diff options
| author | Paul B Mahol <onemda@gmail.com> | 2013-09-18 23:57:55 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-01-14 18:46:38 +0100 |
| commit | baea14d86021d04901171ff2430da3f93898636b (patch) | |
| tree | cd01036a2f55d9628a282ffa9aa91fdc017cd64b /doc | |
| parent | c4f1abecb15e8d82ee1f6b776bc3bbfe94bb19d8 (diff) | |
| download | ffmpeg-baea14d86021d04901171ff2430da3f93898636b.tar.gz | |
avfilter: port qp filter from libmpcodecs
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 42f69eaacb..154508cfff 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -7351,6 +7351,38 @@ telecine NTSC input: ffmpeg -i input -vf pullup -r 24000/1001 ... @end example +@section qp + +Change video quantization parameters (QP). + +The filter accepts the following option: + +@table @option +@item qp +Set expression for quantization parameter. +@end table + +The expression is evaluated through the eval API and can contain, among others, +the following constants: + +@table @var +@item known +1 if index is not 129, 0 otherwise. + +@item qp +Sequentional index starting from -129 to 128. +@end table + +@subsection Examples + +@itemize +@item +Some equation like: +@example +qp=2+2*sin(PI*qp) +@end example +@end itemize + @section removelogo Suppress a TV station logo, using an image file to determine which |