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submodule
ffmpeg
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9d2a7c04
Commit
9d2a7c04
authored
Nov 11, 2012
by
Stefano Sabatini
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doc/encoders: document libtheora encoder
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doc/encoders.texi
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9d2a7c04
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@@ -420,6 +420,45 @@ Selected by Encoder (default)
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@@ -420,6 +420,45 @@ Selected by Encoder (default)
A description of some of the currently available video encoders
A description of some of the currently available video encoders
follows.
follows.
@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
@code{--enable-libtheora}.
@subsection Options
The following global options are mapped to internal libtheora options
which affect the quality and the bitrate of the encoded stream.
@table @option
@item b
Set the video bitrate, only works if the @code{qscale} flag in
@option{flags} is not enabled.
@item flags
Used to enable constant quality mode encoding through the
@option{qscale} flag, and to enable the @code{pass1} and @code{pass2}
modes.
@item g
Set the GOP size.
@item global_quality
Set the global quality in lambda units, only works if the
@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
@command{ffmpeg}:
@example
ffmpeg -i INPUT -flags:v qscale -global_quality:v "10*QP2LAMBDA" -codec:v libtheora OUTPUT.ogg
@end example
@end table
@section libvpx
@section libvpx
VP8 format supported through libvpx.
VP8 format supported through libvpx.
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