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<appendix id="bugs">
<title>Known bugs</title>


<sect1 id="bugs-special">
<title>Special system/CPU-specific bugs/problems</title>
<itemizedlist>
<listitem>
<para>SIGILL (signal 4) on P3 using 2.2.x kernels:</para>
<para>Problem: kernel 2.2.x doesn't have proper (working) SSE support</para>
<para>Solution: upgrade kernel to 2.4.x</para>
<para>Workaround: <command>./configure --disable-sse</command></para>
</listitem>

<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/de-sync 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>


<sect2 id="bugs-nosound">
<title>No sound at all</title>
<itemizedlist>
<listitem>
<para>your file uses an unsupported audio codec</para>
<para>Solution: read the documentation and help us adding support for it</para>
</listitem>
</itemizedlist>
</sect2>


<sect2 id="bugs-nopicture">
<title>No picture at all (just plain grey/green window)</title>
<itemizedlist>
<listitem>
<para>your file uses an unsupported video codec</para>
<para>Solution: read the documentation and help us adding support for it</para>
</listitem>

<listitem>
<para>
auto-selected codec can't decode the file, try to select another using
<option>-vc</option> or <option>-vfm</option> options
</para>
</listitem>
</itemizedlist>
</sect2>


<sect2 id="bugs-video">
<title>Video-out problems</title>
<para>
First note that the options <option>-fs</option>, <option>-vm</option> and
<option>-zoom</option> are not supported by all drivers. Plus, not all
drivers support scaling/zooming in hardware.
</para>

<formalpara>
<title>OSD/sub flickering</title>
<para>
<itemizedlist>
<listitem><para>x11 driver: sorry, it can't be fixed now</para></listitem>
<listitem><para>xv driver: use <option>-double</option> option</para></listitem>
</itemizedlist>
</para>
</formalpara>

<formalpara>
<title>Green image using mga_vid (<option>-vo mga</option> / <option>-vo xmga</option>)</title>
<para>
<itemizedlist>
<listitem><para>mga_vid misdetected your card's RAM amount, reload it using
<option>mga_ram_size</option> option
</para></listitem>
</itemizedlist>
</para>
</formalpara>

</sect2>
</sect1>

</appendix>
