number of planes: 3
        type: YUV (packed)
      id: 0x0
        guid: 00000000-0000-0000-0000-000000000000
        bits per pixel: 0
        number of planes: 0
        type: RGB (packed)
        depth: 1
        red, green, blue masks: 0x0, 0x0, 0x0

Also note that the formats listed (YUV2, YUV12, etc) are not present with every implementation of XVideo and their absence may hinder some players.

If the result looks like:

X-Video Extension version 2.2
screen #0
no adaptors present

Then XVideo is probably not supported for your card.

If XVideo is not supported for your card, this only means that it will be more difficult for your display to meet the computational demands of rendering video. Depending on your video card and processor, though, you might still be able to have a satisfying experience. You should probably read about ways of improving performance in the advanced reading Section 16.4.3.

16.4.1.2 Simple Directmedia Layer

The Simple Directmedia Layer, SDL, was intended to be a porting layer between Microsoft® Windows®, BeOS, and UNIX®, allowing cross-platform applications to be developed which made efficient use of sound and graphics. The SDL layer provides a low-level abstraction to the hardware which can sometimes be more efficient than the X11 interface.

The SDL can be found at devel/sdl12

16.4.1.3 Direct Graphics Access

Direct Graphics Access is an XFree86 extension which allows a program to bypass the X server and directly alter the framebuffer. Because it relies on a low level memory mapping to effect this sharing, programs using it must must be run as root.

The DGA extension can be tested and benchmarked by dga(1). When dga is running, it changes the colors of the display whenever a key is pressed. To quit, use q.

16.4.2 Ports and Packages Dealing with Video

This section discusses the software available from the FreeBSD Ports Collection which can be used for video playback. Video playback is a very active area of software development, and the capabilities of various applications are bound to diverge somewhat from the descriptions given here.

Firstly, it is important to know that many of the video applications which run on FreeBSD were developed as Linux applications. Many of these applications are still beta-quality. Some of the problems that you may encounter with video packages on FreeBSD include :

An application cannot playback a file which another application produced.
An application cannot playback a file which the application itself produced.
The same application on two different machines, rebuilt on each machine for that machine, plays back the same file differently.
A seemingly trivial filter like rescaling of the image size results in very bad artifacts from a buggy rescaling routine.
An application frequently dumps core.
Documentation is not installed with the port and can be found either on the web or under the port's work directory.

Many of these applications may also exhibit ``Linux-isms''. That is, there may be issues resulting from the way some standard libraries are implemented in the Linux distributions, or some features of the Linux kernel which have been assumed by the authors of the applications. These issues are not always noticed and worked around by the port maintainers, which can lead to problems like these:

The use of /proc/cpuinfo to detect processor characteristics.
A misuse of threads which causes a program to hang upon completion instead of truly terminating.
Software not yet in the FreeBSD Ports Collection which is commonly used in conjunction with the application.

So far, these application developers have been cooperative with port maintainers to minimize the work-arounds needed for port-ing.

16.4.2.1 MPlayer

MPlayer is a recently developed and rapidly developing video player. The goals of the MPlayer team are speed and flexibility on Linux and other Unices. The project was started when the team founder got fed up with bad playback performance on then available players. Some would say that the graphical interface has been sacrificed for a streamlined design. However, once you get used to the command line options and the key-stroke controls, it works very well.

16.4.2.1.1 Building MPlayer

MPlayer resides in multimedia/mplayer. MPlayer performs a variety of hardware checks during the build process, resulting in a binary which will not be portable from one system to another. Therefore, it is important to build it from ports and not to use a binary package. Additionally, a number of options can be specified in the make command line, as described at the start of the build.

# cd /usr/ports/multimedia/mplayer
# make
You can enable additional compilation optimizations
by defining WITH_OPTIMIZED_CFLAGS
You can enable GTK GUI by defining WITH_GUI.
You can enable DVD support by defining WITH_DVD.
You can enable SVGALIB support by defining WITH_SVGALIB.
You can enable VORBIS sound support by defining WITH_VORBIS.
You can enable XAnim DLL support by defining WITH_XANIM.

If you have x11-toolkits/gtk12 installed, then you might as well enable the GUI. Otherwise, it is not worth the effort. If you intend to play (possibly CSS encoded) DVD's with MPlayer you must enable the DVD support option here [2]. Some reasonable options are:

# make WITH_DVD=yes WITH_SVGALIB=yes

As of this writing, the MPlayer port will build its HTML documentation and one executable, mplayer. It can also be made to build an encoder, mencoder, which is a tool for re-encoding video. A modification to the Makefile can enable it. It may be enabled by default in subsequent versions of the port.

The HTML documentation for MPlayer is very informative. If the reader finds the information on video hardware and interfaces in this chapter lacking, the MPlayer documentation is a very thorough supplement. You should definitely take the time to read the MPlayer documentation if you are looking for information about video support in UNIX.

16.4.2.1.2 Using MPlayer

Any user of MPlayer must set up a .mplayer subdirectory of her home directory. To create this necessary subdirectory, you can type the following:

% cd /usr/ports/multimedia/mplayer
% make install-user

The command options for mplayer are listed in the manual page. For even more detail there is HTML documentation. In this section, we will describe only a few common uses.

To play a file, such as testfile.avi, through one of the various video interfaces set the -vo option:

% mplayer -vo xv testfile.avi

% mplayer -vo sdl testfile.avi

% mplayer -vo x11 testfile.avi

# mplayer -vo dga testfile.avi

# mplayer -vo 'sdl:dga' testfile.avi

It is worth trying all of these options, as their relative performance depends on many factors and will vary significantly with hardware.

