diff --git a/build/mp4-muxer.js b/build/mp4-muxer.js
index ad9f849..0409da5 100644
--- a/build/mp4-muxer.js
+++ b/build/mp4-muxer.js
@@ -415,7 +415,46 @@ var Mp4Muxer = (() => {
     i16(65535)
     // Pre-defined
   ], [
-    VIDEO_CODEC_TO_CONFIGURATION_BOX[track.info.codec](track)
+    VIDEO_CODEC_TO_CONFIGURATION_BOX[track.info.codec](track),
+    track.info.decoderConfig.colorSpace ? colr(track) : null
+  ]);
+  var COLOR_PRIMARIES_MAP = {
+    "bt709": 1,
+    // ITU-R BT.709
+    "bt470bg": 5,
+    // ITU-R BT.470BG
+    "smpte170m": 6
+    // ITU-R BT.601 525 - SMPTE 170M
+  };
+  var TRANSFER_CHARACTERISTICS_MAP = {
+    "bt709": 1,
+    // ITU-R BT.709
+    "smpte170m": 6,
+    // SMPTE 170M
+    "iec61966-2-1": 13
+    // IEC 61966-2-1
+  };
+  var MATRIX_COEFFICIENTS_MAP = {
+    "rgb": 0,
+    // Identity
+    "bt709": 1,
+    // ITU-R BT.709
+    "bt470bg": 5,
+    // ITU-R BT.470BG
+    "smpte170m": 6
+    // SMPTE 170M
+  };
+  var colr = (track) => box("colr", [
+    ascii("nclx"),
+    // Colour type
+    u16(COLOR_PRIMARIES_MAP[track.info.decoderConfig.colorSpace.primaries]),
+    // Colour primaries
+    u16(TRANSFER_CHARACTERISTICS_MAP[track.info.decoderConfig.colorSpace.transfer]),
+    // Transfer characteristics
+    u16(MATRIX_COEFFICIENTS_MAP[track.info.decoderConfig.colorSpace.matrix]),
+    // Matrix coefficients
+    u8((track.info.decoderConfig.colorSpace.fullRange ? 1 : 0) << 7)
+    // Full range flag
   ]);
   var avcC = (track) => track.info.decoderConfig && box("avcC", [
     // For AVC, description is an AVCDecoderConfigurationRecord, so nothing else to do here
diff --git a/build/mp4-muxer.min.js b/build/mp4-muxer.min.js
index f03f62b..a0e1541 100644
--- a/build/mp4-muxer.min.js
+++ b/build/mp4-muxer.min.js
@@ -1,5 +1,5 @@
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l=p(this,Te,Ze).call(this,i(this,x),e,r,s,n,o,a);if(i(this,d).fastStart==="fragmented"&&i(this,S)){for(;i(this,L).length>0&&i(this,L)[0].decodeTimestamp<=l.decodeTimestamp;){let m=i(this,L).shift();p(this,U,M).call(this,i(this,S),m)}l.decodeTimestamp<=i(this,S).lastDecodeTimestamp?p(this,U,M).call(this,i(this,x),l):i(this,P).push(l)}else p(this,U,M).call(this,i(this,x),l)}addAudioChunk(e,r,s){if(!(e instanceof EncodedAudioChunk))throw new TypeError("addAudioChunk's first argument (sample) must be of type EncodedAudioChunk.");if(r&&typeof r!="object")throw new TypeError("addAudioChunk's second argument (meta), when provided, must be an object.");if(s!==void 0&&(!Number.isFinite(s)||s<0))throw new TypeError("addAudioChunk's third argument (timestamp), when provided, must be a non-negative real number.");let n=new Uint8Array(e.byteLength);e.copyTo(n),this.addAudioChunkRaw(n,e.type,s??e.timestamp,e.duration,r)}addAudioChunkRaw(e,r,s,n,o){if(!(e instanceof Uint8Array))throw new TypeError("addAudioChunkRaw's first argument (data) must be an instance of Uint8Array.");if(r!=="key"&&r!=="delta")throw new TypeError("addAudioChunkRaw's second argument (type) must be either 'key' or 'delta'.");if(!Number.isFinite(s)||s<0)throw new TypeError("addAudioChunkRaw's third argument (timestamp) must be a non-negative real number.");if(!Number.isFinite(n)||n<0)throw new TypeError("addAudioChunkRaw's fourth argument (duration) must be a non-negative real number.");if(o&&typeof o!="object")throw new TypeError("addAudioChunkRaw's fifth argument (meta), when provided, must be an object.");if(p(this,Ce,Qe).call(this),!i(this,d).audio)throw new Error("No audio track declared.");if(typeof i(this,d).fastStart=="object"&&i(this,S).samples.length===i(this,d).fastStart.expectedAudioChunks)throw new Error(`Cannot add more audio chunks than specified in 'fastStart' (${i(this,d).fastStart.expectedAudioChunks}).`);let a=p(this,Te,Ze).call(this,i(this,S),e,r,s,n,o);if(i(this,d).fastStart==="fragmented"&&i(this,x)){for(;i(this,P).length>0&&i(this,P)[0].decodeTimestamp<=a.decodeTimestamp;){let l=i(this,P).shift();p(this,U,M).call(this,i(this,x),l)}a.decodeTimestamp<=i(this,x).lastDecodeTimestamp?p(this,U,M).call(this,i(this,S),a):i(this,L).push(a)}else p(this,U,M).call(this,i(this,S),a)}finalize(){if(i(this,ie))throw new Error("Cannot finalize a muxer more than once.");if(i(this,d).fastStart==="fragmented"){for(let r of i(this,P))p(this,U,M).call(this,i(this,x),r);for(let r of i(this,L))p(this,U,M).call(this,i(this,S),r);p(this,ge,Ke).call(this,!1)}else