Add some clarifications to section 8.4.
Tighten up some headings by moving content into an existing Table. Fix some tags. To be followed by a white space fix.
This commit is contained in:
Dru Lavigne
parent
e710d5895b
commit
8334e5dd88
Notes:
svn2git
2020-12-08 03:00:23 +00:00
svn path=/head/; revision=43033
1 changed files with 101 additions and 226 deletions
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@ -32,7 +32,7 @@
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recorded audio, adding sound effects, and controlling attached
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MIDI devices.</para>
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<para>&os; also supports the playback of video files and DVDs.
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<para>&os; also supports the playback of video files and <acronym>DVD</acronym>s.
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The &os; Ports Collection contains applications to encode,
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convert, and playback various video media.</para>
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@ -61,12 +61,12 @@
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</listitem>
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<listitem>
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<para>Play DVDs, <filename>.mpg</filename>, and
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<para>Play <acronym>DVD</acronym>s, <filename>.mpg</filename>, and
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<filename>.avi</filename> files.</para>
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</listitem>
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<listitem>
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<para>Rip CD and DVD content into files.</para>
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<para>Rip CD and <acronym>DVD</acronym> content into files.</para>
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</listitem>
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<listitem>
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@ -713,48 +713,47 @@ MPEG 1.0 layer III, 128 kbit/s, 44100 Hz joint-stereo</screen>
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</sect1>
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<sect1 id="video-playback">
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<!--
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<sect1info>
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<authorgroup>
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<author>
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<firstname>Ross</firstname>
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<surname>Lippert</surname>
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<contrib>Contributed by </contrib>
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<contrib>Contributed by in June 2002</contrib>
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</author>
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</authorgroup>
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<!-- 5 June 2002 -->
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</sect1info>
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-->
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<title>Video Playback</title>
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<para>Before configuring video playback, determine the model
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of the video card and the chip it uses. While
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and chipset of the video card. While
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<application>&xorg;</application> supports a wide variety of
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video cards, fewer give good playback performance. To obtain
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video cards, not all provide good playback performance. To obtain
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a list of extensions supported by the
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<application>&xorg;</application> server using the card, run
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&man.xdpyinfo.1; while <application>&xorg;</application> is
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<command>xdpyinfo</command> while <application>&xorg;</application> is
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running.</para>
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<para>It is a good idea to have a short MPEG test file for
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evaluating various players and options. Since some DVD
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applications look for DVD media in <filename
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evaluating various players and options. Since some <acronym>DVD</acronym>
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applications look for <acronym>DVD</acronym> media in <filename
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class="directory">/dev/dvd</filename> by default, or have this
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device name hardcoded in them, it might be useful to make
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symbolic links to the proper devices:</para>
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device name hardcoded in them, it might be useful to make a
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symbolic links to the proper device:</para>
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<screen>&prompt.root; <userinput>ln -sf /dev/acd0 /dev/dvd</userinput>
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&prompt.root; <userinput>ln -sf /dev/acd0 /dev/rdvd</userinput></screen>
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<screen>&prompt.root; <userinput>ln -sf /dev/cd0 /dev/dvd</userinput></screen>
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<para>Due to the nature of &man.devfs.5;, manually created links
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will not persist after a system reboot. In order to create the
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symbolic links automatically when the system boots, add the
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following lines to <filename>/etc/devfs.conf</filename>:</para>
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will not persist after a system reboot. In order to recreate the
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symbolic link automatically when the system boots, add the
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following line to <filename>/etc/devfs.conf</filename>:</para>
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<programlisting>link acd0 dvd
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link acd0 rdvd</programlisting>
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<programlisting>link cd0 dvd</programlisting>
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<para>DVD decryption invokes special DVD-ROM functions and
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requires write permission on the DVD devices.</para>
