svgalib.html
来自「MPlayer-mingw32-1.0rc2.zip 经典播放器源码」· HTML 代码 · 共 43 行
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>8.5.聽SVGAlib</title><link rel="stylesheet" href="default.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="MPlayer - The Movie Player"><link rel="up" href="video.html" title="Chapter聽8.聽Video output devices"><link rel="prev" href="sdl.html" title="8.4.聽SDL"><link rel="next" href="fbdev.html" title="8.6.聽Framebuffer output (FBdev)"><link rel="preface" href="howtoread.html" title="How to read this documentation"><link rel="chapter" href="intro.html" title="Chapter聽1.聽Introduction"><link rel="chapter" href="install.html" title="Chapter聽2.聽Installation"><link rel="chapter" href="usage.html" title="Chapter聽3.聽Usage"><link rel="chapter" href="cd-dvd.html" title="Chapter聽4.聽CD/DVD usage"><link rel="chapter" href="faq.html" title="Chapter聽5.聽Frequently Asked Questions"><link rel="chapter" href="containers.html" title="Chapter聽6.聽Containers"><link rel="chapter" href="codecs.html" title="Chapter聽7.聽Codecs"><link rel="chapter" href="video.html" title="Chapter聽8.聽Video output devices"><link rel="chapter" href="audio.html" title="Chapter聽9.聽Audio output devices"><link rel="chapter" href="tv.html" title="Chapter聽10.聽TV"><link rel="chapter" href="radio.html" title="Chapter聽11.聽Radio"><link rel="chapter" href="ports.html" title="Chapter聽12.聽Ports"><link rel="chapter" href="mencoder.html" title="Chapter聽13.聽Basic usage of MEncoder"><link rel="chapter" href="encoding-guide.html" title="Chapter聽14.聽Encoding with MEncoder"><link rel="appendix" href="bugreports.html" title="Appendix聽A.聽How to report bugs"><link rel="appendix" href="bugs.html" title="Appendix聽B.聽Known bugs"><link rel="appendix" href="skin.html" title="Appendix聽C.聽MPlayer skin format"><link rel="appendix" href="history.html" title="Appendix聽D.聽History"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">8.5.聽SVGAlib</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sdl.html">Prev</a>聽</td><th width="60%" align="center">Chapter聽8.聽Video output devices</th><td width="20%" align="right">聽<a accesskey="n" href="fbdev.html">Next</a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="svgalib"></a>8.5.聽SVGAlib</h2></div></div></div><p><b>INSTALLATION.聽</b>
You'll have to install svgalib and its development package in order for
<span class="application">MPlayer</span> build its SVGAlib driver (autodetected,
but can be forced), and don't forget to edit
<tt class="filename">/etc/vga/libvga.config</tt> to suit your card and monitor.
</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
Be sure not to use the <tt class="option">-fs</tt> switch, since it toggles the
usage of the software scaler, and it's slow. If you really need it, use the
<tt class="option">-sws 4</tt> option which will produce bad quality, but is
somewhat faster.
</p></div><p><b>EGA (4BPP) SUPPORT.聽</b>
SVGAlib incorporates EGAlib, and <span class="application">MPlayer</span> has the
possibility to display any movie in 16 colors, thus usable in the following
sets:
</p><div class="itemizedlist"><ul type="disc"><li><p>
EGA card with EGA monitor: 320x200x4bpp, 640x200x4bpp, 640x350x4bpp
</p></li><li><p>
EGA card with CGA monitor: 320x200x4bpp, 640x200x4bpp
</p></li></ul></div><p>
The bpp (bits per pixel) value must be set to 4 by hand:
<tt class="option">-bpp 4</tt>
</p><p>
The movie probably must be scaled down to fit in EGA mode:
</p><pre class="screen">-vf scale=640:350</pre><p>
or
</p><pre class="screen">-vf scale=320:200</pre><p>
</p><p>
For that we need fast but bad quality scaling routine:
</p><pre class="screen">-sws 4</pre><p>
</p><p>
Maybe automatic aspect correction has to be shut off:
</p><pre class="screen">-noaspect</pre><p>
</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
According to my experience the best image quality on
EGA screens can be achieved by decreasing the brightness a bit:
<tt class="option">-vf eq=-20:0</tt>. I also needed to lower the audio
samplerate on my box, because the sound was broken on 44kHz:
<tt class="option">-srate 22050</tt>.
</p></div><p>
You can turn on OSD and subtitles only with the <tt class="option">expand</tt>
filter, see the man page for exact parameters.
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sdl.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="fbdev.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">8.4.聽SDL聽</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">聽8.6.聽Framebuffer output (FBdev)</td></tr></table></div></body></html>
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