i(this,x)&&p(this,se,ze).call(this,i(this,x)),i(this,S)&&p(this,se,ze).call(this,i(this,S));let e=[i(this,x),i(this,S)].filter(Boolean);if(i(this,d).fastStart==="in-memory"){let r;for(let n=0;n<2;n++){let o=oe(e,i(this,X)),a=i(this,h).measureBox(o);r=i(this,h).measureBox(i(this,A));let l=i(this,h).pos+a+r;for(let m of i(this,G)){m.offset=l;for(let{data:T}of m.samples)l+=T.byteLength,r+=T.byteLength}if(l<2**32)break;r>=2**32&&(i(this,A).largeSize=!0)}let s=oe(e,i(this,X));i(this,h).writeBox(s),i(this,A).size=r,i(this,h).writeBox(i(this,A));for(let n of i(this,G))for(let o of n.samples)i(this,h).write(o.data),o.data=null}else if(i(this,d).fastStart==="fragmented"){let r=i(this,h).pos,s=nt(e);i(this,h).writeBox(s);let n=i(this,h).pos-r;i(this,h).seek(i(this,h).pos-4),i(this,h).writeU32(n)}else{let r=i(this,h).offsets.get(i(this,A)),s=i(this,h).pos-r;i(this,A).size=s,i(this,A).largeSize=s>=2**32,i(this,h).patchBox(i(this,A));let n=oe(e,i(this,X));if(typeof i(this,d).fastStart=="object"){i(this,h).seek(i(this,be)),i(this,h).writeBox(n);let o=r-i(this,h).pos;i(this,h).writeBox(it(o))}else i(this,h).writeBox(n)}p(this,Z,ce).call(this),i(this,h).finalize(),C(this,ie,!0)}};d=new WeakMap,h=new WeakMap,be=new WeakMap,A=new WeakMap,x=new WeakMap,S=new WeakMap,X=new WeakMap,G=new WeakMap,Ie=new WeakMap,P=new WeakMap,L=new WeakMap,ie=new WeakMap,De=new WeakSet,ut=function(e){if(typeof e!="object")throw new TypeError("The muxer requires an options object to be passed to its constructor.");if(!(e.target instanceof W))throw new TypeError("The target must be provided and an instance of Target.");if(e.video){if(!pr.includes(e.video.codec))throw new TypeError(`Unsupported video codec: ${e.video.codec}`);if(!Number.isInteger(e.video.width)||e.video.width<=0)throw new TypeError(`Invalid video width: ${e.video.width}. Must be a positive integer.`);if(!Number.isInteger(e.video.height)||e.video.height<=0)throw new TypeError(`Invalid video height: ${e.video.height}. Must be a positive integer.`);let r=e.video.rotation;if(typeof r=="number"&&![0,90,180,270].includes(r))throw new TypeError(`Invalid video rotation: ${r}. Has to be 0, 90, 180 or 270.`);if(Array.isArray(r)&&(r.length!==9||r.some(s=>typeof s!="number")))throw new TypeError(`Invalid video transformation matrix: ${r.join()}`);if(e.video.frameRate!==void 0&&(!Number.isInteger(e.video.frameRate)||e.video.frameRate<=0))throw new TypeError(`Invalid video frame rate: ${e.video.frameRate}. Must be a positive integer.`)}if(e.audio){if(!cr.includes(e.audio.codec))throw new TypeError(`Unsupported audio codec: ${e.audio.codec}`);if(!Number.isInteger(e.audio.numberOfChannels)||e.audio.numberOfChannels<=0)throw new TypeError(`Invalid number of audio channels: ${e.audio.numberOfChannels}. Must be a positive integer.`);if(!Number.isInteger(e.audio.sampleRate)||e.audio.sampleRate<=0)throw new TypeError(`Invalid audio sample rate: ${e.audio.sampleRate}. Must be a positive integer.`)}if(e.firstTimestampBehavior&&!Tr.includes(e.firstTimestampBehavior))throw new TypeError(`Invalid first timestamp behavior: ${e.firstTimestampBehavior}`);if(typeof e.fastStart=="object"){if(e.video){if(e.fastStart.expectedVideoChunks===void 0)throw new TypeError("'fastStart' is an object but is missing property 'expectedVideoChunks'.");if(!Number.isInteger(e.fastStart.expectedVideoChunks)||e.fastStart.expectedVideoChunks<0)throw new TypeError("'expectedVideoChunks' must be a non-negative integer.")}if(e.audio){if(e.fastStart.expectedAudioChunks===void 0)throw new TypeError("'fastStart' is an object but is missing property 'expectedAudioChunks'.");if(!Number.isInteger(e.fastStart.expectedAudioChunks)||e.fastStart.expectedAudioChunks<0)throw new TypeError("'expectedAudioChunks' must be a non-negative integer.")}}else if(![!1,"in-memory","fragmented"].includes(e.fastStart))throw new TypeError("'fastStart' option must be false, 'in-memory', 'fragmented' or an object.")},Me=new WeakSet,lt=function(){if(i(this,h).writeBox(rt({holdsAvc:i(this,d).video?.codec==="avc",fragmented:i(this,d).fastStart==="fragmented"})),C(this,be,i(this,h).pos),i(this,d).fastStart==="in-memory")C(this,A,ve(!1));else if(i(this,d).fastStart!=="fragmented"){if(typeof i(this,d).fastStart=="object"){let e=p(this,Re,dt).call(this);i(this,h).seek(i(this,h).pos+e)}C(this,A,ve(!0)),i(this,h).writeBox(i(this,A))}p(this,Z,ce).call(this)},Re=new WeakSet,dt=function(){if(typeof i(this,d).fastStart!