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<para><acronym>DVD</acronym> decryption invokes certain functions that
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require write permission to the <acronym>DVD</acronym> device.</para>
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<para>To enhance the shared memory
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<application>&xorg;</application> interface, it is
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@ -772,7 +771,7 @@ kern.ipc.shmall=32768</programlisting>
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<indexterm><primary>DGA</primary></indexterm>
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<para>There are several possible ways to display video under
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<application>&xorg;</application>. What works is largely
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<application>&xorg;</application> and what works is largely
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hardware dependent. Each method described below will have
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varying quality across different hardware.</para>
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@ -786,41 +785,52 @@ kern.ipc.shmall=32768</programlisting>
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<listitem>
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<para>XVideo: an extension to the
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<application>&xorg;</application> interface which supports
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video in any drawable object.</para>
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<application>&xorg;</application> interface which
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allows video to be directly displayed in drawable objects
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through a special acceleration. This extension provides
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good quality playback even on low-end machines. The next section describes
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how to determine if this extension is running.</para>
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</listitem>
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<listitem>
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<para><acronym>SDL</acronym>: the Simple Directmedia
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Layer.</para>
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Layer is a porting layer for many operating systems,
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allowing cross-platform applications to be developed which make
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efficient use of sound and graphics. <acronym>SDL</acronym> provides a
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low-level abstraction to the hardware which can sometimes be
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more efficient than the <application>&xorg;</application>
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interface. On &os;, <acronym>SDL</acronym> can be installed using the <filename
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role="package">devel/sdl20</filename> package or port.</para>
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</listitem>
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<listitem>
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<para><acronym>DGA</acronym>: the Direct Graphics
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Access.</para>
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Access is an
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<application>&xorg;</application> extension which allows a
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program to bypass the <application>&xorg;</application> server
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and directly alter the framebuffer. Because it relies on a low
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level memory mapping, programs using it must be run as
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<username>root</username>. The <acronym>DGA</acronym> extension can be tested and
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benchmarked using &man.dga.1;. When <command>dga</command> is
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running, it changes the colors of the display whenever a key is
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pressed. To quit, press <keycap>q</keycap>.</para>
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</listitem>
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<listitem>
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<para>SVGAlib: low level console graphics layer.</para>
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<para>SVGAlib: a low level console graphics layer.</para>
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</listitem>
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</orderedlist>
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<sect3 id="video-interface-xvideo">
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<title>XVideo</title>
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<para><application>&xorg;</application> has an extension called
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<emphasis>XVideo</emphasis>, also known as Xvideo, Xv, and xv.
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It allows video to be directly displayed in drawable objects
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through a special acceleration. This extension provides
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good quality playback even on low-end machines.</para>
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<para>To check whether the extension is running, use
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<para>To check whether this extension is running, use
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<command>xvinfo</command>:</para>
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<screen>&prompt.user; <userinput>xvinfo</userinput></screen>
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<para>XVideo is supported for the card if the result looks
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like:</para>
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<para>XVideo is supported for the card if the result is similar
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to:</para>
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<screen>X-Video Extension version 2.2
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screen #0
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@ -895,7 +905,7 @@ kern.ipc.shmall=32768</programlisting>
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with every implementation of XVideo and their absence may hinder
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some players.</para>
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<para>If the result looks like:</para>
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<para>If the result instead looks like:</para>
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<screen>X-Video Extension version 2.2
