refactor #3078

js/controllers/slidecontent.js

@@ -1,5 +1,4 @@
-import { HORIZONTAL_SLIDES_SELECTOR, VERTICAL_SLIDES_SELECTOR } from '../utils/constants.js'
+import { extend, queryAll, closest, getMimeTypeFromFile } from '../utils/util.js'
-import { extend, queryAll, closest } from '../utils/util.js'
 import { isMobile } from '../utils/device.js'
 
 import fitty from 'fitty';
@@ -137,7 +136,13 @@ export default class SlideContent {
 
 					// Support comma separated lists of video sources
 					backgroundVideo.split( ',' ).forEach( source => {
-						video.innerHTML += '<source src="'+ source +'" type="video/' + source.split(".").pop() + '">';
+						let type = getMimeTypeFromFile( source );
+						if( type ) {
+							video.innerHTML += `<source src="${source}" type="${type}">`;
+						}
+						else {
+							video.innerHTML += `<source src="${source}">`;
+						}
 					} );
 
 					backgroundContent.appendChild( video );

js/utils/util.js

@@ -280,3 +280,18 @@ export const getRemainingHeight = ( element, height = 0 ) => {
 	return height;
 
 }
+
+const fileExtensionToMimeMap = {
+	'mp4': 'video/mp4',
+	'm4a': 'video/mp4',
+	'ogv': 'video/ogg',
+	'mpeg': 'video/mpeg',
+	'webm': 'video/webm'
+}
+
+/**
+ * Guess the MIME type for common file formats.
+ */
+export const getMimeTypeFromFile = ( filename='' ) => {
+	return fileExtensionToMimeMap[filename.split('.').pop()]
+}