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270 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<TITLE>Bug reporting - MPlayer - The Movie Player for Linux</TITLE>
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<BODY>
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<H1><A NAME="B">Appendix B - How to report bugs</A></H1>
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<P>Good bug reports are a very valuable contribution to the development of any
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software project. But just like writing good software, good problem reports
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involve some work. Please realize that most developers are extremely busy and
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receive obscene amounts of email. So while your feedback is crucial in
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improving <B>MPlayer</B> and very much appreciated, please understand that you
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have to provide <B>all</B> of the information we request and follow the
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instructions in this document closely.</P>
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<H2>How to fix bugs</H2>
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<P>If you feel have the necessary skills you are invited to have a go at fixing
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the bug yourself. Or maybe you already did that? Please read
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<A HREF="tech/patches.txt">this short document</A> to find out how to get
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your code included in <B>MPlayer</B>. The people on the
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<A HREF="http://mplayerhq.hu/mailman/listinfo/mplayer-dev-eng">mplayer-dev-eng</A>
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mailing list will assist you if you have questions.</P>
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<H2>How to report bugs</H2>
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<P>First of all please try the latest CVS version of <B>MPlayer</B> as your bug
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might already be fixed there. Development moves extremely fast, most problems
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in official releases are reported within days or even hours, so please use
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<B>only CVS</B> to report bugs. CVS instructions can be found at the bottom of
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<A HREF="http://www.mplayerhq.hu/homepage/dload.html">this page</A> or in the
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README. If this did not help please refer to
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<A HREF="documentation.html#known_bugs">the list of known bugs</A> and the
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rest of the documentation. If your problem is not known or not solvable by our
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instructions, then please report the bug.</P>
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<P>Please do not send bug reports privately to individual developers. This is
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community work and thus there might be several people interested in it.
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Sometimes other users already experienced your troubles and know how to
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circumvent a problem even if it is a bug in <B>MPlayer</B> code.</P>
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<P>Please describe your problem in as much detail as possible. Do a little
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detective work to narrow down the circumstances under which the problem
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occurs. Does the bug only show up in certain situations? Is it specific to
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certain files or file types? Does it occur with only one codec or is it codec
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independent? Can you reproduce it with all output drivers? The more
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information you provide the better are our chances at fixing your problem.
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Please do not forget to also include the valuable information requested below,
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we will be unable to properly diagnose your problem otherwise.</P>
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<P>An excellent and well written guide to asking questions in public forums is
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<A HREF="http://www.tuxedo.org/~esr/faqs/smart-questions.html">How To Ask
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Questions The Smart Way</A> by Eric S. Raymond. If you follow these guidelines
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you should be safe. But please understand that we all follow the mailing lists
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voluntarily in our free time. We are very busy and cannot guarantee that you
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will get a solution for your problem or even an answer.</P>
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<H3>Where to report bugs?</H3>
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<P>Subscribe to the mplayer-users mailing list:<BR>
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<A HREF="http://mplayerhq.hu/mailman/listinfo/mplayer-users">http://mplayerhq.hu/mailman/listinfo/mplayer-users</A><BR>
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and send your bug report to:<BR>
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<A HREF="mailto:mplayer-users@mplayerhq.hu">mplayer-users@mplayerhq.hu</A></P>
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<P>The language of this list is <B>English</B>. Please follow the standard
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<A HREF="http://www.ietf.org/rfc/rfc1855.txt">Netiquette Guidelines</A> and
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<B>do not send HTML mail</B> to any of our mailing lists. You will only get
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ignored or banned. If you do not know what HTML mail is or why it is evil,
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read this <A HREF="http://expita.com/nomime.html">fine document</A>. It
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explains all the details and has instructions for turning HTML off. Also note
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that we will not individually CC (carbon-copy) people so it is a good idea to
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subscribe to actually receive your answer.</P>
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<H3>What to report?</H3>
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<H4>System Information:</H4>
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<UL>
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<LI>Your Linux distribution or operating system e.g.:
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<UL>
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<LI>Red Hat 7.1</LI>
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<LI>Slackware 7.0 + devel packs from 7.1 ...</LI>
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</UL>
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</LI>
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<LI>kernel version:<BR>
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<CODE>uname -a</CODE></LI>
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<LI>libc version:<BR>
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<CODE>ls -l /lib/libc[.-]*</CODE></LI>
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<LI>X version:<BR>
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<CODE>X -version</CODE></LI>
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<LI>gcc and ld versions:<BR>
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<CODE>gcc -v<BR>
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ld -v</CODE></LI>
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<LI>binutils version:<BR>
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<CODE>as --version</CODE></LI>
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<LI>If you have problems with fullscreen mode:
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<UL>
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<LI>Window manager type and version</LI>
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</UL>
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</LI>
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<LI>If only the GUI is buggy:
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<UL>
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<LI>GTK version</LI>
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<LI>GLIB version</LI>
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<LI>libpng version</LI>
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<LI>GUI situation in which the bug occurs</LI>
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</UL>
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</LI>
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</UL>
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<H4>Hardware & drivers:</H4>
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<UL>
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<LI>CPU info (this works on Linux only):<BR>
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<CODE>cat /proc/cpuinfo</CODE></LI>
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<LI>Video card manufacturer and model, e.g.:
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<UL>
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<LI>ASUS V3800U chip: nVidia TNT2 Ultra pro 32MB SDRAM</LI>
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<LI>Matrox G400 DH 32MB SGRAM</LI>
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</UL>
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</LI>
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<LI>Video driver type & version, e.g.:
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<UL>
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<LI>X built-in driver</LI>
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<LI>nVidia 0.9.623</LI>
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<LI>Utah-GLX CVS 2001-02-17</LI>
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<LI>DRI from X 4.0.3</LI>
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</UL>
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</LI>
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<LI>Sound card type & driver, e.g.:
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<UL>
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<LI>Creative SBLive! Gold with OSS driver from oss.creative.com</LI>
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<LI>Creative SB16 with kernel OSS drivers</LI>
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<LI>GUS PnP with ALSA OSS emulation</LI>
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</UL>
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</LI>
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<LI>If in doubt include <CODE>lspci -vv</CODE> output on Linux systems.</LI>
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</UL>
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<H4>For compilation problems/errors</H4>
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Please include these files:
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<UL>
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<LI>configure.log</LI>
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<LI>config.h</LI>
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<LI>config.mak</LI>
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<LI>libvo/config.mak</LI>
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</UL>
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<H4>For playback problems</H4>
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<P>Please include the output of <B>MPlayer</B> at verbosity level 1, but
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remember to <B>not truncate the output</B> when you paste it into your mail.
