# HG changeset patch
# User Steve Borho <[email protected]>
# Date 1426555173 18000
# Mon Mar 16 20:19:33 2015 -0500
# Node ID c11e38ce9d8d55cfed8133a966c3ed58543d5721
# Parent ab10ce38456cd51ccf63e1934ae648fe3d407252
docs: document the current state of --limit-refs
diff -r ab10ce38456c -r c11e38ce9d8d doc/reST/cli.rst
--- a/doc/reST/cli.rst Mon Mar 16 20:19:33 2015 -0500
+++ b/doc/reST/cli.rst Mon Mar 16 20:19:33 2015 -0500
@@ -540,6 +540,31 @@
be consistent for all of them since the encoder configures several
key global data structures based on this range.
+.. option:: --limit-refs <0|1|2|3>
+
+ When set to X265_REF_LIMIT_DEPTH (1) x265 will limit the references
+ analyzed at the current depth based on the references used to code
+ the 4 sub-blocks at the next depth. For example, a 16x16 CU will
+ only use the references used to code its four 8x8 CUs.
+
+ When set to X265_REF_LIMIT_CU (2), the rectangular and asymmetrical
+ partitions will only use references selected by the 2Nx2N motion
+ search (including at the lowest depth which is otherwise unaffected
+ by the depth limit).
+
+ The two flags may be combined such that the 2Nx2N motion search at
+ each depth will only use references from the split CUs and then the
+ other motion searches at that depth will only use the reference(s)
+ selected by 2Nx2N. Combined they can reduce the number of motion
+ searches by as much as 80%.
+
+ You can often increase the number of references you are using
+ (within your decoder requirement level limits) if you enable one or
+ both of thes flags.
+
+ This feature is EXPERIMENTAL and currently only functional at RD
+ levels 5 and 6
+
.. option:: --rect, --no-rect
Enable analysis of rectangular motion partitions Nx2N and 2NxN
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