="object")return;let e=0,r=[i(this,d).fastStart.expectedVideoChunks,i(this,d).fastStart.expectedAudioChunks];for(let s of r)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},Ve=new WeakSet,ht=function(){if(i(this,d).video&&C(this,x,{id:1,info:{type:"video",codec:i(this,d).video.codec,width:i(this,d).video.width,height:i(this,d).video.height,rotation:i(this,d).video.rotation??0,decoderConfig:null},timescale:i(this,d).video.frameRate??57600,samples:[],finalizedChunks:[],currentChunk:null,firstDecodeTimestamp:void 0,lastDecodeTimestamp:-1,timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,compactlyCodedChunkTable:[]}),i(this,d).audio&&(C(this,S,{id:i(this,d).video?2:1,info:{type:"audio",codec:i(this,d).audio.codec,numberOfChannels:i(this,d).audio.numberOfChannels,sampleRate:i(this,d).audio.sampleRate,decoderConfig:null},timescale:i(this,d).audio.sampleRate,samples:[],finalizedChunks:[],currentChunk:null,firstDecodeTimestamp:void 0,lastDecodeTimestamp:-1,timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,compactlyCodedChunkTable:[]}),i(this,d).audio.codec==="aac")){let e=p(this,_e,ft).call(this,2,i(this,d).audio.sampleRate,i(this,d).audio.numberOfChannels);i(this,S).info.decoderConfig={codec:i(this,d).audio.codec,description:e,numberOfChannels:i(this,d).audio.numberOfChannels,sampleRate:i(this,d).audio.sampleRate}}},_e=new WeakSet,ft=function(e,r,s){let o=[96e3,88200,64e3,48e3,44100,32e3,24e3,22050,16e3,12e3,11025,8e3,7350].indexOf(r),a=s,l="";l+=e.toString(2).padStart(5,"0"),l+=o.toString(2).padStart(4,"0"),o===15&&(l+=r.toString(2).padStart(24,"0")),l+=a.toString(2).padStart(4,"0");let m=Math.ceil(l.length/8)*8;l=l.padEnd(m,"0");let T=new Uint8Array(l.length/8);for(let v=0;v<l.length;v+=8)T[v/8]=parseInt(l.slice(v,v+8),2);return T},Te=new WeakSet,Ze=function(e,r,s,n,o,a,l){let m=n/1e6,T=(n-(l??0))/1e6,v=o/1e6,j=p(this,Ne,mt).call(this,m,T,e);return m=j.presentationTimestamp,T=j.decodeTimestamp,a?.decoderConfig&&(e.info.decoderConfig===null?e.info.decoderConfig=a.decoderConfig:Object.assign(e.info.decoderConfig,a.decoderConfig)),{presentationTimestamp:m,decodeTimestamp:T,duration:v,data:r,size:r.byteLength,type:s,timescaleUnitsToNextSample:B(v,e.timescale)}},U=new WeakSet,M=function(e,r){i(this,d).fastStart!=="fragmented"&&e.samples.push(r);let s=B(r.presentationTimestamp-r.decodeTimestamp,e.timescale);if(e.lastTimescaleUnits!==null){let o=B(r.decodeTimestamp,e.timescale,!1),a=Math.round(o-e.lastTimescaleUnits);if(e.lastTimescaleUnits+=a,e.lastSample.timescaleUnitsToNextSample=a,i(this,d).fastStart!=="fragmented"){let l=Q(e.timeToSampleTable);l.sampleCount===1?(l.sampleDelta=a,l.sampleCount++):l.sampleDelta===a?l.sampleCount++:(l.sampleCount--,e.timeToSampleTable.push({sampleCount:2,sampleDelta:a}));let m=Q(e.compositionTimeOffsetTable);m.sampleCompositionTimeOffset===s?m.sampleCount++:e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:s})}}else e.lastTimescaleUnits=0,i(this,d).fastStart!=="fragmented"&&(e.timeToSampleTable.push({sampleCount:1,sampleDelta:B(r.duration,e.timescale)}),e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:s}));e.lastSample=r;let n=!1;if(!e.currentChunk)n=!0;else{let o=r.presentationTimestamp-e.currentChunk.startTimestamp;if(i(this,d).fastStart==="fragmented"){let a=i(this,x)??i(this,S);e===a&&r.type==="key"&&o>=1&&(n=!0,p(this,ge,Ke).call(this))}else n=o>=.5}n&&(e.currentChunk&&p(this,se,ze).call(this,e),e.currentChunk={startTimestamp:r.presentationTimestamp,samples:[]}),e.currentChunk.samples.push(r)},Ne=new WeakSet,mt=function(e,r,s){let n=i(this,d).firstTimestampBehavior==="strict",o=s.lastDecodeTimestamp===-1;if(n&&o&&r!==0)throw new Error(`The first chunk for your media track must have a timestamp of 0 (received DTS=${r}).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(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,x)?.firstDecodeTimestamp??1/0,r(this,S)?.