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screen #0
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@ -903,42 +913,8 @@ no adaptors present</screen>
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<para>XVideo is probably not supported for the card. This means
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that it will be more difficult for the display to meet the
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computational demands of rendering video. Depending on the
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video card and processor, one might still be able to have a
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satisfying experience.</para>
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</sect3>
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<sect3 id="video-interface-SDL">
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<title>Simple Directmedia Layer</title>
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<para>The Simple Directmedia Layer, SDL, is a
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porting layer for many operating systems
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allowing cross-platform applications to be developed which make
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efficient use of sound and graphics. The SDL layer provides a
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low-level abstraction to the hardware which can sometimes be
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more efficient than the <application>&xorg;</application>
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interface.</para>
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<para><acronym>SDL</acronym> can be installed using the <filename
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role="package">devel/sdl12</filename> package or port.</para>
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</sect3>
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<sect3 id="video-interface-DGA">
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<title>Direct Graphics Access</title>
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<para><acronym>DGA</acronym> is an
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<application>&xorg;</application> extension which allows a
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program to bypass the <application>&xorg;</application> server
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and directly alter the framebuffer. Because it relies on a low
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level memory mapping, programs using it must be run as
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<username>root</username>.</para>
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<para>The <acronym>DGA</acronym> extension can be tested and
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benchmarked using &man.dga.1;. When <command>dga</command> is
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running, it changes the colors of the display whenever a key is
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pressed. To quit, press <keycap>q</keycap>.</para>
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computational demands of rendering video, depending on the
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video card and processor.</para>
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</sect3>
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</sect2>
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@ -953,101 +929,26 @@ no adaptors present</screen>
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the &os; Ports Collection which can be used for video
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playback.</para>
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<para>Many of the video applications which run on &os; were
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developed as &linux; applications. Many of these applications
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are still beta-quality. Some of the problems commonly
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encountered with video packages on &os; include:</para>
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<orderedlist>
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<listitem>
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<para>An application cannot playback a file which another
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application produced.</para>
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</listitem>
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<listitem>
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<para>An application cannot playback a file which the
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application itself produced.</para>
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</listitem>
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<listitem>
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<para>The same application on two different machines,
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rebuilt on each machine for that machine, plays back the
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same file differently.</para>
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</listitem>
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<listitem>
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<para>A seemingly trivial filter, like rescaling of the image
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size, results in bad artifacts from a buggy rescaling
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routine.</para>
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</listitem>
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<listitem>
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<para>An application frequently dumps core.</para>
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</listitem>
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<listitem>
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<para>Documentation is not installed with the port and can be
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found either on the web or under the port's <filename
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class='directory'>work</filename>
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directory.</para>
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</listitem>
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</orderedlist>
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<para>Many applications may also exhibit
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<quote>&linux;-isms</quote>. There may be issues resulting from
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the way some standard libraries are implemented in the &linux;
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distributions, or some features of the &linux; kernel which have
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been assumed by the authors of the applications. These issues
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are not always noticed and worked around by the port
