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| author | Stefano Sabatini <stefasab@gmail.com> | 2024-01-01 20:38:03 +0100 |
|---|---|---|
| committer | Stefano Sabatini <stefasab@gmail.com> | 2024-04-15 18:30:35 +0200 |
| commit | 8ceb37d5ad730b93e4a277b74a5279c5d1f7864a (patch) | |
| tree | 64fc81443acb2692711d506e8164ee50da4a0777 /doc | |
| parent | 993c231de0b1a7574c0951959314bb692646b93e (diff) | |
| download | ffmpeg-8ceb37d5ad730b93e4a277b74a5279c5d1f7864a.tar.gz | |
doc/utils/eval: clarify meaning of random* seed value
Possible address trac issue:
http://trac.ffmpeg.org/ticket/10763
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/utils.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/utils.texi b/doc/utils.texi index 76e704fc3c..2f18a61bfd 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 seed with value @code{42} in the internal +variable with index @code{0} 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}. |