# HG changeset patch
# User Steve Borho <[email protected]>
# Date 1427386735 18000
# Thu Mar 26 11:18:55 2015 -0500
# Node ID a5d8c3dba996330eb222758f9811f7bedae49ecf
# Parent 9178c211a0feb1738b15133685a6103bdf471d86
docs: add documentation for --lookahead-slices
diff -r 9178c211a0fe -r a5d8c3dba996 doc/reST/cli.rst
--- a/doc/reST/cli.rst Thu Mar 26 11:06:57 2015 -0500
+++ b/doc/reST/cli.rst Thu Mar 26 11:18:55 2015 -0500
@@ -950,6 +950,24 @@
**Range of values:** Between the maximum consecutive bframe count
(:option:`--bframes`) and 250
+.. option:: --lookahead-slices <0..16>
+
+ Use multiple worker threads to measure the estimated cost of each
+ frame within the lookahead. When :option:`--b-adapt` is 2, most
+ frame cost estimates will be performed in batch mode, many cost
+ estimates at the same time, and lookahead-slices is ignored for
+ batched estimates. The effect on performance can be quite small.
+ The higher this parameter, the less accurate the frame costs will be
+ (since context is lost across slice boundaries) which will result in
+ less accurate B-frame and scene-cut decisions.
+
+ The encoder may internally lower the number of slices to ensure
+ each slice codes at least 10 16x16 rows of lowres blocks. If slices
+ are used in lookahead, the are logged in the list of tools as
+ *lslices*.
+
+ **Values:** 0 - disabled (default). 1 is the same as 0. Max 16
+
.. option:: --b-adapt <integer>
Adaptive B frame scheduling. Default 2
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