To play from a DVD, replace the testfile.avi with -dvd <N> DEVICE where <N> is the title number to play and DEVICE is the device node for the DVD-ROM. For example, to play title 3 from /dev/dvd:

# mplayer -vo dga -dvd 2 /dev/dvd

To stop, pause, advance and so on, consult the keybindings, which are output by running mplayer -h or read the manual page.

Additional important options for playback are: -fs -zoom which engages the fullscreen mode and -framedrop which helps performance.

In order for the mplayer command line to not become too large, the user can create a file .mplayer/config and set default options there:

vo=xv
fs=yes
zoom=yes

Finally, mplayer can be used to rip a DVD title into a .vob file. To dump out the second title from a DVD, type this:

# mplayer -dumpstream -dumpfile out.vob -dvd 2 /dev/dvd

The output file, out.vob, will be MPEG and can be manipulated by the other packages described in this section.

16.4.2.1.3 mencoder

If you opt to install mencoder when you build MPlayer, be forewarned that it is still an experimental component. Before using mencoder it is a good idea to familiarize yourself with the options from the HTML documentation. There is a manual page, but it is not very useful without the HTML documentation. There are innumerable ways to improve quality, lower bitrate, and change formats, and some of these tricks may make the difference between good or bad performance. Here are a couple of examples to get you going. First a simple copy:

% mencoder input.avi -oac copy -ovc copy -o output.avi

Improper combinations of command line options can yield output files that are unplayable even by mplayer. Thus, if you just want to rip to a file, stick to the -dumpfile in mplayer.

To convert input.avi to the MPEG4 codec with MPEG3 audio encoding (audio/lame is required):

% mencoder input.avi -oac mp3lame -lameopts br=192 \
     -ovc lavc -lavcopts vcodec=mpeg4:vhq -o output.avi

This has produced output playable by mplayer and xine.

input.avi can be replaced with -dvd 1 /dev/dvd and run as root to re-encode a DVD title directly. Since you are likely to be dissatisfied with your results the first time around, it is recommended you dump the title to a file and work on the file.

16.4.2.2 The xine Video Player

The xine video player is a project of wide scope aiming not only at being an all in one video solution, but also in producing a reusable base library and a modular executable which can be extended with plugins. It comes both as a package and as a port, multimedia/xine.

The xine player is still very rough around the edges, but it is clearly off to a good start. In practice, xine requires either a fast CPU with a fast video card, or support for the XVideo extension. The GUI is usable, but a bit clumsy.

As of this writing, there is no input module shipped with xine which will play CSS encoded DVD's. There are third party builds which do have modules for this built in them, but none of these are in the FreeBSD Ports Collection.

Compared to MPlayer, xine does more for the user, but at the same time, takes some of the more fine-grained control away from the user. The xine video player performs best on XVideo interfaces.

By default, xine player will start up in a graphical user interface. The menus can then be used to open a specific file:

% xine

Alternatively, it may be invoked to play a file immediately without the GUI interface with the command:

% xine -g -p mymovie.avi

16.4.2.3 The transcode Utilities

The software transcode is not a player, but a suite of tools for re-encoding .avi and .mpg files. With transcode, one has the ability to merge video files, repair broken files, using command line tools with stdin/stdout stream interfaces.

Like MPlayer, transcode is very experimental software which must be build from the port multimedia/transcode. Using a great many options to the make command. I recommend:

# make WITH_LIBMPEG2=yes

If you plan to install multimedia/avifile, then add the WITH_AVIFILE option to your make command line, as shown here:

# make WITH_AVIFILE=yes WITH_LIBMPEG2=yes

Here are two examples of using transcode for video conversion which produce rescaled output. The first encodes the output to an openDIVX AVI file, while the second encodes to the much more portable MPEG format.

% transcode -i input.vob -x vob -V -Z 320x240 \
-y opendivx -N 0x55 -o output.avi

% transcode -i input.vob -x vob -V -Z 320x240 \
-y mpeg -N 0x55 -o output.tmp
% tcmplex -o output.mpg -i output.tmp.m1v -p output.tmp.mpa -m 1

There is a manual page for transcode, but there is little documentation for the various tc* utilities (such as tcmplex) which are also installed. However, the -h command line option can always be given to get curt usage instructions for a command.

In comparison, transcode runs significantly slower than mencoder, but it has a better chance of producing a more widely playable file. MPEGs created by transcode have been known to play on older copies of Windows Media® Player and Apple's Quicktime®, for example.

16.4.3 Further Reading

The various video software packages for FreeBSD are developing rapidly. It is quite possible that in the near future many of the problems discussed here will have been resolved. In the mean time, those who want to get the very most out of FreeBSD's A/V capabilities will have to cobble together knowledge from several FAQs and tutorials and use a few different applications. This section exists to give the reader pointers to such additional information.

The MPlayer documentation is very technically informative. These documents should probably be consulted by anyone wishing to obtain a high level of expertise with UNIX video. The MPlayer mailing list is hostile to anyone who has not bothered to read the documentation, so if you plan on making bug reports to them, RTFM.

The xine HOWTO contains a chapter on performance improvement which is general to all players.

Finally, there are some other promising applications which the reader may try:

Avifile which is also a port multimedia/avifile.
Ogle which is also a port multimedia/ogle.
Xtheater
multimedia/dvdauthor, an open source package for authoring DVD content.

Notes

[1]	A popular familiar graphics card with generally very good XFree86 performance, nVidia, has yet to release the specifications on their XVideo support to the XFree86 team. It may be some time before XFree86 fully support XVideo for these cards.
[2]	Unauthorized DVD playback is a serious criminal act in some countries. Check local laws before enabling this option.

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