mirror of https://github.com/mpv-player/mpv
140 lines
5.2 KiB
Plaintext
140 lines
5.2 KiB
Plaintext
DVD support in MPlayer!
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~~~~~~~~~~~~~~~~~~~~~~~
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Read file 'DVD-FAQ' as well (and try to avoid recursion by the redirector
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message there :).
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IMPORTANT NOTE: please _DO_NOT_ require further features for DVD playback. This
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is extremly experimental hack. Maybe it won't work for you. If you're
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capable of helping us do it now! First we would like to fix existing problems.
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Then we can start implementing advanced DVD playback functions of course.
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This means current DVD functions are mainly for developers and not for users!
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Building MPlayer with libcss support
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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First, you must compile and install libcss on your system.
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Second, you have to recompile MPlayer with libcss support. There is
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autodetection of libcss, but if it fails, see below :
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Call ./configure script of MPlayer with these options:
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./configure --enable-css --with-csslibdir=/usr/local/lib --with-cssincdir=/usr/local/include
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(of course you can append your favourite options as well)
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--with-csslibdir=/usr/local/lib
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Directory contains libcss.so shared library. This directory should
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be in your /etc/ld.so.conf as well.
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--with-cssincdir=/usr/local/include
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Directory contains header file 'css.h' of libcss.
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Viewing VOB files directly from DVD
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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mplayer -dvdauth /dev/dvd /mnt/cdrom/video_ts/vts_01_1.vob
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where,
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'-dvdauth /dev/dvd' tells MPlayer the device name of your DVD drive.
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it's used in disc authentication process
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the filename is simply a VOB file path on the disc
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Note that according to my experiences, disc authentication requires root
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privileges so you must run MPlayer as root! (see section 'Problems').
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NOTE about the sound:
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It seems that MPlayer sometimes fails to find the first audio stream.
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You can specify it with the '-aid 128' option, for example.
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Please experience with 128,129 and similar values. See section
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'Problems'.
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New source files
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~~~~~~~~~~~~~~~~
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dvdauth.c
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Issues DVD disc and title authentication and fills key_disc and
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key_title arraies.
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dvdauth.h
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header file
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These files are embedded inside an '#ifdef ... #endif' block, so if libcss
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support was not requested, they do not produce any code and of course
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libcss is not linked against MPlayer either.
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Modifications in the source
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* (stream.c) STREAM_BUFFER_SIZE is set to 2048
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* (demux_mpg.c) the old message of 'encrypted VOB file is not supported'
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was changed to set a flag to 1. After parsing the header, if this
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flag is set, we call descramble function of libcss for decrypt.
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* (stream.c) on several points where the old 4096 length STREAM_BUFFER_SIZE was
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hardcoded into the source, it was replaced with 'STREAM_BUFFER_SIZE'
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* (mplayer.c) calling dvd disc and title authentication and seek to sector
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boundaries on seeking for mpegs
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Performance
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~~~~~~~~~~~
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On my AMD K6-2 with using hw scaling and colorspace conversion
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capability of my G400 it's possible to watch DVD with about 70%
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CPU usage with '-nosound'. Unfortunately with sound my machine is
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not enough :( Maybe it can be improved somewhat ...
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Guess, it's not so bad ... According to reports from my friends
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xine uses 80-90% CPU to play DVD on much more powerful machines
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like 1GHz Athlon systems (as far as I know, it's said that about
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300MHz celeron is the minimum to watch DVDs ... using windows
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DVD viewers).
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Hint: I commented out downmix functions from libac3 (of course in this way I
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can't get sound) and audio decoding CPU usage became 11% instead of 24 on
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my machine. This clearly indicates that we should optimize downmix functions
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(KNI code is no use for my k6-2).
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HOT NEWZ:
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We have got 3Dnow optimized libac3. Wow ;-)
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Problems (TODO)
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~~~~~~~~~~~~~~~
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* disc authentication (the FIBMAP ioctl) requires root privilegies.
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this is strange since OMS can do it as user too.
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* sound. I'm using my only DVD disc (The Matrix) to test MPlayer.
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some VOB file have English sound, some have Spanish and some have
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no sound at all.
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IT SEEMS that if I give '-aid 128' everything works with English sound ...
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* strange effects but only with SOME vob files (it looks like some interlacing
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effect, eg: every 2nd line on the screen is from the last frame).
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feature TODO
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~~~~~~~~~~~~
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* chapter scanner
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* audio stream scanner and allow to select one on runtime as well
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(in stage#1 it would be enough to select one on the startup, see
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'Problems' above)
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* DVD menu
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I found (at least on disc 'The Matrix') the menu VOB but I don't
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know how can it be used.
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(after some eyeballing on the source of OMS, it seems we would have to
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parse *.ifo files)
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* subtitle support
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* OSD/GUI (?) support for select chapter, subtitle and audio stream
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* getting some documentation on DVD format, eg: which is the 'root' VOB
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file on the disc in video_ts directory, which is the menu and so on.
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* improve performance (see 'Performance' above)
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No sound problem (from Matrix DVD, the menu VOB)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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End of packet while searching for PCM header
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DEMUXER: Too many (2048 in 4131540 bytes) video packets in the buffer!
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(maybe you play a non-interleaved stream/file or video codec failed)
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MPEG: No Audio stream found... ->nosound
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However this does not occur if you specify '-aid 128'.
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