I was wondering, what kind of interpolation kdenlive is using when effects like rotation or zoom are employed ?
I ask that because the result of these effects seems very blurry, like the result of a bilinear filter. And when I extract one frame of my video and rotate it using a bicubic filter, the result is way more sharp. It makes a great difference between sequence with and without rotation or zoom (very visible to the naked eye and no need to press stop and examine the frame).
So if kdenlive uses the bilinear filtering, is it possible to implement something like bicubic or lanczos ?