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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>B.2.聽Various A-V sync and other audio problems</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="bugs.html" title="Appendix聽B.聽Known bugs"><link rel="prev" href="bugs-special.html" title="B.1.聽Special system/CPU-specific bugs/problems"><link rel="next" href="skin.html" title="Appendix聽C.聽MPlayer skin format"><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"><link rel="subsection" href="bugs-audio.html#bugs-delay-all" title="B.2.1.聽General audio delay or jerky sound (exists with all or many files)"><link rel="subsection" href="bugs-audio.html#bugs-delay-specific" title="B.2.2.聽Audio delay/de-sync specific to one or a few files"><link rel="subsection" href="bugs-audio.html#bugs-nosound" title="B.2.3.聽No sound at all"><link rel="subsection" href="bugs-audio.html#bugs-nopicture" title="B.2.4.聽No picture at all (just plain grey/green window)"><link rel="subsection" href="bugs-audio.html#bugs-video" title="B.2.5.聽Video-out problems"></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">B.2.聽Various A-V sync and other audio problems</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="bugs-special.html">Prev</a>聽</td><th width="60%" align="center">Appendix聽B.聽Known bugs</th><td width="20%" align="right">聽<a accesskey="n" href="skin.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="bugs-audio"></a>B.2.聽Various A-V sync and other audio problems</h2></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="bugs-delay-all"></a>B.2.1.聽General audio delay or jerky sound
(exists with all or many files)</h3></div></div></div><div class="itemizedlist"><ul type="disc"><li><p>
most common: buggy audio driver! - try to use different drivers, try ALSA OSS
emulation with <tt class="option">-ao oss</tt>, also try <tt class="option">-ao sdl</tt>,
sometimes it helps. If your file plays fine with <tt class="option">-nosound</tt>,
then you can be sure it's sound card (driver) problem.
</p></li><li><p>audio buffer problems (buffer size badly detected)</p><p>
Workaround: <span class="application">MPlayer</span>'s <tt class="option">-abs</tt> option
</p></li><li><p>
samplerate problems - maybe your card doesn't support the samplerate used in
your files - try the resampling filter (<tt class="option">-af resample=...</tt>)
</p></li><li><p>slow machine (CPU or VGA)</p><p>
try with <tt class="option">-vo null</tt>, if it plays well, then you have slow
VGA card/driver
</p><p>
Workaround: buy a faster card or read this documentation about how to speed up
</p><p>Also try <tt class="option">-framedrop</tt></p></li></ul></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="bugs-delay-specific"></a>B.2.2.聽Audio delay/de-sync specific to one or a few files</h3></div></div></div><div class="itemizedlist"><ul type="disc"><li><p>bad file</p><p>
Workaround:
</p><div class="itemizedlist"><ul type="circle"><li><p>
<tt class="option">-ni</tt> or <tt class="option">-nobps</tt> option
(for non-interleaved or bad files)
</p><p>and/or</p></li><li><p>
<tt class="option">-mc 0</tt>
(required for files with badly interleaved VBR audio)
</p><p>and/or</p></li><li><p>
<tt class="option">-delay</tt> or <span class="keycap"><b>+</b></span>/<span class="keycap"><b>-</b></span>
keys at runtime to adjust delay
</p></li></ul></div><p>
If none of these help, please upload the file, we'll check (and fix).
</p></li><li><p>your sound card doesn't support 48kHz playback</p><p>
Workaround: buy a better sound card... or try to decrease fps by 10%
(use <tt class="option">-fps 27</tt> for a 30fps movie) or use the resample filter
</p></li><li><p>
slow machine (if A-V is not around 0,
and the last number in the status line increasing)
</p><p>Workaround: <tt class="option">-framedrop</tt></p></li></ul></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="bugs-nosound"></a>B.2.3.聽No sound at all</h3></div></div></div><div class="itemizedlist"><ul type="disc"><li><p>your file uses an unsupported audio codec</p><p>
Solution: read the documentation and help us adding support for it
</p></li></ul></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="bugs-nopicture"></a>B.2.4.聽No picture at all (just plain grey/green window)</h3></div></div></div><div class="itemizedlist"><ul type="disc"><li><p>your file uses an unsupported video codec</p><p>
Solution: read the documentation and help us adding support for it
</p></li><li><p>
auto-selected codec can't decode the file, try to select another using
<tt class="option">-vc</tt> or <tt class="option">-vfm</tt> options
</p></li></ul></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="bugs-video"></a>B.2.5.聽Video-out problems</h3></div></div></div><p>
First note that the options <tt class="option">-fs</tt>, <tt class="option">-vm</tt> and
<tt class="option">-zoom</tt> are not supported by all drivers. Plus, not all
drivers support scaling/zooming in hardware.
</p><p><b>OSD/sub flickering.聽</b>
</p><div class="itemizedlist"><ul type="disc"><li><p>x11 driver: sorry, it can't be fixed now</p></li><li><p>xv driver: use <tt class="option">-double</tt> option</p></li></ul></div><p>
</p><p><b>Green image using mga_vid
(<tt class="option">-vo mga</tt> / <tt class="option">-vo xmga</tt>).聽</b>
</p><div class="itemizedlist"><ul type="disc"><li><p>
mga_vid misdetected your card's RAM amount, reload it using
<tt class="option">mga_ram_size</tt> option.
</p></li></ul></div><p>
</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bugs-special.html">Prev</a>聽</td><td width="20%" align="center"><a accesskey="u" href="bugs.html">Up</a></td><td width="40%" align="right">聽<a accesskey="n" href="skin.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">B.1.聽Special system/CPU-specific bugs/problems聽</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">聽Appendix聽C.聽<span class="application">MPlayer</span> skin format</td></tr></table></div></body></html>
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