diff --git a/hls-player.js b/hls-player.js
index c83deca..18f4f39 100644
--- a/hls-player.js
+++ b/hls-player.js
@@ -6,6 +6,7 @@ class PlaylistLoader {
 		this.last_segment = null;
 		this.refresh_interval = null;
 		this.new_segments = [];
+		this.init_segment_uri = null;
 		this.fetch_playlist();
 	}
 
@@ -32,6 +33,8 @@ class PlaylistLoader {
 			if (lines[i].startsWith("#")) {
 				if (lines[i].startsWith("EXT-X-TARGETDURATION", 1)) {
 					this.refresh_interval = parseFloat(lines[i].split(':')[1]);
+				} else if (lines[i].startsWith("EXT-X-MAP:URI", 1)) {
+					this.init_segment_uri = lines[i].split('=')[1].slice(1, -1);
 				}
 			} else {
 				if (segment_block_flag || lines[i] == '') {
@@ -73,7 +76,10 @@ class VideoLoader {
 	async prepare_buffer(_) {
 		// fetch init.mp4 fragment and parse its mimetype
 		// codec info is needed for MediaSource compat
-		let init_frag = await this.fetch_video('/vid/' + this.stream_key + '/init.mp4');
+		while (this.playlist_loader.init_segment_uri === null) {
+			await new Promise(r => setTimeout(r, 250));
+		}
+		let init_frag = await this.fetch_video(this.playlist_loader.init_segment_uri);
 		let mime = (new MP4Tree(init_frag)).get_mime();
 		if (!MediaSource.isTypeSupported(mime)) {
 			return;
@@ -101,7 +107,7 @@ class VideoLoader {
 
 	async resync_video() {
 		if (!this.media_buffer.updating) {
-			const buffer_end = this.media_buffer.buffered.end(0);
+			let buffer_end = this.media_buffer.buffered.end(0);
 			// if video is over 15s behind, seek to 5s behind current end.
 			// not called on loop, only once on start
 			if (buffer_end - this.player.currentTime > 15) {
diff --git a/mp4-tree.js b/mp4-tree.js
index 065d4b4..aca5f40 100644
--- a/mp4-tree.js
+++ b/mp4-tree.js
@@ -96,35 +96,36 @@ class MP4Tree {
 	}
 
 	parse_av01() {
-		this.parse_into('av01', 101);
+		this.parse_into('av01', 86);
 		this.parse_into('av1C', 8);
 		let tmp = this.data.getUint8(this.idx + 1);
 		let profile = tmp >> 5;
 		let level = tmp & 0x1f;
-		let tmp = this.data.getUint8(this.idx + 2);
+		let level_profile, bit_depth;
+		tmp = this.data.getUint8(this.idx + 2);
 		switch (tmp >> 7) {
 			case 0:
-				let level_profile = "M";
+				level_profile = "M";
 				break;
 			case 1:
-				let level_profile = "H";
+				level_profile = "H";
 				break;
 			default:
-				let level_profile = "";
+				level_profile = "";
 		}
 		let depth_bits = (tmp >> 5) & 0x3;
 		switch (depth_bits) {
 			case 0:
-				let bit_depth = "8";
+				bit_depth = "08";
 				break;
 			case 1:
-				let bit_depth = "12";
+				bit_depth = "12";
 				break;
 			case 2:
-				let bit_depth = "10";
+				bit_depth = "10";
 				break;
 			default:
-				let bit_depth = "0";
+				bit_depth = "0";
 				break;
 		}
 		this.codecs.push(["av01", profile, level.toString().padStart(2, "0") + level_profile, bit_depth].join('.'))