[FFmpeg-devel] [PATCH 1/2] doc/utils/eval: clarify meaning of random* seed value

[FFmpeg-devel] [PATCH 1/2] doc/utils/eval: clarify meaning of random* seed value

[Stefano Sabatini]

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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Re: [FFmpeg-devel] [PATCH 1/2] doc/utils/eval: clarify meaning of random* seed value

[Michael Niedermayer]

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On Wed, Apr 10, 2024 at 03:47:42PM +0200, Stefano Sabatini wrote:
> Possible address trac issue:

> http://trac.ffmpeg.org/ticket/10763

Some of the things in this ticket are specific to the buggy LCG
we no longer use


> ---
>  doc/utils.texi | 12 ++++++++++++
>  1 file changed, 12 insertions(+)

sounds ok

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If you fake or manipulate statistics in a paper in physics you will never
get a job again.
If you fake or manipulate statistics in a paper in medicin you will get
a job for life at the pharma industry.

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Re: [FFmpeg-devel] [PATCH 1/2] doc/utils/eval: clarify meaning of random* seed value

[Stefano Sabatini]

On date Thursday 2024-04-11 03:50:46 +0200, Michael Niedermayer wrote:
> On Wed, Apr 10, 2024 at 03:47:42PM +0200, Stefano Sabatini wrote:
> > Possible address trac issue:
> 
> > http://trac.ffmpeg.org/ticket/10763
> 
> Some of the things in this ticket are specific to the buggy LCG
> we no longer use
> 
> 
> > ---
> >  doc/utils.texi | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> 
> sounds ok
> 
> thx

Applied, thanks.
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