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maintainers, which can lead to problems like these:</para>
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<orderedlist>
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<listitem>
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<para>The use of <filename>/proc/cpuinfo</filename> to detect
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processor characteristics.</para>
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</listitem>
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<listitem>
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<para>A misuse of threads which causes a program to hang upon
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completion instead of truly terminating.</para>
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</listitem>
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<listitem>
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<para>Relies on software which is not yet available in the
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&os; Ports Collection.</para>
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</listitem>
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</orderedlist>
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<sect3 id="video-mplayer">
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<title>MPlayer</title>
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<title><application>MPlayer</application> and <application>MEncoder</application></title>
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<para><application>MPlayer</application> is a command-line video
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player with an optional graphical interface which aims to
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provide speed and flexibility. This application, as well as
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other graphical front-ends, is available from the &os; Ports
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provide speed and flexibility. Other
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graphical front-ends to <application>MPlayer</application> are available from the &os; Ports
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Collection.</para>
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<sect4 id="video-mplayer-building">
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<title>Building MPlayer</title>
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<indexterm><primary>MPlayer</primary></indexterm>
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<indexterm><primary>MPlayer</primary>
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<secondary>making</secondary></indexterm>
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<para><application>MPlayer</application> is available as a
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package or port in <filename
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role="package">multimedia/mplayer</filename>. Several
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<para><application>MPlayer</application> can be installed using
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the <filename
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role="package">multimedia/mplayer</filename> package or port. Several
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compile options are available and a variety of hardware
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checks occur during the build process. For these reasons,
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some users prefer to build the port rather than install the
|
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package. The available options will be displayed in a
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menu after these commands are input:</para>
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package.</para>
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<screen>&prompt.root; <userinput>cd /usr/ports/multimedia/mplayer</userinput>
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&prompt.root; <userinput>make</userinput></screen>
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<para>The menu options should be reviewed to determine the
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<para>When compiling the port, the menu options should be reviewed to determine the
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type of support to compile into the port. If an option is
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not selected, <application>MPlayer</application> will not be
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able to display that type of video format. Use the arrow
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@ -1055,21 +956,13 @@ no adaptors present</screen>
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finished, press <keycap>Enter</keycap> to continue the port
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compile and installation.</para>
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<para>By default, this package or port will build the
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<para>By default, the package or port will build the
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<command>mplayer</command> command line utility and the
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<command>gmplayer</command> graphical utility. To encode
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videos, install the <filename
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videos, compile the <filename
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role="package">multimedia/mencoder</filename> port. Due
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to licensing restrictions, a package is not available for
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<command>MEncoder</command>.</para>
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</sect4>
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<sect4 id="video-mplayer-using">
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<title>Using MPlayer</title>
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<indexterm><primary>MPlayer</primary>
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<secondary>use</secondary></indexterm>
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<application>MEncoder</application>.</para>
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<para>The first time <application>MPlayer</application> is
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run, it will create <filename
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@ -1078,13 +971,13 @@ no adaptors present</screen>
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of the user-specific configuration files.</para>
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<para>This section describes only a few common uses. Refer
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to the <command>mplayer</command> manual page for a complete
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to mplayer(1) for a complete
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description of its numerous options.</para>
