lavc, doc, configure: add libxavs2 video encoder wrapper

Signed-off-by: hwren <hwrenx@126.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 7b095754d1..4623f38969 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -2726,6 +2726,55 @@ Reduces detail but attempts to preserve color at extremely low bitrates.
 
 @end table
 
+@section libxavs2
+
+xavs2 AVS2-P2/IEEE1857.4 encoder wrapper.
+
+This encoder requires the presence of the libxavs2 headers and library
+during configuration. You need to explicitly configure the build with
+@option{--enable-libxavs2}.
+
+@subsection Options
+
+@table @option
+@item lcu_row_threads
+Set the number of parallel threads for rows from 1 to 8 (default 5).
+
+@item initial_qp
+Set the xavs2 quantization parameter from 1 to 63 (default 34). This is
+used to set the initial qp for the first frame.
+
+@item qp
+Set the xavs2 quantization parameter from 1 to 63 (default 34). This is
+used to set the qp value under constant-QP mode.
+
+@item max_qp
+Set the max qp for rate control from 1 to 63 (default 55).
+
+@item min_qp
+Set the min qp for rate control from 1 to 63 (default 20).
+
+@item speed_level
+Set the Speed level from 0 to 9 (default 0). Higher is better but slower.
+
+@item log_level
+Set the log level from -1 to 3 (default 0). -1: none, 0: error,
+1: warning, 2: info, 3: debug.
+
+@item hierarchical_ref
+Set the hierarchical reference or not (default true).
+
+@item xavs2-params
+Set xavs2 options using a list of @var{key}=@var{value} couples separated
+by ":".
+
+For example to specify libxavs2 encoding options with @option{-xavs2-params}:
+
+@example
+ffmpeg -i input -c:v libxavs2 -xavs2-params preset_level=5 output.avs2
+@end example
+@end table
+
 @c man end VIDEO ENCODERS
 
 @chapter Subtitles Encoders