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}},se=new WeakSet,Oe=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,G).push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||Q(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,d).pos;for(let i of e.currentChunk.samples)r(this,d).write(i.data),i.data=null;p(this,Z,ce).call(this)}},ge=new WeakSet,Ke=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,x),r(this,S)].filter(m=>m&&m.currentChunk);if(i.length===0)return;let s=Je(this,De)._++;if(s===1){let m=oe(i,r(this,X),!0);r(this,d).writeBox(m)}let n=r(this,d).pos,o=qe(s,i);r(this,d).writeBox(o);{let m=ve(!1),b=0;for(let j of i)for(let ne of j.currentChunk.samples)b+=ne.size;let v=r(this,d).measureBox(m)+b;v>=2**32&&(m.largeSize=!0,v=r(this,d).measureBox(m)+b),m.size=v,r(this,d).writeBox(m)}for(let m of i){m.currentChunk.offset=r(this,d).pos,m.currentChunk.moofOffset=n;for(let b of m.currentChunk.samples)r(this,d).write(b.data),b.data=null}let a=r(this,d).pos;r(this,d).seek(r(this,d).offsets.get(o));let l=qe(s,i);r(this,d).writeBox(l),r(this,d).seek(a);for(let m of i)m.finalizedChunks.push(m.currentChunk),r(this,G).push(m.currentChunk),m.currentChunk=null;e&&p(this,Z,ce).call(this)},Z=new WeakSet,ce=function(){r(this,d)instanceof ue&&r(this,d).flush()},we=new WeakSet,Qe=function(){if(r(this,re))throw new Error("Cannot add new video or audio chunks after the file has been finalized.")};return wt(pi);})();
+`);if(i(this,d).firstTimestampBehavior==="offset"||i(this,d).firstTimestampBehavior==="cross-track-offset"){s.firstDecodeTimestamp===void 0&&(s.firstDecodeTimestamp=r);let l;i(this,d).firstTimestampBehavior==="offset"?l=s.firstDecodeTimestamp:l=Math.min(i(this,x)?.firstDecodeTimestamp??1/0,i(this,S)?.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}},se=new WeakSet,ze=function(e){if(i(this,d).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,G).push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||Q(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),i(this,d).fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=i(this,h).pos;for(let r of e.currentChunk.samples)i(this,h).write(r.data),r.data=null;p(this,Z,ce).call(this)}},ge=new WeakSet,Ke=function(e=!0){if(i(this,d).fastStart!=="fragmented")throw new Error("Can't finalize a fragment unless 'fastStart' is set to 'fragmented'.");let r=[i(this,x),i(this,S)].filter(m=>m&&m.currentChunk);if(r.length===0)return;let s=Je(this,Ie)._++;if(s===1){let m=oe(r,i(this,X),!0);i(this,h).writeBox(m)}let n=i(this,h).pos,o=qe(s,r);i(this,h).writeBox(o);{let m=ve(!1),T=0;for(let j of r)for(let ne of j.currentChunk.samples)T+=ne.size;let v=i(this,h).measureBox(m)+T;v>=2**32&&(m.largeSize=!0,v=i(this,h).measureBox(m)+T),m.size=v,i(this,h).writeBox(m)}for(let m of r){m.currentChunk.offset=i(this,h).pos,m.currentChunk.moofOffset=n;for(let T of m.currentChunk.samples)i(this,h).write(T.data),T.data=null}let a=i(this,h).pos;i(this,h).seek(i(this,h).offsets.get(o));let l=qe(s,r);i(this,h).writeBox(l),i(this,h).seek(a);for(let m of r)m.finalizedChunks.push(m.currentChunk),i(this,G).push(m.currentChunk),m.currentChunk=null;e&&p(this,Z,ce).call(this)},Z=new WeakSet,ce=function(){i(this,h)instanceof ue&&i(this,h).flush()},Ce=new WeakSet,Qe=function(){if(i(this,ie))throw new Error("Cannot add new video or audio chunks after the file has been finalized.")};return Ct(gr);})();
 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 582f269..a52e4a9 100644
--- a/build/mp4-muxer.min.mjs
+++ b/build/mp4-muxer.min.mjs
@@ -1,4 +1,4 @@
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g("stss",0,0,[u(e.length),e.map(([r])=>u(r+1))])},Lt=t=>g("stsc",0,0,[u(t.compactlyCodedChunkTable.length),t.compactlyCodedChunkTable.map(e=>[u(e.firstChunk),u(e.samplesPerChunk),u(1)])]),jt=t=>g("stsz",0,0,[u(0),u(t.samples.length),t.samples.map(e=>u(e.size))]),$t=t=>t.finalizedChunks.length>0&&Q(t.finalizedChunks).offset>=2**32?g("co64",0,0,[u(t.finalizedChunks.length),t.finalizedChunks.map(e=>R(e.offset))]):g("stco",0,0,[u(t.finalizedChunks.length),t.finalizedChunks.map(e=>u(e.offset))]),Ht=t=>g("ctts",0,0,[u(t.compositionTimeOffsetTable.length),t.compositionTimeOffsetTable.map(e=>[u(e.sampleCount),u(e.sampleCompositionTimeOffset)])]),Wt=t=>y("mvex",null,t.map(qt)),qt=t=>g("trex",0,0,[u(t.id),u(1),u(0),u(0),u(0)]),He=(t,e)=>y("moof",null,[Xt(t),...e.map(Gt)]),Xt=t=>g("mfhd",0,0,[u(t)]),it=t=>{let e=0,r=0,s=0,n=0,o=t.type==="delta";return r|=+o,o?e|=1:e|=2,e<<24|r<<16|s<<8|n},Gt=t=>y("traf",null,[Zt(t),Kt(t),Qt(t)]),Zt=t=>{let e=0;e|=8,e|=16,e|=32,e|=131072;let r=t.currentChunk.samples[1]??t.currentChunk.samples[0],s={duration:r.timescaleUnitsToNextSample,size:r.size,flags:it(r)};return g("tfhd",0,e,[u(t.id),u(s.duration),u(s.size),u(s.flags)])},Kt=t=>g("tfdt",1,0,[R(B(t.currentChunk.startTimestamp,t.timescale))]),Qt=t=>{let e=t.currentChunk.samples.map(D=>D.timescaleUnitsToNextSample),r=t.currentChunk.samples.map(D=>D.size),s=t.currentChunk.samples.map(it),n=t.currentChunk.samples.map(D=>B(D.presentationTimestamp-D.decodeTimestamp,t.timescale)),o=new Set(e),a=new Set(r),l=new Set(s),m=new Set(n),T=l.size===2&&s[0]!