diff --git a/dev/convert.html b/dev/convert.html
index 24afb95..4830820 100644
--- a/dev/convert.html
+++ b/dev/convert.html
@@ -24,7 +24,7 @@
 			chunked: true,
 			chunkSize: 2**20
 		});
-		const outputFormat = new Mediabunny.Mp4OutputFormat({});
+		const outputFormat = new Mediabunny.Mp3OutputFormat({});
 
 		const button = document.createElement('button');
 		button.textContent = 'Cancel';
@@ -41,7 +41,7 @@
 				target
 			}),
 			audio: {
-				discard: true,
+				//discard: true,
 				//codec: 'opus',
 				//bitrate: 128000,
 				//numberOfChannels: 1,
@@ -94,8 +94,8 @@
 				//height: 100,
 			}),
 			trim: {
-				start: 0,
-				end: 20
+				//start: 0,
+				//end: 20
 			},
 		});
 		console.log(conversion);
diff --git a/docs/guide/media-sources.md b/docs/guide/media-sources.md
index 5889b30..9b281f7 100644
--- a/docs/guide/media-sources.md
+++ b/docs/guide/media-sources.md
@@ -123,6 +123,7 @@ const sampleSource = new VideoSampleSource({
 });
 
 await sampleSource.add(videoSample);
+videoSample.close(); // If it's not needed anymore
 
 // You may optionally force samples to be encoded as key frames:
 await sampleSource.add(videoSample, { keyFrame: true });
@@ -285,6 +286,7 @@ const sampleSource = new AudioSampleSource({
 });
 
 await sampleSource.add(audioSample);
+audioSample.close(); // If it's not needed anymore
 ```
 
 ### `AudioBufferSource`
diff --git a/package-lock.json b/package-lock.json
index 0655037..9c91c82 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mediabunny",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mediabunny",
-      "version": "1.7.2",
+      "version": "1.7.3",
       "license": "MPL-2.0",
       "workspaces": [
         "packages/*"
@@ -5900,9 +5900,9 @@
       }
     },
     "node_modules/mediabunny": {
-      "version": "1.7.1",
-      "resolved": "https://registry.npmjs.org/mediabunny/-/mediabunny-1.7.1.tgz",
-      "integrity": "sha512-y9s+Vf6TLhXeVjvlJFSmHRrwUQi2CJCMhxthm6nfhBO1XHJhcOqNOxu4CjhYyjoWgVZB5pkPKyWgZxpPOZfglQ==",
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/mediabunny/-/mediabunny-1.7.2.tgz",
+      "integrity": "sha512-M84Ice7IR1OpWmmDoUh691Hjpf+w2UTt+VWUH0WkiF5MdfFZ63OAF2TmOhbAEVZyvQ088xlvmaT01t00Qgy/QA==",
       "license": "MPL-2.0",
       "peer": true,
       "workspaces": [
@@ -9017,7 +9017,7 @@
     },
     "packages/mp3-encoder": {
       "name": "@mediabunny/mp3-encoder",
-      "version": "1.7.2",
+      "version": "1.7.3",
       "license": "MPL-2.0",
       "devDependencies": {
         "@types/emscripten": "^1.40.1"
diff --git a/package.json b/package.json
index 709c529..d258406 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "mediabunny",
   "author": "Vanilagy",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "description": "Pure TypeScript media toolkit for reading, writing, and converting media files, directly in the browser.",
   "type": "module",
   "workspaces": [
diff --git a/packages/mp3-encoder/package.json b/packages/mp3-encoder/package.json
index 14f4776..961c5d2 100644
--- a/packages/mp3-encoder/package.json
+++ b/packages/mp3-encoder/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@mediabunny/mp3-encoder",
   "author": "Vanilagy",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "description": "MP3 encoder extension for Mediabunny, based on LAME.",
   "main": "./dist/bundles/mediabunny-mp3-encoder.mjs",
   "module": "./dist/bundles/mediabunny-mp3-encoder.mjs",
diff --git a/src/media-source.ts b/src/media-source.ts
index 3860552..1f7295a 100644
--- a/src/media-source.ts
+++ b/src/media-source.ts
@@ -323,17 +323,17 @@ class VideoEncoderWrapper {
 
 			if (this.customEncoder) {
 				this.customEncoderQueueSize++;
-				const promise = this.customEncoderCallSerializer
-					.call(() => this.customEncoder!.encode(videoSample, finalEncodeOptions))
-					.then(() => {
-						this.customEncoderQueueSize--;
 
-						if (shouldClose) {
-							videoSample.close();
-						}
-					})
-					.catch((error: Error) => {
-						this.encoderError ??= error;
+				// We clone the sample so it cannot be closed on us from the outside before it reaches the encoder
+				const clonedSample = videoSample.clone();
+
+				const promise = this.customEncoderCallSerializer
+					.call(() => this.customEncoder!.encode(clonedSample, finalEncodeOptions))
+					.then(() => this.customEncoderQueueSize--)
+					.catch((error: Error) => this.encoderError ??= error)
+					.finally(() => {
+						clonedSample.close();
+						// `videoSample` gets closed in the finally block at the end of the method
 					});
 
 				if (this.customEncoderQueueSize >= 4) {
@@ -440,6 +440,7 @@ class VideoEncoderWrapper {
 						void this.muxer!.addEncodedVideoPacket(this.source._connectedTrack!, packet, meta);
 					},
 					error: (error) => {
+						error.stack = new Error().stack; // Provide a more useful stack trace
 						this.encoderError ??= error;
 					},
 				});
@@ -483,7 +484,6 @@ class VideoEncoderWrapper {
 
 	checkForEncoderError() {
 		if (this.encoderError) {
-			this.encoderError.stack = new Error().stack; // Provide a more useful stack trace
 			throw this.encoderError;
 		}
 	}
@@ -939,17 +939,17 @@ class AudioEncoderWrapper {
 
 			if (this.customEncoder) {
 				this.customEncoderQueueSize++;
-				const promise = this.customEncoderCallSerializer
-					.call(() => this.customEncoder!.encode(audioSample))
-					.then(() => {
-						this.customEncoderQueueSize--;
 
-						if (shouldClose) {
-							audioSample.close();
-						}
-					})
-					.catch((error: Error) => {
-						this.encoderError ??= error;
+				// We clone the sample so it cannot be closed on us from the outside before it reaches the encoder
+				const clonedSample = audioSample.clone();
+
+				const promise = this.customEncoderCallSerializer
+					.call(() => this.customEncoder!.encode(clonedSample))
+					.then(() => this.customEncoderQueueSize--)
+					.catch((error: Error) => this.encoderError ??= error)
+					.finally(() => {
+						clonedSample.close();
+						// `audioSample` gets closed in the finally block at the end of the method
 					});
 
 				if (this.customEncoderQueueSize >= 4) {
@@ -1128,6 +1128,7 @@ class AudioEncoderWrapper {
 						void this.muxer!.addEncodedAudioPacket(this.source._connectedTrack!, packet, meta);
 					},
 					error: (error) => {
+						error.stack = new Error().stack; // Provide a more useful stack trace
 						this.encoderError ??= error;
 					},
 				});
@@ -1266,7 +1267,6 @@ class AudioEncoderWrapper {
 
 	checkForEncoderError() {
 		if (this.encoderError) {
-			this.encoderError.stack = new Error().stack; // Provide a more useful stack trace
 			throw this.encoderError;
 		}
 	}