diff --git a/build/mp4-muxer.js b/build/mp4-muxer.js
index d97605c..dae52ba 100644
--- a/build/mp4-muxer.js
+++ b/build/mp4-muxer.js
@@ -533,20 +533,29 @@ var Mp4Muxer = (() => {
       // data
     ]);
   };
-  var dOps = (track) => box("dOps", [
-    u8(0),
-    // Version
-    u8(track.info.numberOfChannels),
-    // OutputChannelCount
-    u16(3840),
-    // PreSkip, should be at least 80 milliseconds worth of playback, measured in 48000 Hz samples
-    u32(track.info.sampleRate),
-    // InputSampleRate
-    fixed_8_8(0),
-    // OutputGain
-    u8(0)
-    // ChannelMappingFamily
-  ]);
+  var dOps = (track) => {
+    let preskip = 3840;
+    let gain = 0;
+    const description = track.info.decoderConfig.description;
+    if (description) {
+      const view2 = new DataView(ArrayBuffer.isView(description) ? description.buffer : description);
+      preskip = view2.getUint16(10, true);
+      gain = view2.getInt16(14, true);
+    }
+    return box("dOps", [
+      u8(0),
+      // Version
+      u8(track.info.numberOfChannels),
+      // OutputChannelCount
+      u16(preskip),
+      u32(track.info.sampleRate),
+      // InputSampleRate
+      fixed_8_8(gain),
+      // OutputGain
+      u8(0)
+      // ChannelMappingFamily
+    ]);
+  };
   var stts = (track) => {
     return fullBox("stts", 0, 0, [
       u32(track.timeToSampleTable.length),
diff --git a/build/mp4-muxer.min.js b/build/mp4-muxer.min.js
index ea26465..1f82449 100644
--- a/build/mp4-muxer.min.js
+++ b/build/mp4-muxer.min.js
@@ -1,5 +1,5 @@
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 If you want to offset all timestamps of a track such that the first one is zero, set firstTimestampBehavior: 'offset' in the options.
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+`);if(r(this,h).firstTimestampBehavior==="offset"||r(this,h).firstTimestampBehavior==="cross-track-offset"){s.firstDecodeTimestamp===void 0&&(s.firstDecodeTimestamp=i);let l;r(this,h).firstTimestampBehavior==="offset"?l=s.firstDecodeTimestamp:l=Math.min(r(this,S)?.firstDecodeTimestamp??1/0,r(this,x)?.firstDecodeTimestamp??1/0),i-=l,e-=l}if(i<s.lastDecodeTimestamp)throw new Error(`Timestamps must be monotonically increasing (DTS went from ${s.lastDecodeTimestamp*1e6} to ${i*1e6}).`);return s.lastDecodeTimestamp=i,{presentationTimestamp:e,decodeTimestamp:i}},te=new WeakSet,Be=function(e){if(r(this,h).fastStart==="fragmented")throw new Error("Can't finalize individual chunks if 'fastStart' is set to 'fragmented'.");if(e.currentChunk){if(e.finalizedChunks.push(e.currentChunk),r(this,X).push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||K(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),r(this,h).fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=r(this,f).pos;for(let i of e.currentChunk.samples)r(this,f).write(i.data),i.data=null;p(this,G,pe).call(this)}},Te=new WeakSet,Ze=function(e=!0){if(r(this,h).fastStart!