Possible address trac issue:
http://trac.ffmpeg.org/ticket/10763
---
doc/utils.texi | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/doc/utils.texi b/doc/utils.texi
index 76e704fc3c..edf3ae24b0 100644
--- a/doc/utils.texi
+++ b/doc/utils.texi
@@ -944,11 +944,23 @@ Return a pseudo random value between 0.0 and 1.0.
@var{idx} is the
index of the internal variable which will be used to save the
seed/state.
+To initialize the seed, you need to store the seed value as a 64-bit
+unsigned integer in the internal variable with index @var{idx}.
+
+For example, to store the value @code{42} in the internal
+variable with index @code{1} and print a few random values:
+@example
+st(0,42); print(random(0)); print(random(0)); print(random(0))
+@end example
+
@item randomi(idx, min, max)
Return a pseudo random value in the interval between @var{min} and
@var{max}. @var{idx} is the index of the internal variable which will
be used to save the seed/state.
+To initialize the seed, you need to store the seed value as a 64-bit
+unsigned integer in the internal variable with index @var{idx}.
+
@item root(expr, max)
Find an input value for which the function represented by @var{expr}
with argument @var{ld(0)} is 0 in the interval 0..@var{max}.
--
2.34.1
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