mirror of https://github.com/mpv-player/mpv
288 lines
10 KiB
XML
288 lines
10 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<chapter id="cd-dvd">
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<title>CD/DVD usage</title>
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<sect1 id="drives">
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<title>CD/DVD drives</title>
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<para>
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Modern CD-ROM drives can attain very high head speeds, yet some CD-ROM drives
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are capable of running at reduced speeds. There are several reasons that might
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make you consider changing the speed of a CD-ROM drive:
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</para>
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<itemizedlist>
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<listitem><para>
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There have been reports of read errors at high speeds, especially
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with badly pressed CD-ROMs. Reducing the speed can prevent data loss under
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these circumstances.
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</para></listitem>
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<listitem><para>
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Many CD-ROM drives are annoyingly loud, a lower speed may reduce the noise.
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</para></listitem>
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</itemizedlist>
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<!-- ********** -->
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<sect2 id="drives_linux">
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<title>Linux</title>
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<para>
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You can reduce the speed of IDE CD-ROM drives with <command>hdparm</command>,
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<command>setcd</command> or <command>cdctl</command>. It works like this:
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<screen>hdparm -E <replaceable>[speed]</replaceable> <replaceable>[cdrom device]</replaceable></screen>
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<screen>setcd -x <replaceable>[speed]</replaceable> <replaceable>[cdrom device]</replaceable></screen>
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<screen>cdctl -bS <replaceable>[speed]</replaceable></screen>
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</para>
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<para>
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If you are using SCSI emulation, you might have to apply the settings to the
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real IDE device, not the emulated SCSI device.
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</para>
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<para>
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If you have root privileges the following command may also help:
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<screen>echo file_readahead:2000000 > /proc/ide/<replaceable>[cdrom device]</replaceable>/settings</screen>
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</para>
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<para>
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This sets prefetched file reading to 2MB, which helps with scratched CD-ROMs.
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If you set it to too high, the drive will continuously spin up and down, and
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will dramatically decrease the performance.
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It is recommended that you also tune your CD-ROM drive
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with <command>hdparm</command>:
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<screen>hdparm -d1 -a8 -u1 <replaceable>[cdrom device]</replaceable></screen>
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</para>
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<para>
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This enables DMA access, read-ahead, and IRQ unmasking (read the
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<command>hdparm</command> man page for a detailed explanation).
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</para>
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<para>
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Please refer to
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"<filename>/proc/ide/<replaceable>[cdrom device]</replaceable>/settings</filename>"
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for fine-tuning your CD-ROM.
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</para>
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<para>
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SCSI drives do not have a uniform way of setting these parameters (Do you know
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one? Tell us!) There is a tool that works for
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<ulink url="http://das.ist.org/~georg/">Plextor SCSI drives</ulink>.
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</para>
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</sect2>
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<!-- ********** -->
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<sect2 id="drives_freebsd">
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<title>FreeBSD</title>
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<para>speed:
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<screen>
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cdcontrol [-f <replaceable>device</replaceable>] speed <replaceable>[speed]</replaceable>
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</screen>
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</para>
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<para>DMA:
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<screen>
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sysctl hw.ata.atapi_dma=1
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</screen>
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</para>
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</sect2>
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</sect1>
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<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
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<sect1 id="dvd">
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<title>DVD playback</title>
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<para>
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For the complete list of available options, please read the man page.
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The syntax to play a standard DVD is as follows:
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<screen>
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mplayer dvd://<replaceable><track></replaceable> [-dvd-device <replaceable><device></replaceable>]
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</screen>
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</para>
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<para>
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Example:
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<screen>mplayer dvd://1 -dvd-device /dev/hdc</screen>
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</para>
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<para>
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If you have compiled <application>MPlayer</application> with dvdnav support, the
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syntax is the same, except that you need to use dvdnav:// instead of dvd://.
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</para>
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<para>
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The default DVD device is <filename>/dev/dvd</filename>. If your setup
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differs, make a symlink or specify the correct device on the command
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line with the <option>-dvd-device</option> option.
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</para>
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<para>
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<application>MPlayer</application> uses <systemitem>libdvdread</systemitem> and
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<systemitem>libdvdcss</systemitem> for DVD playback and decryption. These two
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libraries are contained in the
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<application>MPlayer</application> source tree, you do not have
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to install them separately. You can also use system-wide versions of the two
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libraries, but this solution is not recommended, as it can result in bugs,
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library incompatibilities and slower speed.
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</para>
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<note><para>
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In case of DVD decoding problems, try disabling supermount, or any other such
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facilities. Some RPC-2 drives may also require setting the region code.
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</para></note>
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<formalpara>
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<title>DVD decryption</title>
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<para>
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DVD decryption is done by <systemitem>libdvdcss</systemitem>. The method
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can be specified through the <envar>DVDCSS_METHOD</envar> environment
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variable, see the manual page for details.
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</para>
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</formalpara>
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<sect2 id="region_code">
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<title>region code</title>
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<para>
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DVD drives nowadays come with a nonsensical restriction labeled
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<ulink url="http://en.wikipedia.org/wiki/DVD_region_code">region code</ulink>.
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This is a scheme to force DVD drives to only accept DVDs produced for one of
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the six different regions into which the world was partitioned. How a group
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of people can sit around a table, come up with such an idea and expect the
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world of the 21st century to bow to their will is beyond anyone's guess.
