Merge pull request #4728 from MBR-0001/subtitle-improvements-2

Add ability to upload hearing-impaired subs

src/utils/file.ts

@@ -0,0 +1,15 @@
+/**
+ * Reads and returns the file encoded in base64
+ */
+export function readFileAsBase64(file: File): Promise<string> {
+    return new Promise(function (resolve, reject) {
+        const reader = new FileReader();
+        reader.onload = (e) => {
+            // Split by a comma to remove the url: prefix
+            const data = (e.target?.result as string)?.split?.(',')[1];
+            resolve(data);
+        };
+        reader.onerror = reject;
+        reader.readAsDataURL(file);
+    });
+}