[FFmpeg-devel] [PATCH] doc/encoders: document libtheora encoder

Stefano Sabatini stefasab at gmail.com
Sun Nov 11 12:41:15 CET 2012

 doc/encoders.texi |   40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index a7a2761..121d07b 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -420,6 +420,46 @@ Selected by Encoder (default)
 A description of some of the currently available video encoders
+ at section libtheora
+Theora format supported through libtheora.
+Requires the presence of the libtheora headers and library during
+configuration.  You need to explicitly configure the build with
+ at code{--enable-libtheora}.
+ at subsection Options
+The following options are mapped to internal libtheora options which
+affect the quality and the bitrate of the encoded stream. All the
+other global options are ignored.
+ at table @option
+ at item b
+Set the video bitrate, only works if the @code{qscale} flag in
+ at option{flags} is not enabled.
+ at item flags
+Used to enable constant quality mode encoding through the
+ at option{qscale} flag, and to enable the @code{pass1} and @code{pass2}
+modes. All the other values are ignored.
+ at item g
+Set the GOP size.
+ at item global_quality
+Set the global quality in lambda units, only works if the
+ at code{qscale} flag in @option{flags} is enabled. The value is clipped
+in the [0 - 10*@code{FF_QP2LAMBDA}] range, and then multiplied for 6.3
+to get a value in the native libtheora range [0-63].
+For example, to set maximum constant quality encoding with
+ at command{ffmpeg}:
+ at example
+ffmpeg -i INPUT -flags qscale -global_quality "10*QP2LAMBDA" -codec:v libtheora OUTPUT.ogg
+ at end example
+ at end table
 @section libvpx
 VP8 format supported through libvpx.

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