Implement settb filter.

Originally committed as revision 25445 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 30 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index e4c1851a05..3fadd9a1d2 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -428,6 +428,36 @@ ratio of the input image.
 
 The default value of @var{width} and @var{height} is 0.
 
+@section settb
+
+Set the timebase to use for the output frames timestamps.
+It is mainly useful for testing timebase configuration.
+
+It accepts in input an arithmetic expression representing a rational.
+The expression can contain the constants "PI", "E", "PHI", "AVTB" (the
+default timebase), and "intb" (the input timebase).
+
+The default value for the input is "intb".
+
+Follow some examples.
+
+@example
+# set the timebase to 1/25
+settb=1/25
+
+# set the timebase to 1/10
+settb=0.1
+
+#set the timebase to 1001/1000
+settb=1+0.001
+
+#set the timebase to 2*intb
+settb=2*intb
+
+#set the default timebase value
+settb=AVTB
+@end example
+
 @section slicify
 
 Pass the images of input video on to next video filter as multiple