diff --git a/examples/downloader/ffmpeg-example.ts b/examples/downloader/ffmpeg-example.ts
index d9aa250..79240a5 100644
--- a/examples/downloader/ffmpeg-example.ts
+++ b/examples/downloader/ffmpeg-example.ts
@@ -3,7 +3,7 @@ import cliProgress from 'cli-progress';
 import type { WriteStream } from 'node:fs';
 import { createWriteStream, unlink } from 'node:fs';
 import { Innertube, UniversalCache } from 'youtubei.js';
-import GoogleVideo, { type Format, Protos } from '../../dist/src/index.js';
+import GoogleVideo, { type Format } from '../../dist/src/index.js';
 
 const progressBars = new cliProgress.MultiBar({
   stopOnComplete: true,
@@ -121,8 +121,8 @@ await serverAbrStream.init({
   audioFormats: [ selectedAudioFormat ],
   videoFormats: [ selectedVideoFormat ],
   clientAbrState: {
-    mediaType: Protos.MediaType.MEDIA_TYPE_DEFAULT,
-    startTimeMs: 0
+    startTimeMs: 0,
+    mediaType: 0 // 0 = BOTH, 1 = AUDIO (video-only is no longer supported by YouTube)
   }
 });
 
diff --git a/examples/downloader/main.ts b/examples/downloader/main.ts
index f6564ec..75030f9 100644
--- a/examples/downloader/main.ts
+++ b/examples/downloader/main.ts
@@ -2,7 +2,7 @@ import cliProgress from 'cli-progress';
 import type { WriteStream } from 'node:fs';
 import { createWriteStream } from 'node:fs';
 import { Innertube, UniversalCache } from 'youtubei.js';
-import GoogleVideo, { type Format, Protos } from '../../dist/src/index.js';
+import GoogleVideo, { type Format } from '../../dist/src/index.js';
 
 const progressBars = new cliProgress.MultiBar({
   stopOnComplete: true,
@@ -130,13 +130,8 @@ await serverAbrStream.init({
   audioFormats: [ selectedAudioFormat ],
   videoFormats: [ selectedVideoFormat ],
   clientAbrState: {
-    /**
-     * MEDIA_TYPE_DEFAULT = 0,
-     * MEDIA_TYPE_AUDIO = 1,
-     * MEDIA_TYPE_VIDEO = 2,
-     */
-    mediaType: Protos.MediaType.MEDIA_TYPE_DEFAULT,
-    startTimeMs: 0
+    startTimeMs: 0,
+    mediaType: 0 // 0 = BOTH, 1 = AUDIO (video-only is no longer supported by YouTube)
   }
 });
 
diff --git a/src/core/ServerAbrStream.ts b/src/core/ServerAbrStream.ts
index 269e125..3aae649 100644
--- a/src/core/ServerAbrStream.ts
+++ b/src/core/ServerAbrStream.ts
@@ -97,12 +97,12 @@ export class ServerAbrStream extends EventEmitterLike {
         if (data.sabrError) break;
 
         const mainFormat =
-        clientAbrState.mediaType === ClientAbrState_MediaType.MEDIA_TYPE_DEFAULT
-          ? data.initializedFormats.find((fmt) => fmt.mimeType?.includes('video'))
-          : data.initializedFormats[0];
+          clientAbrState.mediaType === ClientAbrState_MediaType.MEDIA_TYPE_DEFAULT
+            ? data.initializedFormats.find((fmt) => fmt.mimeType?.includes('video'))
+            : data.initializedFormats[0];
 
         for (const fmt of data.initializedFormats) {
-          this.previousSequences.set(`${fmt.formatId.itag};${fmt.formatId.lastModified};`, fmt.sequenceList.map((seq) => seq.sequenceNumber || 0));
+          this.previousSequences.set(fmt.formatKey, fmt.sequenceList.map((seq) => seq.sequenceNumber || 0));
         }
 
         if (