mirror of https://github.com/mpv-player/mpv
208 lines
7.3 KiB
HTML
208 lines
7.3 KiB
HTML
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<HTML>
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<BODY>
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<PRE>
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<A NAME=4.1>4.1. CD-ROM drives
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From Linux documentation:
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Some CDROM drives are capable of changing their head-speed. There are several
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reasons for changing the speed of a CDROM drive. Badly pressed CDROMs may
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benefit from less-than-maximum head rate. Modern CDROM drives can obtain very
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high head rates (up to 24-times is common). It has been reported that these
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drives can make reading errors at these high speeds, reducing the speed can
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prevent data loss in these circumstances. Finally, some of these drives can
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make an annoyingly loud noise, which a lower speed may reduce.
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The recommended way to do it is with a program called 'setcd' . It's kinda
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old, but won't be too hard to find on the Net. (UPDATE : new hdparm
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has an option for this !)
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Use it with :
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setcd -x [speed] [cdrom device]
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Also you can try :
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echo current_speed:4 >/proc/ide/[cdrom device]/settings
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but you'll need root privileges. I use following command too :
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echo file_readahead:2000000 >/proc/ide/[cdrom device]/settings
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for 2MB prefetched reading from the file (it's useful for scratched CDROMs).
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It's recommended that you tuneup your CDROM drive also with hdparm :
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hdparm -d1 -a8 -u1 (cdrom device)
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to enable using DMA access, readahead, and IRQ unmasking.
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(if you don't understand these, *read the hdparm manpage*)
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Please refer to "/proc/ide/[cdrom device]/settings" for fine-tuning your
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CDROM.
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<A NAME=4.2>4.2. DVD drives
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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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First, you must compile and install libcss on your system.
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Second, you have to recompile <B>MPlayer</B> 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 <B>MPlayer</B> 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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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 <B>MPlayer</B> 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 <B>MPlayer</B> as root! (see section 'Problems').
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NOTE about the sound:
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It seems that <B>MPlayer</B> 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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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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* 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 <B>MPlayer</B>.
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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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* 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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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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<A NAME=4.3>4.3. DVD FAQ
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<B>Q: I have some problem not mentioned here ...
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</B>A: Read file 'DVD' as well.
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<B>Q: How can I actually watch DVD with MPlayer?
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</B>A: Ehh. Go on reading this file as well as 'DVD' (hint: you must have libcss)
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<B>Q: So MPlayer can play DVDs? Then it must use DeCSS! You are under arrest
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under the XYZ#$ paragraph of the--
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</B>A: Get back asshole, there is no DeCSS code in MPlayer. It links to libcss.
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<B>Q: Seems to work but no sound.
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</B>A: Use '-aid 128' (or try: 128,129,...) command line switch
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<B>Q: I have got Spanish audio instead of English (or similar problems)
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</B>A: See the last question/answer.
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<B>Q: MPlayer complains about FIBMAP or something.
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</B>A: Try to run MPlayer as root.
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<B>Q: some strange effect (interlace like thing) especially when fast moving
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objects are shown in the movie
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</B>A: known problem, we try to fix it later
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<B>Q: DVD support in MPlayer is a piece of shit!
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</B>A: You're probably right :) However please contact us if you can improve it!
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<B>Q: Where can I get libcss package from?
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</B>A: Maybe from the source of OMS (www.linuxvideo.org).
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<B>Q: How can I ... (insert some expectable DVD player feature here)
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</B>A: The current implementation is only for viewing VOB files from DVD.
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Nothing more, like subtitles, menus and so on.
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<B>Q: How can I set the region code of my DVD-Drive ? I don't have windows!
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</B>A: Use the 'regionset' tool :
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http://www.linuxtv.org/download/dvd/dvd_disc_20000215.tar.gz
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<B>Q: MPlayer complains about some renamed option?
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</B>A: For future development, old '-dvd' option was replaced by '-dvdauth'.
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Option '-dvd' *WILL* do the 'full disk movie' mplaying mode.
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But until that, '-dvd' does nothing only prints error message.
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</PRE>
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</BODY>
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</HTML>
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