<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.12 $ -->
<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>&quot;Internal buffer inconsistency&quot; during <application>MEncoder</application> run:</para>
<para>Problem: known problem when lame &lt; 3.90 was compiled with gcc 2.96 or 3.x.</para>
<para>Solution: use lame &gt;=3.90.</para>
<para>Workaround: compile lame with gcc 2.95.x and remove any already installed
lame packages, they may have been compiled with gcc 2.96.</para>
</listitem>
<listitem>
<para>Messed up MP2/MP3 sound on PPC:</para>
<para>Problem: known GCC miscompilation bug on PPC platforms, no fix yet.</para>
<para>Workaround: use FFmpeg's (slow) MP1/MP2/MP3 decoder (<option>-ac ffmpeg</option>)</para>
</listitem>
<listitem>
<para>SIGSEGV (signal 11) in libmpeg2, when scaling+encoding:</para>
<para>Problem: known GCC 2.95.2 MMX bug</para>
<para>Solution: upgrade to 2.95.3</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 0.9 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>
</itemizedlist>
<itemizedlist>
<listitem>
<para>audio buffer problems (buffer size badly detected)</para>
<para>Workaround: <application>MPlayer</application>'s <option>-abs</option> option</para>
</listitem>
</itemizedlist>
<itemizedlist>
<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>
</itemizedlist>
<itemizedlist>
<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>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>Workaround: 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>
<listitem>
<para>
you try to play DivX 3.x file with OpenDivX decoder or XviD
(<option>-vc odivx</option>) - install DivX4Linux and recompile player
</para>
</listitem>
</itemizedlist>
</sect2>

<sect2 id="bugs-video">
<title>Video-out problems</title>
<para>
First note: options <option>-fs -vm</option> and <option>-zoom</option> are just
recommendations, not (yet) supported by all drivers. So it isn't a bug if it
doesn't work. Only a few driver supports scaling/zooming, don't expect this from
x11 or dga.
</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>