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The developers need all of the messages to properly diagnose a problem. You
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can direct the output into a file like this:</P>
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<P><CODE> mplayer -v [options] [filename] &> mplayer.log</CODE></P>
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<P>If your problem is specific to one or more files, then please upload the
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offender(s) to:</P>
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<P> <A HREF="ftp://mplayerhq.hu/MPlayer/incoming/">ftp://mplayerhq.hu/MPlayer/incoming/</A></P>
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<P>Also upload a small text file having the same base name as your file
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with a .txt extension. Describe the problem you are having with the
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particular file there and include your email address as well as the output
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of <B>MPlayer</B> at verbosity level 1. Usually the first 1-5 MB of a file are
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enough to reproduce the problem, but to be sure we ask you to:</P>
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<P><CODE> dd if=yourfile of=smallfile bs=1024k count=5</CODE></P>
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<P>It will take the first five megabytes of <STRONG>'your-file'</STRONG> and
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write it to <STRONG>'small-file'</STRONG>. Then try again on this small file
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and if the bug still shows up your sample is sufficient for us. Please
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<STRONG>do not ever</STRONG> send such files via mail! Upload it, and send
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only the path/filename of the file on the FTP-server. If the file is
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accessible on the net, then sending the <STRONG>exact</STRONG> URL is
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sufficient.</P>
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<H4>For crashes</H4>
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<P>If you have a core dump of the crash continue reading the next paragraph,
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otherwise skip it.</P>
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<H4>How to extract meaningful information from a core dump</H4>
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<P>Please create the following command file:</P>
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<P><CODE>disass $eip-32 $eip+32<BR>
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printf "eax=%08lX\n",$eax<BR>
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printf "ebx=%08lX\n",$ebx<BR>
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printf "ecx=%08lX\n",$ecx<BR>
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printf "edx=%08lX\n",$edx<BR>
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printf "esp=%08lX\n",$esp<BR>
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printf "ebp=%08lX\n",$ebp<BR>
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printf "edi=%08lX\n",$edi<BR>
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printf "esi=%08lX\n",$esi</CODE></P>
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<P>Then simply execute the following on your command line:</P>
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<P> <CODE>gdb mplayer --core=core -batch --command=command_file > mplayer.bug</CODE></P>
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<H4>How to conserve information about a reproducible crash</H4>
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Recompile <B>MPlayer</B> with debugging code enabled:
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<P><CODE> ./configure --enable-debug=3<BR>
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make</CODE></P>
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and then run <B>MPlayer</B> within gdb using:
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<P><CODE> gdb mplayer</CODE></P>
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You are now within gdb. Type:
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<P><CODE> run -v [options-to-mplayer] filename</code></P>
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and reproduce your crash. As soon as you did it, gdb will
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return you to the command line prompt where you have to enter
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<P><CODE> bt<BR>
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disass $eip-32 $eip+32</CODE></P>
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and send the complete output to us.
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<H3>General note</H3>
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<P>If something is quite big (logs for instance) then it is better to upload
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it to the FTP server in a compressed format (gzip and bzip preferred) and
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include only the path and filename in your bug report.</P>
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<H2>I know what I am doing...</H2>
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<P>If you created a proper bug report following the steps above and you are
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confident it is a bug in <B>MPlayer</B>, not a compiler problem or broken
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file, you have already read the documentation and you could not find a
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solution, your sound drivers are OK, then you might want to subscribe to the
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mplayer-advusers list and send your bug report there to get a better and
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faster answer.<BR><BR>
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Please be advised that if you post newbie questions or questions answered
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in the manual there, you will be ignored or flamed instead of getting an
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appropriate answer.<BR>
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So do not flame us and subscribe to -advusers only if you really know
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what you are doing and feel like being an advanced <B>MPlayer</B> user or
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developer. If you meet these criteria it should not be difficult to find
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out how to subscribe...</P>
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