fix: Always respect the returned MIME type (#2473)

- Closes #2449

src/utils/mime-type.ts

@@ -0,0 +1,19 @@
+interface MimeTypeClassification {
+  isHLS: boolean;
+  isVideo: boolean;
+}
+
+/**
+ * Classifies a MIME type for player selection.
+ *
+ * RFC 6838 declares MIME types case-insensitive (e.g. Frigate emits
+ * `application/x-mpegURL`), so input is normalized before comparison.
+ */
+export const classifyMimeType = (mimeType?: string): MimeTypeClassification => {
+  const normalized = mimeType?.toLowerCase();
+  const isHLS =
+    normalized === 'application/vnd.apple.mpegurl' ||
+    normalized === 'application/x-mpegurl';
+  const isVideo = isHLS || !!normalized?.startsWith('video/');
+  return { isHLS, isVideo };
+};