diff --git a/src/components/live/providers/go2rtc/video-rtc.js b/src/components/live/providers/go2rtc/video-rtc.js
index 59b6aa3e..0e80f76f 100644
--- a/src/components/live/providers/go2rtc/video-rtc.js
+++ b/src/components/live/providers/go2rtc/video-rtc.js
@@ -937,7 +937,10 @@ export class VideoRTC extends HTMLElement {
       video2.src = 'data:video/mp4;base64,' + VideoRTC.btoa(data);
     };
 
-    this.send({ type: 'mp4', value: this.codecs(this.video.canPlayType) });
+    this.send({
+      type: 'mp4',
+      value: this.codecs((type) => this.video.canPlayType(type)),
+    });
   }
 
   static btoa(buffer) {
diff --git a/tests/components/live/providers/go2rtc.browser.test.ts b/tests/components/live/providers/go2rtc.browser.test.ts
index fb8c0d1a..66e2d962 100644
--- a/tests/components/live/providers/go2rtc.browser.test.ts
+++ b/tests/components/live/providers/go2rtc.browser.test.ts
@@ -1,4 +1,5 @@
 import { describe, expect, it } from 'vitest';
+import { mock } from 'vitest-mock-extended';
 
 import type { VideoRTC } from '../../../../src/components/live/providers/go2rtc/video-rtc';
 import type { RawAdvancedCameraCardConfig } from '../../../../src/config/types';
@@ -29,4 +30,25 @@ describe('AdvancedCameraCardGo2RTC', () => {
     const player = await card.waitForSelector<VideoRTC>(PLAYER_SELECTOR);
     expect(player.wsURL).toBe('ws://localhost:1984/api/ws?src=office');
   });
+
+  it('should start the modes that follow mp4', async () => {
+    // See: https://github.com/dermotduffy/advanced-camera-card/issues/2721
+
+    const card = await mount({
+      go2rtc: {
+        url: 'http://localhost:1984',
+        stream: 'office',
+        modes: ['mp4', 'webrtc'],
+      },
+      proxy: { live: false },
+    });
+
+    const player = await card.waitForSelector<VideoRTC>(PLAYER_SELECTOR);
+
+    const ws = mock<WebSocket>();
+    player.ws = ws;
+
+    expect(player.onopen()).toEqual(['mp4', 'webrtc']);
+    expect(ws.send).toHaveBeenCalledWith(expect.stringContaining('"type":"mp4"'));
+  });
 });