diff --git a/plugins/prebuffer-mixin/src/au.ts b/plugins/prebuffer-mixin/src/au.ts
index 162425c8b..476dec7b2 100644
--- a/plugins/prebuffer-mixin/src/au.ts
+++ b/plugins/prebuffer-mixin/src/au.ts
@@ -29,11 +29,8 @@ export function createAUHeader(
   // Combine size and index into a single value
   const combinedValue = (frameSize << indexLength) | auIndex;
 
-  // Convert to bytes (little-endian within the multi-byte value)
-  const header = new Buffer(totalBytes);
-  for (let i = 0; i < totalBytes; i++) {
-    header[i] = (combinedValue >> ((totalBytes - 1 - i) * 8)) & 0xFF;
-  }
+  const header = Buffer.alloc(totalBytes);
+  header.writeUintBE(combinedValue, 0, totalBytes);
 
   return header;
 }
diff --git a/plugins/prebuffer-mixin/src/flv.ts b/plugins/prebuffer-mixin/src/flv.ts
index 50b5f1a05..ce6df4355 100644
--- a/plugins/prebuffer-mixin/src/flv.ts
+++ b/plugins/prebuffer-mixin/src/flv.ts
@@ -224,10 +224,7 @@ function parseNALUUnits(buffer: Buffer, offset: number, length: number, naluLeng
   }
 
   while (pos + naluLengthSize <= offset + length) {
-    let naluLength = 0;
-    for (let i = 0; i < naluLengthSize; i++) {
-      naluLength = (naluLength << 8) | buffer[pos + i];
-    }
+    const naluLength = buffer.readUintBE(pos, naluLengthSize);
     pos += naluLengthSize;
 
     if (naluLength === 0) {