[FFmpeg-user] lutyuv filter clipping luma

Paul B Mahol onemda at gmail.com
Fri Jun 13 16:59:38 CEST 2014

On 6/13/14, Paulo Barretto <pmbarretto at gmail.com> wrote:
> 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.

That should be expected behavior for some pixel formats.
Only yuvJ and rgb ones are not having such behavior.

> Paulo Barretto
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