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<para>To play the file
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<filename><replaceable>testfile.avi</replaceable></filename>,
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specify the video interfaces with
|
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<option>-vo</option>:</para>
|
||||
<option>-vo</option>, as seen in the following examples:</para>
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||||
|
||||
<screen>&prompt.user; <userinput>mplayer -vo xv <replaceable>testfile.avi</replaceable></userinput></screen>
|
||||
|
||||
|
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@ -1100,31 +993,31 @@ no adaptors present</screen>
|
|||
relative performance depends on many factors and will vary
|
||||
significantly with hardware.</para>
|
||||
|
||||
<para>To play a DVD, replace the
|
||||
<para>To play a <acronym>DVD</acronym>, replace
|
||||
<filename><replaceable>testfile.avi</replaceable></filename>
|
||||
with <option>dvd://<replaceable>N</replaceable> -dvd-device
|
||||
<replaceable>DEVICE</replaceable></option>, where
|
||||
<replaceable>N</replaceable> is the title number to play
|
||||
and <filename><replaceable>DEVICE</replaceable></filename>
|
||||
is the device node for the DVD-ROM. For example, to play
|
||||
and <replaceable>DEVICE</replaceable>
|
||||
is the device node for the <acronym>DVD</acronym>. For example, to play
|
||||
title 3 from <devicename>/dev/dvd</devicename>:</para>
|
||||
|
||||
<screen>&prompt.root; <userinput>mplayer -vo xv dvd://3 -dvd-device /dev/dvd</userinput></screen>
|
||||
|
||||
<note>
|
||||
<para>The default DVD device can be defined during the build
|
||||
<para>The default <acronym>DVD</acronym> device can be defined during the build
|
||||
of the <application>MPlayer</application> port by
|
||||
including the
|
||||
<makevar>WITH_DVD_DEVICE=/path/to/desired/device</makevar>
|
||||
option. By default, the device is
|
||||
<filename>/dev/acd0</filename>. More details can be found
|
||||
<filename>/dev/cd0</filename>. More details can be found
|
||||
in the port's
|
||||
<filename>Makefile.options</filename>.</para>
|
||||
</note>
|
||||
|
||||
<para>To stop, pause, advance, and so on, consult the
|
||||
keybindings, which are displayed by running <command>mplayer
|
||||
-h</command>, or read the manual page.</para>
|
||||
<para>To stop, pause, advance, and so on, use a
|
||||
keybinding. To see the list of keybindings, run <command>mplayer
|
||||
-h</command> or read mplayer(1).</para>
|
||||
|
||||
<para>Additional playback options include
|
||||
<option>-fs -zoom</option>, which engages fullscreen mode,
|
||||
|
|
@ -1138,38 +1031,28 @@ no adaptors present</screen>
|
|||
fs=yes
|
||||
zoom=yes</programlisting>
|
||||
|
||||
<para><command>mplayer</command> can be used to rip a DVD
|
||||
<para><command>mplayer</command> can be used to rip a <acronym>DVD</acronym>
|
||||
title to a <filename>.vob</filename>. To dump the second
|
||||
title from a DVD:</para>
|
||||
title from a <acronym>DVD</acronym>:</para>
|
||||
|
||||
<screen>&prompt.root; <userinput>mplayer -dumpstream -dumpfile out.vob dvd://2 -dvd-device /dev/dvd</userinput></screen>
|
||||
|
||||
<para>The output file, <filename>out.vob</filename>, will be
|
||||
MPEG and can be manipulated by the other packages described
|
||||
in this section.</para>
|
||||
in <acronym>MPEG</acronym> format.</para>
|
||||
|
||||
<para>The <ulink url="http://www.mplayerhq.hu/DOCS/">MPlayer
|
||||
documentation</ulink> is technically informative and
|
||||
should be consulted by anyone wishing to obtain a high level
|
||||
of expertise with &unix; video. The
|
||||
<application>MPlayer</application> mailing list is hostile
|
||||
to anyone who has not bothered to read the documentation, so
|
||||
before making a bug report, read the documentation
|
||||
first.</para>
|
||||
|
||||
</sect4>
|
||||
<sect4 id="video-mencoder">
|
||||
<title><application>MEncoder</application></title>
|
||||
<para>Anyone wishing to obtain a high level
|
||||
of expertise with &unix; video should consult <ulink url="http://www.mplayerhq.hu/DOCS/">mplayerhq.hu/DOCS</ulink> as it is technically informative.
|
||||
This documentation should be considered as required reading
|
||||
before submitting any bug reports.</para>
|
||||
|
||||
<indexterm>
|
||||
<primary>mencoder</primary>
|
||||
</indexterm>
|
||||
|
||||
<para>Before using <command>mencoder</command>, it is a good
|
||||
idea to become familiar with the options described in the
|
||||
idea to become familiar with the options described at
|
||||
<ulink
|
||||
url="http://www.mplayerhq.hu/DOCS/HTML/en/mencoder.html">HTML
|
||||
documentation</ulink>. There are innumerable ways to
|
||||
url="http://www.mplayerhq.hu/DOCS/HTML/en/mencoder.html">mplayerhq.hu/DOCS/HTML/en/mencoder.html</ulink>. There are innumerable ways to
|
||||
improve quality, lower bitrate, and change formats, and some
|
||||
of these options may make the difference between good or bad
|
||||
performance. Improper combinations of command line options
|
||||
|
|
@ -1200,11 +1083,9 @@ zoom=yes</programlisting>
|
|||
<para><filename><replaceable>input.avi</replaceable></filename>
|
||||
can be replaced with <option>dvd://1 -dvd-device
|
||||
/dev/dvd</option> and run as <username>root</username>
|
||||
to re-encode a DVD title directly. Since it may take a few
|
||||
tries to get the desired result, it is recommended to dump
|
||||
to re-encode a <acronym>DVD</acronym> title directly. Since it may take a few
|
||||
tries to get the desired result, it is recommended to instead dump
|
||||
the title to a file and to work on the file.</para>
|
||||
</sect4>
|
||||
|
||||
</sect3>
|
||||
|
||||
<sect3 id="video-xine">
|
||||
|
|
@ -1226,40 +1107,35 @@ zoom=yes</programlisting>
|
|||
to open a specific file.</para>
|
||||
|
||||
<para>Alternatively, <application>xine</application> may be
|
||||
invoked to play a file immediately without the graphical
|
||||
interface:</para>
|
||||
|
||||
<screen>&prompt.user; <userinput>xine</userinput></screen>
|
||||
|
||||
<para>Alternatively, it may be invoked to play a file
|
||||
immediately without the GUI with the command:</para>
|
||||
invoked from the command line
|
||||
by specifying the name of the file to play:</para>
|
||||
|
||||
<screen>&prompt.user; <userinput>xine -g -p <replaceable>mymovie.avi</replaceable></userinput></screen>
|
||||
|
||||
<para>The <ulink
|
||||
url="http://dvd.sourceforge.net/xine-howto/en_GB/html/howto.html">
|
||||
xine HOWTO</ulink> contains a chapter on performance
|
||||
improvement which is general to all players.</para>
|
||||
<para>Refer to <ulink
|
||||
url="http://www.xine-project.org/faq">
|
||||
xine-project.org/faq</ulink> for more information and
|
||||
troubleshooting tips.</para>
|
||||
</sect3>
|
||||
|
||||
<sect3 id="video-ports-transcode">
|
||||
<title>The <application>transcode</application>
|
||||
<title>The <application>Transcode</application>
|
||||
Utilities</title>
|
||||
|
||||
<para><application>transcode</application> provides a suite of
|
||||
<para><application>Transcode</application> provides a suite of
|
||||
tools for re-encoding video and audio files.
