mpeg_decoders.html

来自「MPlayer-mingw32-1.0rc2.zip 经典播放器源码」· HTML 代码 · 共 270 行 · 第 1/2 页

<tt class="filename">~/.mplayer/menu.conf</tt>), the main menu will show a
sub-menu entry that will permit you to choose one of the channels present
in your <tt class="filename">channels.conf</tt>, possibly preceded by a menu
with the list of cards available if more than one is usable by
<span class="application">MPlayer</span>.
</p><p>
If you want to save a program to disk you can use
</p><pre class="screen">
mplayer -dumpfile <em class="replaceable"><code>r1.ts</code></em> -dumpstream dvb://<em class="replaceable"><code>R1</code></em>
</pre><p>
</p><p>
If you want to record it in a different format (re-encoding it) instead
you can run a command such as
</p><pre class="screen">
mencoder -o <em class="replaceable"><code>r1.avi</code></em> -ovc xvid -xvidencopts bitrate=800 \
    -oac mp3lame -lameopts cbr:br=128 -pp=ci dvb://<em class="replaceable"><code>R1</code></em>
</pre><p>
</p><p>
Read the man page for a list of options that you can pass to the
DVB input module.
</p><p><b>FUTURE.聽</b>
If you have questions or want to hear feature announcements and take part in
discussions on this subject, join our
<a class="ulink" href="http://lists.mplayerhq.hu/mailman/listinfo/mplayer-dvb" target="_top">MPlayer-DVB</a>
mailing list. Please remember that the list language is English.
</p><p>
In the future you may expect the ability to display OSD and subtitles using
the native OSD feature of DVB cards, as well as more fluent playback of
non-25fps movies and realtime transcoding between MPEG-2 and MPEG-4 (partial
decompression).
</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="dxr2"></a>8.18.2.聽DXR2</h3></div></div></div><p>
<span class="application">MPlayer</span> supports hardware accelerated playback
with the Creative DXR2 card.
</p><p>
First of all you will need properly installed DXR2 drivers. You can find
the drivers and installation instructions at the
<a class="ulink" href="http://dxr2.sf.net/" target="_top">DXR2 Resource Center</a> site.
</p><div class="variablelist"><p class="title"><b>USAGE</b></p><dl><dt><span class="term"><tt class="option">-vo dxr2</tt></span></dt><dd><p>Enable TV output.</p></dd><dt><span class="term"><tt class="option">-vo dxr2:x11</tt> or <tt class="option">-vo dxr2:xv</tt></span></dt><dd><p>Enable Overlay output in X11.</p></dd><dt><span class="term"><tt class="option">-dxr2 &lt;option1:option2:...&gt;</tt></span></dt><dd><p>
  This option is used to control the DXR2 driver.
  </p></dd></dl></div><p>
The overlay chipset used on the DXR2 is of pretty bad quality but the
default settings should work for everybody. The OSD may be usable with the
overlay (not on TV) by drawing it in the colorkey. With the default colorkey
settings you may get variable results, usually you will see the colorkey
around the characters or some other funny effect. But if you properly adjust
the colorkey settings you should be able to get acceptable results.
</p><p>Please see the man page for available options.</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="dxr3"></a>8.18.3.聽DXR3/Hollywood+</h3></div></div></div><p>
<span class="application">MPlayer</span> supports hardware accelerated playback
with the Creative DXR3 and Sigma Designs Hollywood Plus cards. These cards
both use the em8300 MPEG decoder chip from Sigma Designs.
</p><p>
First of all you will need properly installed DXR3/H+ drivers, version 0.12.0
or later. You can find the drivers and installation instructions at the
<a class="ulink" href="http://dxr3.sf.net/" target="_top">DXR3 &amp; Hollywood Plus for Linux</a>
site. <tt class="filename">configure</tt> should detect your card automatically,
compilation should go without problems.
</p><div class="variablelist"><p class="title"><b>USAGE</b></p><dl><dt><span class="term"><tt class="option">-vo dxr3:prebuf:sync:norm=x:<em class="replaceable"><code>device</code></em></tt></span></dt><dd><p>
<tt class="option">overlay</tt> activates the overlay instead of TVOut. It requires
that you have a properly configured overlay setup to work right. The easiest
way to configure the overlay is to first run autocal. Then run mplayer with
dxr3 output and without overlay turned on, run dxr3view. In dxr3view you can
tweak the overlay settings and see the effects in realtime, perhaps this feature
will be supported by the <span class="application">MPlayer</span> GUI in the future.
When overlay is properly set up you will no longer need to use dxr3view.
<tt class="option">prebuf</tt> turns on prebuffering. Prebuffering is a feature of the
em8300 chip that enables it to hold more than one frame of video at a time.
This means that when you are running with prebuffering
<span class="application">MPlayer</span> will try to keep the video buffer filled
with data at all times.
