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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<appendix id="bugs">
<title>Known bugs</title>
<sect1 id="bugs-special">
<title>Special system/CPU-specific bugs/problems</title>
<itemizedlist>
<listitem>
<para>General SIGILL (signal 4):</para>
<para>
Problem: you compiled and run <application>MPlayer</application> on
different machines (for example compiled on P3 and running on Celeron)
</para>
<para>
Solution: compile <application>MPlayer</application> on the same machine
where you will use it!
</para>
<para>
Workaround: You can forget all this by configuring with the
<option>--enable-runtime-cpudetection</option> option or you can
disable particular CPU instruction sets with more specific options (like
<option>--disable-mmx</option>, <option>--disable-3dnow</option>, etc).
</para>
</listitem>
<listitem>
<para>Crashes when dumping streams:</para>
<para>Problem: core dump</para>
<para>Solution: Don't panic. Make sure you know where your towel is.</para>
</listitem>
</itemizedlist>
</sect1>
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<sect1 id="bugs-audio">
<title>Various A-V sync and other audio problems</title>
<sect2 id="bugs-delay-all">
<title>General audio delay or jerky sound
(exists with all or many files)</title>
<itemizedlist>
<listitem><para>
most common: buggy audio driver! - try to use different drivers, try ALSA OSS
emulation with <option>-ao oss</option>, also try <option>-ao sdl</option>,
sometimes it helps. If your file plays fine with <option>-nosound</option>,
then you can be sure it's sound card (driver) problem.
</para></listitem>
<listitem>
<para>audio buffer problems (buffer size badly detected)</para>
<para>
Workaround: <application>MPlayer</application>'s <option>-abs</option> option
</para>
</listitem>
<listitem><para>
samplerate problems - maybe your card doesn't support the samplerate used in
your files - try the resampling filter (<option>-af resample=...</option>)
</para></listitem>
<listitem>
<para>slow machine (CPU or VGA)</para>
<para>
try with <option>-vo null</option>, if it plays well, then you have slow
VGA card/driver
</para>
<para>
Workaround: buy a faster card or read this documentation about how to speed up
</para>
<para>Also try <option>-framedrop</option></para>
</listitem>
</itemizedlist>
</sect2>
<!-- ********** -->
<sect2 id="bugs-delay-specific">
<title>Audio delay/desync specific to one or a few files</title>
<itemizedlist>
<listitem>
<para>bad file</para>
<para>
Workaround:
<itemizedlist>
<listitem>
<para>
<option>-ni</option> or <option>-nobps</option> option
(for non-interleaved or bad files)
</para>
<para>and/or</para>
</listitem>
<listitem>
<para>
<option>-mc 0</option>
(required for files with badly interleaved VBR audio)
</para>
<para>and/or</para>
</listitem>
<listitem>
<para>
<option>-delay</option> or <keycap>+</keycap>/<keycap>-</keycap>
keys at runtime to adjust delay
</para>
</listitem>
</itemizedlist>
If none of these help, please upload the file, we'll check (and fix).
</para>
</listitem>
<listitem>
<para>your sound card doesn't support 48kHz playback</para>
<para>
Workaround: buy a better sound card... or try to decrease fps by 10%
(use <option>-fps 27</option> for a 30fps movie) or use the resample filter
</para>
</listitem>
<listitem>
<para>
slow machine (if A-V is not around 0,
and the last number in the status line increasing)
</para>
<para>Workaround: <option>-framedrop</option></para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
</appendix>
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