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author | gpoirier <gpoirier@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2005-07-05 22:11:23 +0000 |
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committer | gpoirier <gpoirier@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2005-07-05 22:11:23 +0000 |
commit | 2aa6a032516c9deeecf149a8c2c8b31b0b741494 (patch) | |
tree | c522c509458347be6cec0eac3e9ca9133e6f56fd /DOCS/xml/en | |
parent | 7bde74f07fbaef764773e88c1230bf6f1f93fbca (diff) | |
download | mpv-2aa6a032516c9deeecf149a8c2c8b31b0b741494.tar.bz2 mpv-2aa6a032516c9deeecf149a8c2c8b31b0b741494.tar.xz |
More options documented in XviD encoding guide
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15924 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'DOCS/xml/en')
-rw-r--r-- | DOCS/xml/en/mencoder.xml | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/DOCS/xml/en/mencoder.xml b/DOCS/xml/en/mencoder.xml index cb4fc7794e..bd6c2d5535 100644 --- a/DOCS/xml/en/mencoder.xml +++ b/DOCS/xml/en/mencoder.xml @@ -2710,6 +2710,57 @@ codec</title> If you are looking for speed, you should disable this option before starting to consider reducing <option>me_quality</option>. </para></listitem> + +<listitem><para> + <emphasis role="bold">chroma_opt</emphasis> + Is intended to increase chroma image quality around pure + white/black edges, rather than improving compression. + This can help to reduce the "red stairs" effect. +</para></listitem> + +<listitem><para> + <emphasis role="bold">lumi_mask</emphasis> + Tries to give less bitrate to part of the picture that the + human eye cannot see very well, which should allow the encoder + to spend the saved bits on more important parts of the picture. + The quality of the encode yielded by this option highly depends + on personal preferences and on the type and monitor settings + used to watch it (typically, it will not look as good if it is + bright or if it is a TFT monitor. +</para></listitem> + +<listitem><para> + <emphasis role="bold">qpel</emphasis> + Increases the precision of the motion estimation from halfpel to + quarterpel. + The idea is to find better motion vectors which will in return + reduce bitrate (hence increasing quality). + However, quarterpel precision motion vectors are coded in the + bitstream with a few bits, so if the content do not feature + enough possibilities to find better motion vectors through + <option>qpel</option>, it will in fact hurt compressibility. + Unfortunately, there is no way to foresee the possible gains of + <option>qpel</option>, so you need to actually encode with and + without it to know for sure. + </para><para> + <option>qpel</option> can be almost double encoding time, and + requires as much as 30-60% more processing power to decode. + It is not supported by all standalone players. +</para></listitem> + +<listitem><para> + <emphasis role="bold">gmc</emphasis> + Tries to save bits on panning scenes by using a single motion + vector for the whole frame. + This almost always raise PSNR, but significant slows down + encoding (and also needs more processing power to decode). + Therefore, you should only use it when you have turned + <option>vhq</option> to the maximum. + <systemitem class="library">XviD</systemitem>'s GMC (which are + more sophisticated than DivX's are not supported by all + standalone players. +</para></listitem> + </itemizedlist> </sect2> </sect1> |