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| -rw-r--r-- | DOCS/xml/en/mencoder.xml | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/DOCS/xml/en/mencoder.xml b/DOCS/xml/en/mencoder.xml index b277ac9d6f..2a058cf248 100644 --- a/DOCS/xml/en/mencoder.xml +++ b/DOCS/xml/en/mencoder.xml @@ -2263,6 +2263,38 @@ Note the <option>ilmv</option> and <option>ildct</option> options. </para></listitem> <listitem><para> + <emphasis role="bold">me</emphasis>: + This option is for choosing the motion estimation search method. + Altering this option provides a straightforward quality-vs-speed + tradeoff. <option>me=1</option> is only a few percent faster than + the default search, at a cost of under 0.1dB global PSNR. The + default setting (<option>me=2</option>) is a reasonable tradeoff + between speed and quality. <option>me=3</option> gains a little under + 0.1dB global PSNR, with a speed penalty that varies depending on + <option>frameref</option>. At high values of + <option>frameref</option> (e.g. 12 or so), <option>me=3</option> + is about 40% slower than the default <option> me=2</option>. With + <option>frameref=3</option>, the speed penalty incurred drops to + 25%-30%. +</para> +<para> + <option>me=4</option> uses an exhaustive search that is too slow for + practical use. +</para> +</listitem> + +<listitem><para> + <emphasis role="bold">4x4mv</emphasis>: + This option enables the use of 8x4, 4x8 and 4x4 subpartitions in + predicted macroblocks. Enabling it results in a fairly consistent + 10%-15% loss of speed. This option is rather useless in source + containing only low motion, however in some high-motion source, + particularly source with lots of small moving objects, gains of + about 0.1dB can be expected. +</para> +</listitem> + +<listitem><para> <emphasis role="bold">bframes</emphasis>: The usefulness of B-frames is questionable in most other codecs you may be used to. |