Slightly restructure code

.gitignore

@@ -2,7 +2,7 @@ node_modules
 /dist
 /dist-docs
 .DS_Store
-.vitepress/cache
+docs/.vitepress/cache
 /docs/api
 *.tsbuildinfo
 

dev/demux.html

@@ -18,7 +18,7 @@
 		});
 
 		const track = await input.getPrimaryVideoTrack();
-		console.log(await track.computeFrameRateMetrics());
+		console.log(await track.getDecoderConfig());
 
 		/*
 

src/isobmff/isobmff-demuxer.ts

@@ -1387,23 +1387,31 @@ export class IsobmffDemuxer extends Demuxer {
 
 			case 'avcC': {
 				const track = this.currentTrack;
-				if (!track || boxInfo.contentSize === 0) {
+				if (!track) {
-					// FFmpeg will sometimes generate an empty avcC chunk if provided no headers
 					break;
 				}
 				assert(track.info);
 
+				if (boxInfo.contentSize === 0) {
+					// avcC box is empty, let's treat this like an Annex B stream
+					break;
+				}
+
 				track.info.codecDescription = readBytes(slice, boxInfo.contentSize);
 			}; break;
 
 			case 'hvcC': {
 				const track = this.currentTrack;
-				if (!track || boxInfo.contentSize === 0) {
+				if (!track) {
-					// FFmpeg will sometimes generate an empty hvcC chunk if provided no headers
 					break;
 				}
 				assert(track.info);
 
+				if (boxInfo.contentSize === 0) {
+					// hvcC box is empty, let's treat this like an Annex B stream
+					break;
+				}
+
 				track.info.codecDescription = readBytes(slice, boxInfo.contentSize);
 			}; break;