Javascript library for processing chromakey video in browser

Installation

NPM

npm install ckv

Usage

ES6 modules

import CKV from ckv;

CommonJS

const CKV = require('ckv');

Example

import CKV from ckv;

const ckVideo = new CKV('.selector-where-show', 'path/to/video.mp4', {filter: 'Green', loop: true, mute: true});
ckVideo.play().then(() => 'do something');

API

CKV(selector: string, url: string, options?: ICKVOptions)

• selector - HTMLElement where the filtered video will be displayed
• url - path to video
• options(optional):

interface ICKVOptions {
    loop?: boolean; // playback loop. Default: false
    mute?: boolean; // playback mute. Default: false
    showOriginalIn?: string; // selector where to show the original video. Default: null
    filter?: string; // supports: ['Green']. Default: 'Green'
}

Methods

interface ICKV {
    play(): Promise<void>;
    stop(): void;
    newVideo(url: string, options?: ICKVOptions): void;
    setVolume(num: number): void;
    seek(num: number): void;
    destroy(): void;
}

.play(): Promise

Starts playback

.stop(): void

Stop playback

.newVideo(url: string, options?: ICKVOptions): void

Installing a new video. Need to run again

.setVolume(num: number): void

num - range [0, 1]. Required option mute: false

.seek(num: number): void

num - range [0, 1]. Video rewind

.destroy(): void

Removes all event listeners and elements

const ckVideo = new CKV('.selector-where-show', 'path/to/video.mp4', {
    filter: 'Green',
    loop: true,
    mute: true,
});
ckVideo.destroy();
ckVideo = null;

Browser support

| Chrome | Safari | Edge | Firefox | Opera | | ------ | ------ | ---- | ------- | ----- | | 33+ | 7.1+ | 12+ | 29+ | 20+ |

How does it work

Uses 2d context(CPU)(temporarily). Up to 2,073,600 (1920 * 1080) pixels are processed in the main thread. If more, then it breaks into cycles of 1,036,800.

To do:

• Shader processing(GPU)
• adding custom filters

License

MIT License