If you are on a slow machine <span class="application">MPlayer</span> will probably
use close to, or precisely 100% of CPU.
This is especially common if you play pure MPEG streams
(like DVDs, SVCDs a.s.o.) since <span class="application">MPlayer</span> will not have
to reencode it to MPEG it will fill the buffer very fast.
With prebuffering video playback is <span class="bold"><strong>much</strong></span>
less sensitive to other programs hogging the CPU, it will not drop frames unless
applications hog the CPU for a long time.
When running without prebuffering the em8300 is much more sensitive to CPU load,
so it is highly suggested that you turn on <span class="application">MPlayer</span>'s
<tt class="option">-framedrop</tt> option to avoid further loss of sync.
<tt class="option">sync</tt> will turn on the new sync-engine. This is currently an
experimental feature. With the sync feature turned on the em8300's internal
clock will be monitored at all times, if it starts to deviate from
<span class="application">MPlayer</span>'s clock it will be reset causing the em8300
to drop any frames that are lagging behind.
<tt class="option">norm=x</tt> will set the TV norm of the DXR3 card without the need
for external tools like em8300setup. Valid norms are 5 = NTSC, 4 = PAL-60,
3 = PAL. Special norms are 2 (auto-adjust using PAL/PAL-60) and 1 (auto-adjust
using PAL/NTSC) because they decide which norm to use by looking at the frame
rate of the movie. norm = 0 (default) does not change the current norm.
<tt class="option"><em class="replaceable"><code>device</code></em></tt> = device number to use if
you have more than one em8300 card. Any of these options may be left out.
<tt class="option">:prebuf:sync</tt> seems to work great when playing MPEG-4 (DivX)
movies. People have reported problems using the prebuf option when playing
MPEG-1/2 files.
You might want to try running without any options first, if you have sync
problems, or DVD subtitle problems, give <tt class="option">:sync</tt> a try.
</p></dd><dt><span class="term"><tt class="option">-ao oss:/dev/em8300_ma-<em class="replaceable"><code>X</code></em></tt></span></dt><dd><p>
  For audio output, where <em class="replaceable"><code>X</code></em> is the device number
  (0 if one card).
  </p></dd><dt><span class="term"><tt class="option">-af resample=<em class="replaceable"><code>xxxxx</code></em></tt></span></dt><dd><p>
  The em8300 cannot play back samplerates lower than 44100Hz. If the sample
  rate is below 44100Hz select either 44100Hz or 48000Hz depending on which
  one matches closest. I.e. if the movie uses 22050Hz use 44100Hz as
  44100 / 2 = 22050, if it is 24000Hz use 48000Hz as 48000 / 2 = 24000
  and so on.
  This does not work with digital audio output (<tt class="option">-ac hwac3</tt>).
  </p></dd><dt><span class="term"><tt class="option">-vf lavc</tt></span></dt><dd><p>
  To watch non-MPEG content on the em8300 (i.e. MPEG-4 (DivX) or RealVideo)
  you have to specify an MPEG-1 video filter such as
  <code class="systemitem">libavcodec</code> (lavc).
  See the man page for further info about <tt class="option">-vf lavc</tt>.
  Currently there is no way of setting the fps of the em8300 which means that
  it is fixed to 30000/1001 fps.
  Because of this it is highly recommended that you use
  <tt class="option">-vf lavc=<em class="replaceable"><code>quality</code></em>:25</tt>
  especially if you are using prebuffering. Then why 25 and not 30000/1001?
  Well, the thing is that when you use 30000/1001 the picture becomes a bit
  jumpy.
  The reason for this is unknown to us.
  If you set it to somewhere between 25 and 27 the picture becomes stable.
  For now all we can do is accept this for a fact.
  </p></dd><dt><span class="term"><tt class="option">-vf expand=-1:-1:-1:-1:1</tt></span></dt><dd><p>
  Although the DXR3 driver can put some OSD onto the MPEG-1/2/4 video, it has
  much lower quality than <span class="application">MPlayer</span>'s traditional OSD,
  and has several refresh problems as well. The command line above will firstly
  convert the input video to MPEG-4 (this is mandatory, sorry), then apply an
  expand filter which won't expand anything (-1: default), but apply the normal
  OSD onto the picture (that's what the "1" at the end does).
  </p></dd><dt><span class="term"><tt class="option">-ac hwac3</tt></span></dt><dd><p>
  The em8300 supports playing back AC-3 audio (surround sound) through the
  digital audio output of the card. See the <tt class="option">-ao oss</tt> option
  above, it must be used to specify the DXR3's output instead of a sound card.
  </p></dd></dl></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="dfbmga.html">Prev</a>聽</td><td width="20%" align="center"><a accesskey="u" href="video.html">Up</a></td><td width="40%" align="right">聽<a accesskey="n" href="other.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">8.17.聽DirectFB/Matrox (dfbmga)聽</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">聽8.19.聽Other visualization hardware</td></tr></table></div></body></html>