[FFmpeg-user] lutyuv filter clipping luma

[Paulo Barretto]

lutyuv filter documentation says:

The expressions can contain the following constants and functions:
> ‘val’
> The input value for the pixel component.
> ‘clipval’
> The input value, clipped to the minval-maxval range.


I have found out that luma is being clipped regardless of the value I use.
In other words, the outputs of:

lutyuv=y=val
lutyuv=y=clipval

are exactly the same, clipped.

This can be easily seen with histogram filter, or playing the original and
filtered videos side by side.

Paulo Barretto