On Sat, May 30, 2020 at 10:49 AM <amin...@gmail.com> wrote: > Hi all - what's the current state of running custom GLSL shaders for > effects and transitions in MLT? In 2017 it appears it wasn't supported, at > least using Movit. > > Specifically, I'd like to write shaders that take frames from multiple > producers as input. > > It is only possible for two inputs (transition) using WebGL with WebVfx. It includes an example based GL transitions <https://gl-transitions.com>: https://github.com/mltframework/webvfx/blob/master/demo/examples/transition-shader-glslio.html
Otherwise, as a single input filter, there is an add-on to FFmpeg libavfilter to use GLSL that you would need to extend to read from a specified file. The nice thing about WebVfx is that it already provides the framework to make MLT properties - including animated with keyframes - available to the shader uniforms by way of the JavaScript required to use WebGL. Otherwise, a pure MLT plugin would require something to define how properties map to uniforms.
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