==s[1],v=o.size>1,L=a.size>1,ie=!T&&l.size>1,Qe=m.size>1||[...m].some(D=>D!==0),j=0;return j|=1,j|=4*+T,j|=256*+v,j|=512*+L,j|=1024*+ie,j|=2048*+Qe,g("trun",1,j,[u(t.currentChunk.samples.length),u(t.currentChunk.offset-t.currentChunk.moofOffset||0),T?u(s[0]):[],t.currentChunk.samples.map((D,we)=>[v?u(e[we]):[],L?u(r[we]):[],ie?u(s[we]):[],Qe?et(n[we]):[]])])},st=t=>y("mfra",null,[...t.map(Yt),Jt()]),Yt=(t,e)=>g("tfra",1,0,[u(t.id),u(63),u(t.finalizedChunks.length),t.finalizedChunks.map(s=>[R(B(s.startTimestamp,t.timescale)),R(s.moofOffset),u(e+1),u(1),u(1)])]),Jt=()=>g("mfro",0,0,[u(0)]),er={avc:"avc1",hevc:"hvc1",vp9:"vp09",av1:"av01"},tr={avc:It,hevc:Dt,vp9:Mt,av1:Rt},rr={aac:"mp4a",opus:"Opus"},ir={aac:_t,opus:Nt};var sr=Symbol("isTarget"),H=class{};sr;var ne=class extends H{constructor(){super(...arguments);this.buffer=null}},W=class extends H{constructor(r){super();this.options=r;if(typeof r!="object")throw new TypeError("StreamTarget requires an options object to be passed to its constructor.");if(r.onData){if(typeof r.onData!="function")throw new TypeError("options.onData, when provided, must be a function.");if(r.onData.length<2)throw new TypeError("options.onData, when provided, must be a function that takes in at least two arguments (data and position). 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xe=1e3,ar=["avc","hevc","vp9","av1"],ur=["aac","opus"],lr=2082844800,dr=["strict","offset","cross-track-offset"],d,h,be,A,x,S,X,G,Ue,F,P,te,Ie,at,De,ut,Me,lt,Re,dt,Ve,ht,Te,Ge,U,M,_e,ft,re,ze,ge,Ze,Z,ce,Ce,Ke,Xe=class{constructor(e){f(this,Ie);f(this,De);f(this,Me);f(this,Re);f(this,Ve);f(this,Te);f(this,U);f(this,_e);f(this,re);f(this,ge);f(this,Z);f(this,Ce);f(this,d,void 0);f(this,h,void 0);f(this,be,void 0);f(this,A,void 0);f(this,x,null);f(this,S,null);f(this,X,Math.floor(Date.now()/1e3)+lr);f(this,G,[]);f(this,Ue,1);f(this,F,[]);f(this,P,[]);f(this,te,!1);if(p(this,Ie,at).call(this,e),e.video=K(e.video),e.audio=K(e.audio),e.fastStart=K(e.fastStart),this.target=e.target,C(this,d,{firstTimestampBehavior:"strict",...e}),e.target instanceof ne)C(this,h,new Ae(e.target));else if(e.target instanceof W)C(this,h,e.target.options?.chunked?new le(e.target):new ue(e.target));else if(e.target instanceof oe)C(this,h,new Ee(e.target));else throw new Error(`Invalid target: 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a=p(this,Te,Ge).call(this,i(this,S),e,r,s,n,o);if(i(this,d).fastStart==="fragmented"&&i(this,x)){for(;i(this,F).length>0&&i(this,F)[0].decodeTimestamp<=a.decodeTimestamp;){let l=i(this,F).shift();p(this,U,M).call(this,i(this,x),l)}a.decodeTimestamp<=i(this,x).lastDecodeTimestamp?p(this,U,M).call(this,i(this,S),a):i(this,P).push(a)}else p(this,U,M).call(this,i(this,S),a)}finalize(){if(i(this,te))throw new Error("Cannot finalize a muxer more than once.");if(i(this,d).fastStart==="fragmented"){for(let r of i(this,F))p(this,U,M).call(this,i(this,x),r);for(let r of i(this,P))p(this,U,M).call(this,i(this,S),r);p(this,ge,Ze).call(this,!1)}else i(this,x)&&p(this,re,ze).call(this,i(this,x)),i(this,S)&&p(this,re,ze).call(this,i(this,S));let e=[i(this,x),i(this,S)].filter(Boolean);if(i(this,d).fastStart==="in-memory"){let r;for(let n=0;n<2;n++){let o=se(e,i(this,X)),a=i(this,h).measureBox(o);r=i(this,h).measureBox(i(this,A));let l=i(this,h).pos+a+r;for(let m of 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WeakMap,P=new WeakMap,te=new WeakMap,Ie=new WeakSet,at=function(e){if(typeof e!="object")throw new TypeError("The muxer requires an options object to be passed to its constructor.");if(!(e.target instanceof H))throw new TypeError("The target must be provided and an instance of Target.");if(e.video){if(!ar.includes(e.video.codec))throw new TypeError(`Unsupported video codec: ${e.video.codec}`);if(!Number.isInteger(e.video.width)||e.video.width<=0)throw new TypeError(`Invalid video width: ${e.video.width}. 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Must be a positive integer.`);if(!Number.isInteger(e.audio.sampleRate)||e.audio.sampleRate<=0)throw new TypeError(`Invalid audio sample rate: ${e.audio.sampleRate}. Must be a positive integer.