=="fragmented")throw new Error("Can't finalize a fragment unless 'fastStart' is set to 'fragmented'.");let i=[r(this,S),r(this,x)].filter(d=>d&&d.currentChunk);if(i.length===0)return;let s=Ye(this,De)._++;if(s===1){let d=re(i,r(this,q),!0);r(this,f).writeBox(d)}let n=r(this,f).pos,a=We(s,i);r(this,f).writeBox(a);{let d=xe(!1),b=0;for(let L of i)for(let ie of L.currentChunk.samples)b+=ie.size;let v=r(this,f).measureBox(d)+b;v>=2**32&&(d.largeSize=!0,v=r(this,f).measureBox(d)+b),d.size=v,r(this,f).writeBox(d)}for(let d of i){d.currentChunk.offset=r(this,f).pos,d.currentChunk.moofOffset=n;for(let b of d.currentChunk.samples)r(this,f).write(b.data),b.data=null}let o=r(this,f).pos;r(this,f).seek(r(this,f).offsets.get(a));let l=We(s,i);r(this,f).writeBox(l),r(this,f).seek(o);for(let d of i)d.finalizedChunks.push(d.currentChunk),r(this,X).push(d.currentChunk),d.currentChunk=null;e&&p(this,G,pe).call(this)},G=new WeakSet,pe=function(){r(this,f)instanceof oe&&r(this,f).flush()},ge=new WeakSet,Ke=function(){if(r(this,ee))throw new Error("Cannot add new video or audio chunks after the file has been finalized.")};return gt(mi);})();
 if (typeof module === "object" && typeof module.exports === "object") Object.assign(module.exports, Mp4Muxer)
diff --git a/build/mp4-muxer.min.mjs b/build/mp4-muxer.min.mjs
index a582230..5e94c45 100644
--- a/build/mp4-muxer.min.mjs
+++ b/build/mp4-muxer.min.mjs
@@ -1,4 +1,4 @@
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object.")},Ue=new WeakSet,ot=function(){if(r(this,f).writeBox(et({holdsAvc:r(this,h).video?.codec==="avc",fragmented:r(this,h).fastStart==="fragmented"})),C(this,de,r(this,f).pos),r(this,h).fastStart==="in-memory")C(this,A,ye(!1));else if(r(this,h).fastStart!=="fragmented"){if(typeof r(this,h).fastStart=="object"){let e=p(this,Ie,ut).call(this);r(this,f).seek(r(this,f).pos+e)}C(this,A,ye(!0)),r(this,f).writeBox(r(this,A))}p(this,X,me).call(this)},Ie=new WeakSet,ut=function(){if(typeof r(this,h).fastStart!="object")return;let e=0,i=[r(this,h).fastStart.expectedVideoChunks,r(this,h).fastStart.expectedAudioChunks];for(let s of i)s&&(e+=(4+4)*Math.ceil(2/3*s),e+=4*s,e+=(4+4+4)*Math.ceil(2/3*s),e+=4*s,e+=8*s);return e+=4096,e},Me=new WeakSet,lt=function(){if(r(this,h).video&&C(this,S,{id:1,info:{type:"video",codec:r(this,h).video.codec,width:r(this,h).video.width,height:r(this,h).video.height,rotation:r(this,h).video.rotation??0,decoderConfig:null},timescale:r(this,h).video.frameRate??57600,samples:[],finalizedChunks:[],currentChunk:null,firstDecodeTimestamp:void 0,lastDecodeTimestamp:-1,timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,compactlyCodedChunkTable:[]}),r(this,h).audio){let e=p(this,_e,ht).call(this,2,r(this,h).audio.sampleRate,r(this,h).audio.numberOfChannels);C(this,x,{id:r(this,h).video?2:1,info:{type:"audio",codec:r(this,h).audio.codec,numberOfChannels:r(this,h).audio.numberOfChannels,sampleRate:r(this,h).audio.sampleRate,decoderConfig:{codec:r(this,h).audio.codec,description:e,numberOfChannels:r(this,h).audio.numberOfChannels,sampleRate:r(this,h).audio.sampleRate}},timescale:r(this,h).audio.sampleRate,samples:[],finalizedChunks:[],currentChunk:null,firstDecodeTimestamp:void 