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</para>
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<para>
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Drives that enforce region settings through software only are also known as
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RPC-1 drives, those that do it in hardware as RPC-2. RPC-2 drives allow
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changing the region code five times before it remains fixed.
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Under Linux you can use the
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<ulink url="http://linvdr.org/projects/regionset/">regionset</ulink> tool
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to set the region code of your DVD drive.
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</para>
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<para>
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Thankfully, it is possible to convert RPC-2 drives into RPC-1 drives through
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a firmware upgrade. Feed the model number of your DVD drive into your favorite
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search engine or have a look at the forum and download sections of
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<ulink url="http://www.rpc1.org/">"The firmware page"</ulink>.
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While the usual caveats for firmware upgrades apply, experience with
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getting rid of region code enforcement is generally positive.
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</para>
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</sect2>
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</sect1>
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<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
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<sect1 id="vcd">
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<title>VCD playback</title>
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<para>
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For the complete list of available options, please read the man page. The
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Syntax for a standard Video CD (VCD) is as follows:
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<screen>mplayer vcd://<replaceable><track></replaceable> [-cdrom-device <replaceable><device></replaceable>]</screen>
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Example:
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<screen>mplayer vcd://2 -cdrom-device /dev/hdc</screen>
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The default VCD device is <filename>/dev/cdrom</filename>. If your setup
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differs, make a symlink or specify the correct device on the command line
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with the <option>-cdrom-device</option> option.
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</para>
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<note><para>
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At least Plextor and some Toshiba SCSI CD-ROM drives have horrible performance
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reading VCDs. This is because the CDROMREADRAW <systemitem>ioctl</systemitem>
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is not fully implemented for these drives. If you have some knowledge of SCSI
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programming, please <ulink url="../../tech/patches.txt">help us</ulink>
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implement generic SCSI support for VCDs.
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</para></note>
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<para>
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In the meantime you can extract data from VCDs with
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<ulink url="http://ftp.ntut.edu.tw/ftp/OS/Linux/packages/X/viewers/readvcd/">readvcd</ulink>
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and play the resulting file with <application>MPlayer</application>.
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</para>
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<formalpara>
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<title>VCD structure</title>
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<para>
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A Video CD (VCD) is made up of CD-ROM XA sectors, i.e. CD-ROM mode 2
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form 1 and 2 tracks:
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<itemizedlist>
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<listitem><para>
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The first track is in mode 2 form 2 format which means it uses L2
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error correction. The track contains an ISO-9660 file system with 2048
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bytes/sector. This file system contains VCD metadata information, as
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well as still frames often used in menus. MPEG segments for menus can
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also be stored in this first track, but the MPEGs have to be broken up
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into a series of 150-sector chunks. The ISO-9660 file system may
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contain other files or programs that are not essential for VCD
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operation.
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</para></listitem>
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<listitem><para>
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The second and remaining tracks are generally raw 2324 bytes/sector
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MPEG (movie) tracks, containing one MPEG PS data packet per
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sector. These are in mode 2 form 1 format, so they store more data per
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sector at the loss of some error correction. It is also legal to have
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CD-DA tracks in a VCD after the first track as well.
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On some operating systems there is some trickery that goes on to make
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these non-ISO-9660 tracks appear in a file system. On other operating
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systems like GNU/Linux this is not the case (yet). Here the MPEG data
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<emphasis role="bold">cannot be mounted</emphasis>. As most movies are
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inside this kind of track, you should try <option>vcd://2</option>
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first.
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</para></listitem>
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<listitem><para>
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There exist VCD disks without the first track (single track and no file system
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at all). They are still playable, but cannot be mounted.
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</para></listitem>
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<listitem><para>
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The definition of the Video CD standard is called the
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Philips "White Book" and it is not generally available online as it
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must be purchased from Philips. More detailed information about Video
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CDs can be found in the
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<ulink url="http://www.vcdimager.org/pub/vcdimager/manuals/0.7/vcdimager.html#SEC4">vcdimager documentation</ulink>.
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</para></listitem>
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</itemizedlist>
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</para>
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</formalpara>
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<formalpara>
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<title>About .DAT files</title>
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<para>
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The ~600 MB file visible on the first track of the mounted VCD is not a real
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file! It is a so called ISO gateway, created to allow Windows to handle such
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tracks (Windows does not allow raw device access to applications at all).
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Under Linux you cannot copy or play such files (they contain garbage). Under
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Windows it is possible as its iso9660 driver emulates the raw reading of
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tracks in this file. To play a .DAT file you need the kernel driver which can
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be found in the Linux version of PowerDVD. It has a modified iso9660 file system
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(<filename>vcdfs/isofs-2.4.X.o</filename>) driver, which is able to emulate the
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raw tracks through this shadow .DAT file. If you mount the disc using their
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driver, you can copy and even play .DAT files with
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<application>MPlayer</application>. But it will not
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work with the standard iso9660 driver of the Linux kernel! Use
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<option>vcd://</option> instead. Alternatives for VCD copying are the
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new <ulink url="http://www.elis.rug.ac.be/~ronsse/cdfs/">cdfs</ulink> kernel
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driver (not part of the official kernel) that shows CD sessions as image files
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and <ulink url="http://cdrdao.sf.net/">cdrdao</ulink>, a bit-by-bit
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CD grabbing/copying application.
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</para>
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</formalpara>
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</sect1>
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</chapter>
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