https://bugs.kde.org/show_bug.cgi?id=359160
--- Comment #3 from wegwerf-1-...@gmx.de --- Jesse, it does make sense. However, the catch is in the handling of the alpha layer: ideally, this should be a MIN(a,b) handling when compositing one clip with alpha layer onto another clip also with alpha layer. Unfortunately, MLT doesn't support MIN, MAX, etc. but instead only AND, OR, XOR. Now boolean operators only work for alpha when there are exactly two alpha levels in use, namely 0 and 255. For gradual alpha, as it is often used to achieve smooth blending, AND is not substitute for MIN. The only way around this is to *not cascade* composition of multiple tracks, one after another, but instead to all them composite only with the final, bottommost layer. Only then alpha AND handling doesn't cause any problems. MLT should support at least the MIN operator for alpha layer compositing... -- You are receiving this mail because: You are watching all bug changes.