0,lastDecodeTimestamp:-1,timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,compactlyCodedChunkTable:[]})}},_e=new WeakSet,ht=function(e,i,s){let a=[96e3,88200,64e3,48e3,44100,32e3,24e3,22050,16e3,12e3,11025,8e3,7350].indexOf(i),o=s,l="";l+=e.toString(2).padStart(5,"0"),l+=a.toString(2).padStart(4,"0"),a===15&&(l+=i.toString(2).padStart(24,"0")),l+=o.toString(2).padStart(4,"0");let d=Math.ceil(l.length/8)*8;l=l.padEnd(d,"0");let b=new Uint8Array(l.length/8);for(let v=0;v<l.length;v+=8)b[v/8]=parseInt(l.slice(v,v+8),2);return b},pe=new WeakSet,Xe=function(e,i,s,n,a,o,l){let d=n/1e6,b=(n-(l??0))/1e6,v=a/1e6,L=p(this,Re,ft).call(this,d,b,e);return d=L.presentationTimestamp,b=L.decodeTimestamp,o?.decoderConfig&&(e.info.decoderConfig===null?e.info.decoderConfig=o.decoderConfig:Object.assign(e.info.decoderConfig,o.decoderConfig)),{presentationTimestamp:d,decodeTimestamp:b,duration:v,data:i,size:i.byteLength,type:s,timescaleUnitsToNextSample:O(v,e.timescale)}},D=new WeakSet,M=function(e,i){r(this,h).fastStart!=="fragmented"&&e.samples.push(i);let s=O(i.presentationTimestamp-i.decodeTimestamp,e.timescale);if(e.lastTimescaleUnits!==null){let a=O(i.decodeTimestamp,e.timescale,!1),o=Math.round(a-e.lastTimescaleUnits);if(e.lastTimescaleUnits+=o,e.lastSample.timescaleUnitsToNextSample=o,r(this,h).fastStart!=="fragmented"){let l=Z(e.timeToSampleTable);l.sampleCount===1?(l.sampleDelta=o,l.sampleCount++):l.sampleDelta===o?l.sampleCount++:(l.sampleCount--,e.timeToSampleTable.push({sampleCount:2,sampleDelta:o}));let d=Z(e.compositionTimeOffsetTable);d.sampleCompositionTimeOffset===s?d.sampleCount++:e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:s})}}else e.lastTimescaleUnits=0,r(this,h).fastStart!=="fragmented"&&(e.timeToSampleTable.push({sampleCount:1,sampleDelta:O(i.duration,e.timescale)}),e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:s}));e.lastSample=i;let n=!1;if(!e.currentChunk)n=!0;else{let a=i.presentationTimestamp-e.currentChunk.startTimestamp;if(r(this,h).fastStart==="fragmented"){let o=r(this,S)??r(this,x);e===o&&i.type==="key"&&a>=1&&(n=!0,p(this,ce,Ge).call(this))}else n=a>=.5}n&&(e.currentChunk&&p(this,te,Be).call(this,e),e.currentChunk={startTimestamp:i.presentationTimestamp,samples:[]}),e.currentChunk.samples.push(i)},Re=new WeakSet,ft=function(e,i,s){let n=r(this,h).firstTimestampBehavior==="strict",a=s.lastDecodeTimestamp===-1;if(n&&a&&i!==0)throw new Error(`The first chunk for your media track must have a timestamp of 0 (received DTS=${i}).Non-zero first timestamps are often caused by directly piping frames or audio data from a MediaStreamTrack into the encoder. Their timestamps are typically relative to the age of thedocument, which is probably what you want.
 
 If you want to offset all timestamps of a track such that the first one is zero, set firstTimestampBehavior: 'offset' in the options.