`)}if(e.firstTimestampBehavior&&!dr.includes(e.firstTimestampBehavior))throw new TypeError(`Invalid first timestamp behavior: ${e.firstTimestampBehavior}`);if(typeof e.fastStart=="object"){if(e.video){if(e.fastStart.expectedVideoChunks===void 0)throw new TypeError("'fastStart' is an object but is missing property 'expectedVideoChunks'.");if(!Number.isInteger(e.fastStart.expectedVideoChunks)||e.fastStart.expectedVideoChunks<0)throw new TypeError("'expectedVideoChunks' must be a non-negative integer.")}if(e.audio){if(e.fastStart.expectedAudioChunks===void 0)throw new TypeError("'fastStart' is an object but is missing property 'expectedAudioChunks'.");if(!Number.isInteger(e.fastStart.expectedAudioChunks)||e.fastStart.expectedAudioChunks<0)throw new TypeError("'expectedAudioChunks' must be a non-negative integer.")}}else if(![!1,"in-memory","fragmented"].includes(e.fastStart))throw new TypeError("'fastStart' option must be false, 'in-memory', 'fragmented' or an object.")},De=new WeakSet,ut=function(){if(i(this,h).writeBox(tt({holdsAvc:i(this,d).video?.codec==="avc",fragmented:i(this,d).fastStart==="fragmented"})),C(this,be,i(this,h).pos),i(this,d).fastStart==="in-memory")C(this,A,ve(!1));else if(i(this,d).fastStart!=="fragmented"){if(typeof i(this,d).fastStart=="object"){let e=p(this,Me,lt).call(this);i(this,h).seek(i(this,h).pos+e)}C(this,A,ve(!0)),i(this,h).writeBox(i(this,A))}p(this,Z,ce).call(this)},Me=new WeakSet,lt=function(){if(typeof i(this,d).fastStart!="object")return;let e=0,r=[i(this,d).fastStart.expectedVideoChunks,i(this,d).fastStart.expectedAudioChunks];for(let s of r)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},Re=new WeakSet,dt=function(){if(i(this,d).video&&C(this,x,{id:1,info:{type:"video",codec:i(this,d).video.codec,width:i(this,d).video.width,height:i(this,d).video.height,rotation:i(this,d).video.rotation??0,decoderConfig:null},timescale:i(this,d).video.frameRate??57600,samples:[],finalizedChunks:[],currentChunk:null,firstDecodeTimestamp:void 0,lastDecodeTimestamp:-1,timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,compactlyCodedChunkTable:[]}),i(this,d).audio&&(C(this,S,{id:i(this,d).video?2:1,info:{type:"audio",codec:i(this,d).audio.codec,numberOfChannels:i(this,d).audio.numberOfChannels,sampleRate:i(this,d).audio.sampleRate,decoderConfig:null},timescale:i(this,d).audio.sampleRate,samples:[],finalizedChunks:[],currentChunk:null,firstDecodeTimestamp:void 0,lastDecodeTimestamp:-1,timeToSampleTable:[],compositionTimeOffsetTable:[],lastTimescaleUnits:null,lastSample:null,compactlyCodedChunkTable:[]}),i(this,d).audio.codec==="aac")){let e=p(this,Ve,ht).call(this,2,i(this,d).audio.sampleRate,i(this,d).audio.numberOfChannels);i(this,S).info.decoderConfig={codec:i(this,d).audio.codec,description:e,numberOfChannels:i(this,d).audio.numberOfChannels,sampleRate:i(this,d).audio.sampleRate}}},Ve=new WeakSet,ht=function(e,r,s){let o=[96e3,88200,64e3,48e3,44100,32e3,24e3,22050,16e3,12e3,11025,8e3,7350].indexOf(r),a=s,l="";l+=e.toString(2).padStart(5,"0"),l+=o.toString(2).padStart(4,"0"),o===15&&(l+=r.toString(2).padStart(24,"0")),l+=a.toString(2).padStart(4,"0");let m=Math.ceil(l.length/8)*8;l=l.padEnd(m,"0");let T=new Uint8Array(l.length/8);for(let v=0;v<l.length;v+=8)T[v/8]=parseInt(l.slice(v,v+8),2);return T},Te=new WeakSet,Ge=function(e,r,s,n,o,a,l){let m=n/1e6,T=(n-(l??0))/1e6,v=o/1e6,L=p(this,_e,ft).call(this,m,T,e);return m=L.presentationTimestamp,T=L.decodeTimestamp,a?.decoderConfig&&(e.info.decoderConfig===null?e.info.decoderConfig=a.decoderConfig:Object.assign(e.info.decoderConfig,a.decoderConfig)),{presentationTimestamp:m,decodeTimestamp:T,duration:v,data:r,size:r.byteLength,type:s,timescaleUnitsToNextSample:B(v,e.timescale)}},U=new WeakSet,M=function(e,r){i(this,d).fastStart!=="fragmented"&&e.samples.push(r);let s=B(r.presentationTimestamp-r.decodeTimestamp,e.timescale);if(e.lastTimescaleUnits!==null){let o=B(r.decodeTimestamp,e.timescale,!1),a=Math.round(o-e.lastTimescaleUnits);if(e.lastTimescaleUnits+=a,e.lastSample.timescaleUnitsToNextSample=a,i(this,d).fastStart!=="fragmented"){let l=Q(e.timeToSampleTable);l.sampleCount===1?(l.sampleDelta=a,l.sampleCount++):l.sampleDelta===a?l.sampleCount++:(l.sampleCount--,e.timeToSampleTable.push({sampleCount:2,sampleDelta:a}));let m=Q(e.compositionTimeOffsetTable);m.sampleCompositionTimeOffset===s?m.sampleCount++:e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:s})}}else e.lastTimescaleUnits=0,i(this,d).fastStart!