|
||||
<application>transcode</application> can be used to merge
|
||||
<application>Transcode</application> can be used to merge
|
||||
video files or repair broken files using command line tools
|
||||
with <filename>stdin/stdout</filename> stream
|
||||
with stdin/stdout stream
|
||||
interfaces.</para>
|
||||
|
||||
<para><application>transcode</application> can be installed
|
||||
<para>In &os;, <application>Transcode</application> can be installed
|
||||
using the <filename
|
||||
role="package">multimedia/transcode</filename> package or
|
||||
port. Many users prefer to compile the port as it provides a
|
||||
menu of compile options for specifying the support and codecs
|
||||
to compile in. If an option is not selected,
|
||||
<application>transcode</application> will not be able to
|
||||
<application>Transcode</application> will not be able to
|
||||
encode that format. Use the arrow keys and spacebar to select
|
||||
the required formats. When finished, press
|
||||
<keycap>Enter</keycap> to continue the port compile and
|
||||
|
|
@ -1272,18 +1148,17 @@ zoom=yes</programlisting>
|
|||
<replaceable>input.avi</replaceable> -V --export_prof vcd-pal -o output_vcd</userinput>
|
||||
&prompt.user; <userinput>mplex -f 1 -o <replaceable>output_vcd.mpg output_vcd.m1v output_vcd.mpa</replaceable></userinput></screen>
|
||||
|
||||
<para>The resulting MPEG file,
|
||||
<para>The resulting <acronym>MPEG</acronym> file,
|
||||
<filename><replaceable>output_vcd.mpg</replaceable></filename>,
|
||||
is ready to be played with <application>MPlayer</application>.
|
||||
The file can be burned on a CD-R media to create a Video CD. In
|
||||
this, install and use the <filename
|
||||
role="package">multimedia/vcdimager</filename> and <filename
|
||||
role="package">sysutils/cdrdao</filename> programs.</para>
|
||||
The file can be burned on a <acronym>CD</acronym> media to create a video <acronym>CD</acronym> using a utility such as
|
||||
<filename
|
||||
role="package">multimedia/vcdimager</filename> or <filename
|
||||
role="package">sysutils/cdrdao</filename>.</para>
|
||||
|
||||
<para>In addition to the manual page for
|
||||
<command>transcode</command>, refer to the <ulink
|
||||
url="http://www.transcoding.org/cgi-bin/transcode">transcode
|
||||
wiki</ulink> for further information and examples.</para>
|
||||
<command>transcode</command>, refer to <ulink
|
||||
url="http://www.transcoding.org/cgi-bin/transcode">transcoding.org/cgi-bin/transcode</ulink> for further information and examples.</para>
|
||||
</sect3>
|
||||
</sect2>
|
||||
</sect1>
|
||||
|
|
|
|||
Loading…
Reference in a new issue