filmstrip-effects-filters/dev.jordond.filmstrip.effects.filters.vhs/Vhs

Vhs

class Vhs(val intensity: Float = 1.0f, val tape: TapeSpeed = TapeSpeed.EP, val seed: Int = DEFAULT_SEED) : EffectSpec(source)

Makes the frame look like it was played back from a VHS tape.

Softens luma and smears chroma along each line, wobbles the lines, bends the bottom of the frame like a head switch, and adds streaky noise, dropouts and the odd tracking band. The pattern is a function of the frame's composition time and its height as a fraction, so a seek or a smaller preview shows the same tape.

The effect runs over the fill and under any overlay at the same scope, so a caption added next to it stays clean. A clip overlay under a composition Vhs is part of the clip's frame by then, and is burned in with it.

An HDR source tone maps to SDR first. HdrMode.Auto reports that as a concession naming this effect, and HdrMode.KeepHdr is refused.

Register the renderer with filters() on the builder. Without it plan refuses the effect by name. An Apple device that cannot compile a Core Image Metal kernel, which takes an Apple6 GPU on iOS or on macOS 12, refuses it by name too.