Feature request: Save snapshot button

[dbuezas]

Parts of this snippet may be handy
https://gist.github.com/lukejacksonn/a5dd4bb03dc8dad3d489379fd5d26339

[AlexxIT]

VideoRTC has similar code

WebRTC/custom_components/webrtc/www/video-rtc.js

Lines 581 to 611 in 359e3ec

	onmp4() {
	/** @type {HTMLCanvasElement} **/
	const canvas = document.createElement('canvas');
	/** @type {CanvasRenderingContext2D} */
	let context;
	/** @type {HTMLVideoElement} */
	const video2 = document.createElement('video');
	video2.autoplay = true;
	video2.playsInline = true;
	video2.muted = true;
	video2.addEventListener('loadeddata', () => {
	if (!context) {
	canvas.width = video2.videoWidth;
	canvas.height = video2.videoHeight;
	context = canvas.getContext('2d');
	}
	context.drawImage(video2, 0, 0, canvas.width, canvas.height);
	this.video.controls = false;
	this.video.poster = canvas.toDataURL('image/jpeg');
	});
	this.ondata = data => {
	video2.src = 'data:video/mp4;base64,' + VideoRTC.btoa(data);
	};
	this.send({type: 'mp4', value: this.codecs('mp4')});
	}

[AlexxIT]

https://github.com/AlexxIT/WebRTC/releases/tag/v3.3.0