Fix incomplete parsing and generation of AacAudioSpecificConfig (fixes #471)

dev/demux.html

@@ -17,8 +17,13 @@
 			source: new Mediabunny.BlobSource(file),
 		});
 
-		const track = await input.getPrimaryVideoTrack();
-		console.log(await track.getDecoderConfig());
+		const track = await input.getPrimaryAudioTrack();
+		const sink = new Mediabunny.AudioSampleSink(track);
+
+		for await (const sample of sink.samples()) {
+			console.log(sample);
+			sample.close()
+		}
 
 		/*