=="fragmented"&&(e.timeToSampleTable.push({sampleCount:1,sampleDelta:B(r.duration,e.timescale)}),e.compositionTimeOffsetTable.push({sampleCount:1,sampleCompositionTimeOffset:s}));e.lastSample=r;let n=!1;if(!e.currentChunk)n=!0;else{let o=r.presentationTimestamp-e.currentChunk.startTimestamp;if(i(this,d).fastStart==="fragmented"){let a=i(this,x)??i(this,S);e===a&&r.type==="key"&&o>=1&&(n=!0,p(this,ge,Ze).call(this))}else n=o>=.5}n&&(e.currentChunk&&p(this,re,ze).call(this,e),e.currentChunk={startTimestamp:r.presentationTimestamp,samples:[]}),e.currentChunk.samples.push(r)},_e=new WeakSet,ft=function(e,r,s){let n=i(this,d).firstTimestampBehavior==="strict",o=s.lastDecodeTimestamp===-1;if(n&&o&&r!==0)throw new Error(`The first chunk for your media track must have a timestamp of 0 (received DTS=${r}).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(r(this,h).firstTimestampBehavior==="offset"||r(this,h).firstTimestampBehavior==="cross-track-offset"){s.firstDecodeTimestamp===void 0&&(s.firstDecodeTimestamp=t);let l;r(this,h).firstTimestampBehavior==="offset"?l=s.firstDecodeTimestamp:l=Math.min(r(this,x)?.firstDecodeTimestamp??1/0,r(this,S)?.firstDecodeTimestamp??1/0),t-=l,e-=l}if(t<s.lastDecodeTimestamp)throw new Error(`Timestamps must be monotonically increasing (DTS went from ${s.lastDecodeTimestamp*1e6} to ${t*1e6}).`);return s.lastDecodeTimestamp=t,{presentationTimestamp:e,decodeTimestamp:t}},ie=new WeakSet,Oe=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,G).push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||Q(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,d).pos;for(let t of e.currentChunk.samples)r(this,d).write(t.data),t.data=null;p(this,Z,ce).call(this)}},ge=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 t=[r(this,x),r(this,S)].filter(m=>m&&m.currentChunk);if(t.length===0)return;let s=Ye(this,Ue)._++;if(s===1){let m=se(t,r(this,X),!0);r(this,d).writeBox(m)}let n=r(this,d).pos,o=He(s,t);r(this,d).writeBox(o);{let m=ve(!1),b=0;for(let P of t)for(let re of P.currentChunk.samples)b+=re.size;let v=r(this,d).measureBox(m)+b;v>=2**32&&(m.largeSize=!0,v=r(this,d).measureBox(m)+b),m.size=v,r(this,d).writeBox(m)}for(let m of t){m.currentChunk.offset=r(this,d).pos,m.currentChunk.moofOffset=n;for(let b of m.currentChunk.samples)r(this,d).write(b.data),b.data=null}let a=r(this,d).pos;r(this,d).seek(r(this,d).offsets.get(o));let l=He(s,t);r(this,d).writeBox(l),r(this,d).seek(a);for(let m of t)m.finalizedChunks.push(m.currentChunk),r(this,G).push(m.currentChunk),m.currentChunk=null;e&&p(this,Z,ce).call(this)},Z=new WeakSet,ce=function(){r(this,d)instanceof ue&&r(this,d).flush()},we=new WeakSet,Ke=function(){if(r(this,te))throw new Error("Cannot add new video or audio chunks after the file has been finalized.")};export{ne as ArrayBufferTarget,oe as FileSystemWritableFileStreamTarget,Xe as Muxer,W as StreamTarget};
+`);if(i(this,d).firstTimestampBehavior==="offset"||i(this,d).firstTimestampBehavior==="cross-track-offset"){s.firstDecodeTimestamp===void 0&&(s.firstDecodeTimestamp=r);let l;i(this,d).firstTimestampBehavior==="offset"?l=s.firstDecodeTimestamp:l=Math.min(i(this,x)?.firstDecodeTimestamp??1/0,i(this,S)?.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}},re=new WeakSet,ze=function(e){if(i(this,d).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,G).push(e.currentChunk),(e.compactlyCodedChunkTable.length===0||Q(e.compactlyCodedChunkTable).samplesPerChunk!==e.currentChunk.samples.length)&&e.compactlyCodedChunkTable.push({firstChunk:e.finalizedChunks.length,samplesPerChunk:e.currentChunk.samples.length}),i(this,d).fastStart==="in-memory"){e.currentChunk.offset=0;return}e.currentChunk.offset=i(this,h).pos;for(let r of e.currentChunk.samples)i(this,h).write(r.data),r.data=null;p(this,Z,ce).call(this)}},ge=new WeakSet,Ze=function(e=!0){if(i(this,d).fastStart!=="fragmented")throw new Error("Can't finalize a fragment unless 'fastStart' is set to 'fragmented'.");let r=[i(this,x),i(this,S)].filter(m=>m&&m.currentChunk);if(r.length===0)return;let s=Ye(this,Ue)._++;if(s===1){let m=se(r,i(this,X),!0);i(this,h).writeBox(m)}let n=i(this,h).pos,o=He(s,r);i(this,h).writeBox(o);{let m=ve(!1),T=0;for(let L of r)for(let ie of L.currentChunk.samples)T+=ie.size;let v=i(this,h).measureBox(m)+T;v>=2**32&&(m.largeSize=!0,v=i(this,h).measureBox(m)+T),m.size=v,i(this,h).writeBox(m)}for(let m of r){m.currentChunk.offset=i(this,h).pos,m.currentChunk.moofOffset=n;for(let T of m.currentChunk.samples)i(this,h).write(T.data),T.data=null}let a=i(this,h).pos;i(this,h).seek(i(this,h).offsets.get(o));let l=He(s,r);i(this,h).writeBox(l),i(this,h).seek(a);for(let m of r)m.finalizedChunks.push(m.currentChunk),i(this,G).push(m.currentChunk),m.currentChunk=null;e&&p(this,Z,ce).call(this)},Z=new WeakSet,ce=function(){i(this,h)instanceof ue&&i(this,h).flush()},Ce=new WeakSet,Ke=function(){if(i(this,te))throw new Error("Cannot add new video or audio chunks after the file has been finalized.")};export{ne as ArrayBufferTarget,oe as FileSystemWritableFileStreamTarget,Xe as Muxer,W as StreamTarget};
