add mp4 encoder

package-lock.json

@@ -6957,6 +6957,11 @@
       "dev": true,
       "optional": true
     },
+    "h264-mp4-encoder": {
+      "version": "1.0.12",
+      "resolved": "https://registry.npmjs.org/h264-mp4-encoder/-/h264-mp4-encoder-1.0.12.tgz",
+      "integrity": "sha512-xih3J+Go0o1RqGjhOt6TwXLWWGqLONRPyS8yoMu/RoS/S8WyEv4HuHp1KBsDDl8srZQ3gw9f95JYkCSjCuZbHQ=="
+    },
     "har-schema": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",

package.json

@@ -135,6 +135,7 @@
     "compression": "^1.7.4",
     "cors": "^2.8.5",
     "express": "^4.17.1",
+    "h264-mp4-encoder": "^1.0.12",
     "immer": "^7.0.9",
     "immutable": "^3.8.2",
     "node-fetch": "^2.6.0",