On 2022-04-27 02:38 am, Leo Izen wrote:
Add more detailed documenation for the libjxl encoder
wrapper than is present currently inside libavcodec.
---
doc/encoders.texi | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/doc/encoders.texi b/doc/encoders.texi
index aac9f25e55..99399d4674 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -1809,6 +1809,40 @@ by ":". See the SVT-AV1 encoder user guide for a list of
accepted parameters.
@end table
+@section libjxl
+
+libjxl JPEG XL encoder wrapper.
+
+Requires the presence of the libjxl headers and library during
+configuration. You need to explicitly configure the build with
+@code{--enable-libjxl}.
+
+@subsection Options
+
+The libjxl wrapper supports the following options:
+
+@table @option
+
+@item distance
+Set the target Butteraugli distance. This is a quality setting: lower
+distance yields higher quality, with distance=1.0 roughly comparable to
+libjpeg Quality 90 for photographic content. Setting distance=0.0 yields
+true lossless encoding. Valid values range between 0.0 and 15.0, and sane
+values rarely exceed 5.0. Setting distance=0.1 is usually attains
+transparency for most input. The default is 1.0.
+
+@item effort
+Set the encoding effort used. Higher effort values produce more consistent
+quality and usually produces a better quality/bpp curve, at the cost of
+more CPU time required. Valid values range from 1 to 9, and the default is 7.
+
+@item modular
+Force the encoder to use Modular mode. The default is to let the encoder pick
+between VarDCT and Modular encoding modes based on encoding settings and the
+type of input content.
What happens in these two modes? Why would the user want to force
modular? Is there a way and reason to force VarDCT?
Regards,
Gyan
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