Fix assertion failure

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "mediabunny",
-  "version": "1.32.0",
+  "version": "1.32.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mediabunny",
-      "version": "1.32.0",
+      "version": "1.32.2",
       "license": "MPL-2.0",
       "workspaces": [
         "packages/*"
@@ -7739,9 +7739,9 @@
       }
     },
     "node_modules/mediabunny": {
-      "version": "1.31.1",
-      "resolved": "https://registry.npmjs.org/mediabunny/-/mediabunny-1.31.1.tgz",
-      "integrity": "sha512-7ijrySW675UTxXoAji8Xj/H8H1uyZhPDARlNO1FF1zGnzJV3snayU32c1bpumslx5vbUa/M7fm6kcG/3y7UxHQ==",
+      "version": "1.32.1",
+      "resolved": "https://registry.npmjs.org/mediabunny/-/mediabunny-1.32.1.tgz",
+      "integrity": "sha512-pPxhBEIY7dNEhRarN/DTVL56RTce0iCwNwkhu/at+S9S/HKc01PpHs8oM2I+1I9ztQH/bo2zdyszxDuAwsEBAg==",
       "license": "MPL-2.0",
       "peer": true,
       "workspaces": [
@@ -12065,7 +12065,7 @@
     },
     "packages/mp3-encoder": {
       "name": "@mediabunny/mp3-encoder",
-      "version": "1.32.0",
+      "version": "1.32.2",
       "license": "MPL-2.0",
       "devDependencies": {
         "@types/emscripten": "^1.40.1"

package.json

@@ -1,7 +1,7 @@
 {
   "name": "mediabunny",
   "author": "Vanilagy",
-  "version": "1.32.0",
+  "version": "1.32.2",
   "description": "Pure TypeScript media toolkit for reading, writing, and converting media files, directly in the browser.",
   "type": "module",
   "workspaces": [

packages/mp3-encoder/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@mediabunny/mp3-encoder",
   "author": "Vanilagy",
-  "version": "1.32.0",
+  "version": "1.32.2",
   "description": "MP3 encoder extension for Mediabunny, based on LAME.",
   "main": "./dist/bundles/mediabunny-mp3-encoder.mjs",
   "module": "./dist/bundles/mediabunny-mp3-encoder.mjs",

src/wave/wave-demuxer.ts

@@ -425,6 +425,8 @@ class WaveAudioTrackBacking implements InputAudioTrackBacking {
 		packetIndex: number,
 		options: PacketRetrievalOptions,
 	): Promise<EncodedPacket | null> {
+		assert(packetIndex >= 0);
+
 		assert(this.demuxer.audioInfo);
 		const startOffset = packetIndex * PACKET_SIZE_IN_FRAMES * this.demuxer.audioInfo.blockSizeInBytes;
 		if (startOffset >= this.demuxer.dataSize) {
@@ -465,7 +467,7 @@ class WaveAudioTrackBacking implements InputAudioTrackBacking {
 
 		this.demuxer.lastKnownPacketIndex = Math.max(
 			packetIndex,
-			timestamp,
+			this.demuxer.lastKnownPacketIndex,
 		);
 
 		return new EncodedPacket(
@@ -489,6 +491,9 @@ class WaveAudioTrackBacking implements InputAudioTrackBacking {
 			timestamp * this.demuxer.audioInfo.sampleRate / PACKET_SIZE_IN_FRAMES,
 			(this.demuxer.dataSize - 1) / (PACKET_SIZE_IN_FRAMES * this.demuxer.audioInfo.blockSizeInBytes),
 		));
+		if (packetIndex < 0) {
+			return null;
+		}
 
 		const packet = await this.getPacketAtIndex(packetIndex, options);
 		if (packet) {