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docs: mention GST_DEBUG_OPTIONS, ORC_CODE, G_DEBUG and G_SLICE environment variables

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Mention a few more useful environment variables in the 'Running GStreamer
applications' section of the API reference.
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Tim-Philipp Müller 2010-09-02 12:44:08 +01:00
parent def17d30f4
commit 503e1faaea
1 changed files with 52 additions and 0 deletions
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docs/gst/running.xml
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@ -187,6 +187,20 @@ for the output to be compressed much better than with colours turned on.
</formalpara>
<formalpara id="GST_DEBUG_OPTIONS">
<title><envar>GST_DEBUG_OPTIONS</envar></title>
<para>
This environment variable can be used to tweak the behaviour of the debugging
system. Currently the only options supported are "pretty-tags" and "full-tags".
In "pretty-tags" mode (the default), taglists in the debug log will be
serialized so that only the first few and last few bytes of a buffer-type tag
will be serialized into the log, to avoid dumping hundreds of lines of useless
output into the log in case of large image tags and the like.
</para>
</formalpara>
<formalpara id="GST_DEBUG_DUMP_DOT_DIR">
<title><envar>GST_DEBUG_DUMP_DOT_DIR</envar></title>
@ -222,6 +236,44 @@ plugins frequently, it will save time when doing gst_init().
</formalpara>
<formalpara id="ORC_CODE">
<title><envar>ORC_CODE</envar></title>
<para>
Useful Orc environment variable. Set ORC_CODE=debug to enable debuggers
such as gdb to create useful backtraces from Orc-generated code. Set
ORC_CODE=backup or ORC_CODE=emulate if you suspect Orc's SIMD code
generator is producing incorrect code. (Quite a few important
GStreamer plugins like videotestsrc, audioconvert or audioresample use Orc).
</para>
</formalpara>
<formalpara id="G_DEBUG">
<title><envar>G_DEBUG</envar></title>
<para>
Useful GLib environment variable. Set G_DEBUG=fatal_warnings to make
GStreamer programs abort when a critical warning such as an assertion failure
occurs. This is useful if you want to find out which part of the code caused
that warning to be triggered and under what circumstances. Simply set G_DEBUG
as mentioned above and run the program in gdb (or let it core dump). Then get
a stack trace in the usual way.
</para>
</formalpara>
<formalpara id="G_SLICE">
<title><envar>G_SLICE</envar></title>
<para>
Useful GLib environment variable. Set G_SLICE=always-malloc when running
GStreamer programs in valgrind, or debugging memory leaks with other tools.
See the GLib API reference for more details.
</para>
</formalpara>
</refsect2>
</refsect1>