Rewrite reader logic, add separate reader for caching MP4 chunks, add more advanced drain iterators

dev/demux.html

@@ -27,13 +27,11 @@
         const context = canvas.getContext('2d');
 
         // Top-level for await loop inside the event listener
-        for await (const frame of drain.frames(await videoTrack.getDuration() - 10)) {
+        for await (const frame of drain.frames()) {
             context.drawImage(frame, 0, 0, width, height);
             frame.close();
         }
 
-		console.log("Here??")
-
 		/*
 		const videoTrack = await input.getPrimaryVideoTrack();
 		const drain = new Metamuxer.VideoFrameDrain(videoTrack);