diff --git a/build/mp4-muxer.mjs b/build/mp4-muxer.mjs
index 79e8a70..3f3f4bb 100644
--- a/build/mp4-muxer.mjs
+++ b/build/mp4-muxer.mjs
@@ -387,7 +387,46 @@ var videoSampleDescription = (compressionType, track) => box(compressionType, [
   i16(65535)
   // Pre-defined
 ], [
-  VIDEO_CODEC_TO_CONFIGURATION_BOX[track.info.codec](track)
+  VIDEO_CODEC_TO_CONFIGURATION_BOX[track.info.codec](track),
+  track.info.decoderConfig.colorSpace ? colr(track) : null
+]);
+var COLOR_PRIMARIES_MAP = {
+  "bt709": 1,
+  // ITU-R BT.709
+  "bt470bg": 5,
+  // ITU-R BT.470BG
+  "smpte170m": 6
+  // ITU-R BT.601 525 - SMPTE 170M
+};
+var TRANSFER_CHARACTERISTICS_MAP = {
+  "bt709": 1,
+  // ITU-R BT.709
+  "smpte170m": 6,
+  // SMPTE 170M
+  "iec61966-2-1": 13
+  // IEC 61966-2-1
+};
+var MATRIX_COEFFICIENTS_MAP = {
+  "rgb": 0,
+  // Identity
+  "bt709": 1,
+  // ITU-R BT.709
+  "bt470bg": 5,
+  // ITU-R BT.470BG
+  "smpte170m": 6
+  // SMPTE 170M
+};
+var colr = (track) => box("colr", [
+  ascii("nclx"),
+  // Colour type
+  u16(COLOR_PRIMARIES_MAP[track.info.decoderConfig.colorSpace.primaries]),
+  // Colour primaries
+  u16(TRANSFER_CHARACTERISTICS_MAP[track.info.decoderConfig.colorSpace.transfer]),
+  // Transfer characteristics
+  u16(MATRIX_COEFFICIENTS_MAP[track.info.decoderConfig.colorSpace.matrix]),
+  // Matrix coefficients
+  u8((track.info.decoderConfig.colorSpace.fullRange ? 1 : 0) << 7)
+  // Full range flag
 ]);
 var avcC = (track) => track.info.decoderConfig && box("avcC", [
   // For AVC, description is an AVCDecoderConfigurationRecord, so nothing else to do here
diff --git a/package.json b/package.json
index ff7469a..2c2bc1e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mp4-muxer",
-  "version": "5.1.3",
+  "version": "5.1.4",
   "description": "MP4 multiplexer in pure TypeScript with support for WebCodecs API, video & audio.",
   "main": "./build/mp4-muxer.js",
   "module": "./build/mp4-muxer.mjs",
diff --git a/src/box.ts b/src/box.ts
index 008bbc7..4609657 100644
--- a/src/box.ts
+++ b/src/box.ts
@@ -329,7 +329,39 @@ export const videoSampleDescription = (
 	u16(0x0018), // Depth
 	i16(0xffff) // Pre-defined
 ], [
-	VIDEO_CODEC_TO_CONFIGURATION_BOX[track.info.codec](track)
+	VIDEO_CODEC_TO_CONFIGURATION_BOX[track.info.codec](track),
+	track.info.decoderConfig.colorSpace ? colr(track) : null
+]);
+
+// These maps are taken from https://www.matroska.org/technical/elements.html,
+// which references the tables in ITU-T H.273 - they should apply here.
+
+const COLOR_PRIMARIES_MAP: Record<VideoColorPrimaries, number> = {
+	'bt709': 1,     // ITU-R BT.709
+	'bt470bg': 5,   // ITU-R BT.470BG
+	'smpte170m': 6  // ITU-R BT.601 525 - SMPTE 170M
+};
+
+const TRANSFER_CHARACTERISTICS_MAP: Record<VideoTransferCharacteristics, number> = {
+	'bt709': 1,          // ITU-R BT.709
+	'smpte170m': 6,      // SMPTE 170M
+	'iec61966-2-1': 13   // IEC 61966-2-1
+};
+
+const MATRIX_COEFFICIENTS_MAP: Record<VideoMatrixCoefficients, number> = {
+	'rgb': 0,       // Identity
+	'bt709': 1,     // ITU-R BT.709
+	'bt470bg': 5,   // ITU-R BT.470BG
+	'smpte170m': 6  // SMPTE 170M
+};
+
+/** Colour Information Box: Specifies the colour space of the video. */
+export const colr = (track: VideoTrack) => box('colr', [
+	ascii('nclx'), // Colour type
+	u16(COLOR_PRIMARIES_MAP[track.info.decoderConfig.colorSpace.primaries]), // Colour primaries
+	u16(TRANSFER_CHARACTERISTICS_MAP[track.info.decoderConfig.colorSpace.transfer]), // Transfer characteristics
+	u16(MATRIX_COEFFICIENTS_MAP[track.info.decoderConfig.colorSpace.matrix]), // Matrix coefficients
+	u8((track.info.decoderConfig.colorSpace.fullRange ? 1 : 0) << 7) // Full range flag
 ]);
 
 /** AVC Configuration Box: Provides additional information to the decoder. */