Force videos to be set dimensions.

web/react/utils/constants.jsx

@@ -72,6 +72,10 @@ module.exports = {
     MAX_FILE_SIZE: 50000000, // 50 MB
     THUMBNAIL_WIDTH: 128,
     THUMBNAIL_HEIGHT: 100,
+    WEB_VIDEO_WIDTH: 640,
+    WEB_VIDEO_HEIGHT: 480,
+    MOBILE_VIDEO_WIDTH: 480,
+    MOBILE_VIDEO_HEIGHT: 360,
     DEFAULT_CHANNEL: 'town-square',
     OFFTOPIC_CHANNEL: 'off-topic',
     GITLAB_SERVICE: 'gitlab',