lavfi: USPP Filter

Previous version reviewed by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 25 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 0ea39559d8..910f12fba9 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8935,6 +8935,31 @@ unsharp=7:7:-2:7:7:-2
 @end example
 @end itemize
 
+@section uspp
+
+Apply ultra slow/simple postprocessing filter that compresses and decompresses
+the image at several (or - in the case of @option{quality} level @code{8} - all)
+shifts and average the results.
+
+The way this differs from the behavior of spp is that uspp actually encodes &
+decodes each case with libavcodec Snow, whereas spp uses a simplified intra only 8x8
+DCT similar to MJPEG.
+
+The filter accepts the following options:
+
+@table @option
+@item quality
+Set quality. This option defines the number of levels for averaging. It accepts
+an integer in the range 0-8. If set to @code{0}, the filter will have no
+effect. A value of @code{8} means the higher quality. For each increment of
+that value the speed drops by a factor of approximately 2.  Default value is
+@code{3}.
+
+@item qp
+Force a constant quantization parameter. If not set, the filter will use the QP
+from the video stream (if available).
+@end table
+
 @anchor{vidstabdetect}
 @section vidstabdetect