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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>C.2.�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 V1.68.1"><link rel="start" href="index.html" title="MPlayer - The Movie Player"><link rel="up" href="bugs.html" title="Appendix�C.�Known bugs"><link rel="prev" href="bugs-special.html" title="C.1.�Special system/CPU-specific bugs/problems"><link rel="next" href="skin.html" title="Appendix�D.�MPlayer skin format"><link rel="preface" href="howtoread.html" title="How to read this documentation"><link rel="chapter" href="intro.html" title="Chapter�1.�Introduction"><link rel="chapter" href="install.html" title="Chapter�2.�Installation"><link rel="chapter" href="usage.html" title="Chapter�3.�Usage"><link rel="chapter" href="cd-dvd.html" title="Chapter�4.�CD/DVD usage"><link rel="chapter" href="faq.html" title="Chapter�5.�Frequently Asked Questions"><link rel="chapter" href="containers.html" title="Chapter�6.�Containers"><link rel="chapter" href="codecs.html" title="Chapter�7.�Codecs"><link rel="chapter" href="video.html" title="Chapter�8.�Video output devices"><link rel="chapter" href="audio.html" title="Chapter�9.�Audio output devices"><link rel="chapter" href="tv.html" title="Chapter�10.�TV"><link rel="chapter" href="ports.html" title="Chapter�11.�Ports"><link rel="chapter" href="mencoder.html" title="Chapter�12.�Basic usage of MEncoder"><link rel="chapter" href="encoding-guide.html" title="Chapter�13.�Encoding with MEncoder"><link rel="appendix" href="mailinglists.html" title="Appendix�A.�Mailing lists"><link rel="appendix" href="bugreports.html" title="Appendix�B.�How to report bugs"><link rel="appendix" href="bugs.html" title="Appendix�C.�Known bugs"><link rel="appendix" href="skin.html" title="Appendix�D.�MPlayer skin format"><link rel="appendix" href="users-vs-dev.html" title="Appendix�E.�Developer cries"><link rel="subsection" href="bugs-audio.html#bugs-delay-all" title="C.2.1.�General audio delay or jerky sound (exists with all or many files)"><link rel="subsection" href="bugs-audio.html#bugs-delay-specific" title="C.2.2.�Audio delay/de-sync specific to one or a few files"><link rel="subsection" href="bugs-audio.html#bugs-nosound" title="C.2.3.�No sound at all"><link rel="subsection" href="bugs-audio.html#bugs-nopicture" title="C.2.4.�No picture at all (just plain grey/green window)"><link rel="subsection" href="bugs-audio.html#bugs-video" title="C.2.5.�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">C.2.�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>�</td><th width="60%" align="center">Appendix�C.�Known bugs</th><td width="20%" align="right">�<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>C.2.�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>C.2.1.�General audio delay or jerky sound (exists with all or many files)</h3></div></div></div><div class="itemizedlist"><ul type="disc"><li><p>
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most common: buggy audio driver! - try to use different drivers, try ALSA 0.9 OSS
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emulation with <tt class="option">-ao oss</tt>, also try <tt class="option">-ao sdl</tt>,
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sometimes it helps. If your file plays fine with <tt class="option">-nosound</tt>, then you can be sure
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it's sound card (driver) problem.
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</p></li></ul></div><div class="itemizedlist"><ul type="disc"><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></ul></div><div class="itemizedlist"><ul type="disc"><li><p>
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samplerate problems - maybe your card doesn't support the samplerate used in your
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files - try the resampling filter (<tt class="option">-af resample=...</tt>)
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</p></li></ul></div><div class="itemizedlist"><ul type="disc"><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
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VGA card/driver</p><p>Workaround: buy a faster card or read this documentation about how to
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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>C.2.2.�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>
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</p><div class="itemizedlist"><ul type="circle"><li><p><tt class="option">-ni</tt> or <tt class="option">-nobps</tt> option (for
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non-interleaved or bad files)</p><p>and/or</p></li><li><p><tt class="option">-mc 0</tt>(required for files with badly
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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>
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keys at runtime to adjust delay</p></li></ul></div><p>
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If none of these help, please upload the file, we'll check (and fix).
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</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
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<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
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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>C.2.3.�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>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>C.2.4.�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>Workaround: read the documentation and help us adding support for it</p></li><li><p>
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auto-selected codec can't decode the file, try to select another using
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<tt class="option">-vc</tt> or <tt class="option">-vfm</tt> options
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you try to play DivX 3.x file with OpenDivX decoder or XviD
25
(<tt class="option">-vc odivx</tt>) - install DivX4Linux and recompile player
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</p></li></ul></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="bugs-video"></a>C.2.5.�Video-out problems</h3></div></div></div><p>
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First note: options <tt class="option">-fs -vm</tt> and <tt class="option">-zoom</tt> are just
28
recommendations, not (yet) supported by all drivers. So it isn't a bug if it
29
doesn't work. Only a few driver supports scaling/zooming, don't expect this from
31
</p><p><b>OSD/sub flickering.�</b>
32
</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>
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</p><p><b>Green image using mga_vid (<tt class="option">-vo mga</tt> / <tt class="option">-vo xmga</tt>).�</b>
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</p><div class="itemizedlist"><ul type="disc"><li><p>mga_vid misdetected your card's RAM amount, reload it using
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<tt class="option">mga_ram_size</tt> option
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</p></li></ul></div><p>
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</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>�</td><td width="20%" align="center"><a accesskey="u" href="bugs.html">Up</a></td><td width="40%" align="right">�<a accesskey="n" href="skin.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">C.1.�Special system/CPU-specific bugs/problems�</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">�Appendix�D.�<span class="application">MPlayer</span> skin format</td></tr></table></div></body></html>
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