-`);if(i(this,h).firstTimestampBehavior==="offset"||i(this,h).firstTimestampBehavior==="cross-track-offset"){s.firstDecodeTimestamp===void 0&&(s.firstDecodeTimestamp=r);let l;i(this,h).firstTimestampBehavior==="offset"?l=s.firstDecodeTimestamp:l=Math.min(i(this,S)?.firstDecodeTimestamp??1/0,i(this,x)?.firstDecodeTimestamp??1/0),r-=l,e-=l}if(r<s.lastDecodeTimestamp)throw new Error(`Timestamps must be monotonically increasing (DTS went from ${s.lastDecodeTimestamp*1e6} to ${r*1e6}).`);return s.lastDecodeTimestamp=r,{presentationTimestamp:e,decodeTimestamp:r}},te=new WeakSet,Be=function(e){if(i(this,h).fastStart==="fragmented")throw new Error("Can't finalize individual chunks if 'fastStart' is set to 'fragmented'.");if(e.currentChunk){if(e.finalizedChunks.push(e.currentChunk),i(this,q).push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||Z(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),i(this,h).fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=i(this,m).pos;for(let r of e.currentChunk.samples)i(this,m).write(r.data),r.data=null;p(this,X,fe).call(this)}},ce=new WeakSet,Ge=function(e=!0){if(i(this,h).fastStart!=="fragmented")throw new Error("Can't finalize a fragment unless 'fastStart' is set to 'fragmented'.");let r=[i(this,S),i(this,x)].filter(d=>d&&d.currentChunk);if(r.length===0)return;let s=Qe(this,ze)._++;if(s===1){let d=ie(r,i(this,W),!0);i(this,m).writeBox(d)}let n=i(this,m).pos,a=$e(s,r);i(this,m).writeBox(a);{let d=we(!1),b=0;for(let L of r)for(let re of L.currentChunk.samples)b+=re.size;let v=i(this,m).measureBox(d)+b;v>=2**32&&(d.largeSize=!0,v=i(this,m).measureBox(d)+b),d.size=v,i(this,m).writeBox(d)}for(let d of r){d.currentChunk.offset=i(this,m).pos,d.currentChunk.moofOffset=n;for(let b of d.currentChunk.samples)i(this,m).write(b.data),b.data=null}let o=i(this,m).pos;i(this,m).seek(i(this,m).offsets.get(a));let l=$e(s,r);i(this,m).writeBox(l),i(this,m).seek(o);for(let d of r)d.finalizedChunks.push(d.currentChunk),i(this,q).push(d.currentChunk),d.currentChunk=null;e&&p(this,X,fe).call(this)},X=new WeakSet,fe=function(){i(this,m)instanceof ne&&i(this,m).flush()},be=new WeakSet,Ze=function(){if(i(this,ee))throw new Error("Cannot add new video or audio chunks after the file has been finalized.")};export{Se as ArrayBufferTarget,xe as FileSystemWritableFileStreamTarget,qe as Muxer,K as StreamTarget};
+`);if(r(this,h).firstTimestampBehavior==="offset"||r(this,h).firstTimestampBehavior==="cross-track-offset"){s.firstDecodeTimestamp===void 0&&(s.firstDecodeTimestamp=i);let l;r(this,h).firstTimestampBehavior==="offset"?l=s.firstDecodeTimestamp:l=Math.min(r(this,S)?.firstDecodeTimestamp??1/0,r(this,x)?.firstDecodeTimestamp??1/0),i-=l,e-=l}if(i<s.lastDecodeTimestamp)throw new Error(`Timestamps must be monotonically increasing (DTS went from ${s.lastDecodeTimestamp*1e6} to ${i*1e6}).`);return s.lastDecodeTimestamp=i,{presentationTimestamp:e,decodeTimestamp:i}},te=new WeakSet,Be=function(e){if(r(this,h).fastStart==="fragmented")throw new Error("Can't finalize individual chunks if 'fastStart' is set to 'fragmented'.");if(e.currentChunk){if(e.finalizedChunks.push(e.currentChunk),r(this,q).push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||Z(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),r(this,h).fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=r(this,f).pos;for(let i of e.currentChunk.samples)r(this,f).write(i.data),i.data=null;p(this,X,me).call(this)}},ce=new WeakSet,Ge=function(e=!0){if(r(this,h).fastStart!=="fragmented")throw new Error("Can't finalize a fragment unless 'fastStart' is set to 'fragmented'.");let i=[r(this,S),r(this,x)].filter(d=>d&&d.currentChunk);if(i.length===0)return;let s=Qe(this,ze)._++;if(s===1){let d=re(i,r(this,W),!0);r(this,f).writeBox(d)}let n=r(this,f).pos,a=$e(s,i);r(this,f).writeBox(a);{let d=ye(!1),b=0;for(let L of i)for(let ie of L.currentChunk.samples)b+=ie.size;let v=r(this,f).measureBox(d)+b;v>=2**32&&(d.largeSize=!0,v=r(this,f).measureBox(d)+b),d.size=v,r(this,f).writeBox(d)}for(let d of i){d.currentChunk.offset=r(this,f).pos,d.currentChunk.moofOffset=n;for(let b of d.currentChunk.samples)r(this,f).write(b.data),b.data=null}let o=r(this,f).pos;r(this,f).seek(r(this,f).offsets.get(a));let l=$e(s,i);r(this,f).writeBox(l),r(this,f).seek(o);for(let d of i)d.finalizedChunks.push(d.currentChunk),r(this,q).push(d.currentChunk),d.currentChunk=null;e&&p(this,X,me).call(this)},X=new WeakSet,me=function(){r(this,f)instanceof ne&&r(this,f).flush()},be=new WeakSet,Ze=function(){if(r(this,ee))throw new Error("Cannot add new video or audio chunks after the file has been finalized.")};export{Se as ArrayBufferTarget,xe as FileSystemWritableFileStreamTarget,qe as Muxer,K as StreamTarget};
diff --git a/build/mp4-muxer.mjs b/build/mp4-muxer.mjs
index db0471a..96fdf3b 100644
--- a/build/mp4-muxer.mjs
+++ b/build/mp4-muxer.mjs
@@ -505,20 +505,29 @@ var esds = (track) => {
     // data
   ]);
 };
-var dOps = (track) => box("dOps", [
-  u8(0),
-  // Version
-  u8(track.info.numberOfChannels),
-  // OutputChannelCount
-  u16(3840),
-  // PreSkip, should be at least 80 milliseconds worth of playback, measured in 48000 Hz samples
-  u32(track.info.sampleRate),
-  // InputSampleRate
-  fixed_8_8(0),
-  // OutputGain
-  u8(0)
-  // ChannelMappingFamily
-]);
+var dOps = (track) => {
+  let preskip = 3840;
+  let gain = 0;
+  const description = track.info.decoderConfig.description;
+  if (description) {
+    const view2 = new DataView(ArrayBuffer.isView(description) ? description.buffer : description);
+    preskip = view2.getUint16(10, true);
+    gain = view2.getInt16(14, true);
+  }
+  return box("dOps", [
+    u8(0),
+    // Version
+    u8(track.info.numberOfChannels),
+    // OutputChannelCount
+    u16(preskip),
+    u32(track.info.sampleRate),
+    // InputSampleRate
+    fixed_8_8(gain),
+    // OutputGain
+    u8(0)
+    // ChannelMappingFamily
+  ]);
+};
 var stts = (track) => {
   return fullBox("stts", 0, 0, [
     u32(track.timeToSampleTable.length),
diff --git a/src/box.ts b/src/box.ts
index 48f8037..5d0cf14 100644
--- a/src/box.ts
+++ b/src/box.ts
@@ -445,14 +445,29 @@ export const esds = (track: Track) => {
 };
 
 /** Opus Specific Box. */
-export const dOps = (track: AudioTrack) => box('dOps', [
-	u8(0), // Version
-	u8(track.info.numberOfChannels), // OutputChannelCount
-	u16(3840), // PreSkip, should be at least 80 milliseconds worth of playback, measured in 48000 Hz samples
-	u32(track.info.sampleRate), // InputSampleRate
-	fixed_8_8(0), // OutputGain
-	u8(0) // ChannelMappingFamily
-]);
+export const dOps = (track: AudioTrack) => {
+	// Default PreSkip, should be at least 80 milliseconds worth of playback, measured in 48000 Hz samples
+	let preskip = 3840;
+	let gain = 0;
+
+	// Read preskip and from codec private data from the encoder
+	// https://www.rfc-editor.org/rfc/rfc7845#section-5
+	const description = track.info.decoderConfig.description;
+	if (description) {
+		const view = new DataView(ArrayBuffer.isView(description) ? description.buffer : description);
+		preskip = view.getUint16(10, true);
+		gain = view.getInt16(14, true);
+	}
+
+	return box('dOps', [
+		u8(0), // Version
+		u8(track.info.numberOfChannels), // OutputChannelCount
+		u16(preskip),
+		u32(track.info.sampleRate), // InputSampleRate
+		fixed_8_8(gain), // OutputGain
+		u8(0) // ChannelMappingFamily
+	]);
+};
 
 /**
  * Time-To-Sample Box: Stores duration information for a media's samples, providing a mapping from a time in a media