diff --git a/src/controller/audio-stream-controller.ts b/src/controller/audio-stream-controller.ts
index f3238cec5ae..a546e03efb5 100644
--- a/src/controller/audio-stream-controller.ts
+++ b/src/controller/audio-stream-controller.ts
@@ -452,6 +452,7 @@ class AudioStreamController
       this.switchingTrack = data;
       // main audio track are handled by stream-controller, just do something if switching to alt audio track
       this.state = State.IDLE;
+      this.flushAudioIfNeeded(data);
     } else {
       this.switchingTrack = null;
       this.bufferedTrack = data;
@@ -746,6 +747,11 @@ class AudioStreamController
       if (this.state === State.ENDED) {
         this.state = State.IDLE;
       }
+      const mediaBuffer = this.mediaBuffer || this.media;
+      if (mediaBuffer) {
+        this.afterBufferFlushed(mediaBuffer, type, PlaylistLevelType.AUDIO);
+        this.tick();
+      }
     }
   }
 
@@ -912,8 +918,8 @@ class AudioStreamController
     }
   }
 
-  private completeAudioSwitch(switchingTrack: MediaPlaylist) {
-    const { hls, media, bufferedTrack } = this;
+  private flushAudioIfNeeded(switchingTrack: MediaPlaylist) {
+    const { media, bufferedTrack } = this;
     const bufferedAttributes = bufferedTrack?.attrs;
     const switchAttributes = switchingTrack.attrs;
     if (
@@ -925,7 +931,13 @@ class AudioStreamController
     ) {
       this.log('Switching audio track : flushing all audio');
       super.flushMainBuffer(0, Number.POSITIVE_INFINITY, 'audio');
+      this.bufferedTrack = null;
     }
+  }
+
+  private completeAudioSwitch(switchingTrack: MediaPlaylist) {
+    const { hls } = this;
+    this.flushAudioIfNeeded(switchingTrack);
     this.bufferedTrack = switchingTrack;
     this.switchingTrack = null;
     hls.trigger(Events.AUDIO_TRACK_SWITCHED, { ...switchingTrack });
diff --git a/src/controller/level-controller.ts b/src/controller/level-controller.ts
index f0cbea88016..0bb244575f3 100644
--- a/src/controller/level-controller.ts
+++ b/src/controller/level-controller.ts
@@ -16,7 +16,10 @@ import {
 import { Level } from '../types/level';
 import { Events } from '../events';
 import { ErrorTypes, ErrorDetails } from '../errors';
-import { isCodecSupportedInMp4, getCodecCompatibleName } from '../utils/codecs';
+import {
+  getCodecCompatibleName,
+  areCodecsMediaSourceSupported,
+} from '../utils/codecs';
 import BasePlaylistController from './base-playlist-controller';
 import { PlaylistContextType, PlaylistLevelType } from '../types/loader';
 import type Hls from '../hls';
@@ -175,8 +178,8 @@ export default class LevelController extends BasePlaylistController {
         audioCodecFound ||= !!audioCodec;
         return (
           !unknownCodecs?.length &&
-          (!audioCodec || isCodecSupportedInMp4(audioCodec, 'audio')) &&
-          (!videoCodec || isCodecSupportedInMp4(videoCodec, 'video'))
+          (!audioCodec || areCodecsMediaSourceSupported(audioCodec, 'audio')) &&
+          (!videoCodec || areCodecsMediaSourceSupported(videoCodec, 'video'))
         );
       }
     );
@@ -192,6 +195,11 @@ export default class LevelController extends BasePlaylistController {
       // Dispatch error after MANIFEST_LOADED is done propagating
       Promise.resolve().then(() => {
         if (this.hls) {
+          if (unfilteredLevels.length) {
+            this.warn(
+              `One or more CODECS in variant not supported: "${unfilteredLevels[0].attrs.CODECS}"`
+            );
+          }
           const error = new Error(
             'no level with compatible codecs found in manifest'
           );
@@ -211,7 +219,8 @@ export default class LevelController extends BasePlaylistController {
     if (data.audioTracks) {
       audioTracks = data.audioTracks.filter(
         (track) =>
-          !track.audioCodec || isCodecSupportedInMp4(track.audioCodec, 'audio')
+          !track.audioCodec ||
+          areCodecsMediaSourceSupported(track.audioCodec, 'audio')
       );
       // Assign ids after filtering as array indices by group-id
       assignTrackIdsByGroup(audioTracks);
diff --git a/src/controller/stream-controller.ts b/src/controller/stream-controller.ts
index 22dc18d67cf..0bf2624a1a6 100644
--- a/src/controller/stream-controller.ts
+++ b/src/controller/stream-controller.ts
@@ -967,6 +967,7 @@ export default class StreamController
           ? this.videoBuffer
           : this.mediaBuffer) || this.media;
       this.afterBufferFlushed(mediaBuffer, type, PlaylistLevelType.MAIN);
+      this.tick();
     }
   }
 
diff --git a/src/loader/m3u8-parser.ts b/src/loader/m3u8-parser.ts
index 2cc2a998d33..2ecf9368d66 100644
--- a/src/loader/m3u8-parser.ts
+++ b/src/loader/m3u8-parser.ts
@@ -809,19 +809,13 @@ function parseStartTimeOffset(startAttributes: string): number | null {
   return null;
 }
 
-function setCodecs(codecs: Array<string>, level: LevelParsed) {
+function setCodecs(codecs: string[], level: LevelParsed) {
   ['video', 'audio', 'text'].forEach((type: CodecType) => {
     const filtered = codecs.filter((codec) => isCodecType(codec, type));
     if (filtered.length) {
-      const preferred = filtered.filter((codec) => {
-        return (
-          codec.lastIndexOf('avc1', 0) === 0 ||
-          codec.lastIndexOf('mp4a', 0) === 0
-        );
-      });
-      level[`${type}Codec`] = preferred.length > 0 ? preferred[0] : filtered[0];
-
-      // remove from list
+      // Comma separated list of all codecs for type
+      level[`${type}Codec`] = filtered.join(',');
+      // Remove known codecs so that only unknownCodecs are left after iterating through each type
       codecs = codecs.filter((codec) => filtered.indexOf(codec) === -1);
     }
   });
diff --git a/src/utils/codecs.ts b/src/utils/codecs.ts
index f49074c029f..3f1e4ea20fd 100644
--- a/src/utils/codecs.ts
+++ b/src/utils/codecs.ts
@@ -85,7 +85,16 @@ export function isCodecType(codec: string, type: CodecType): boolean {
   return !!typeCodes && typeCodes[codec.slice(0, 4)] === true;
 }
 
-export function isCodecSupportedInMp4(codec: string, type: CodecType): boolean {
+export function areCodecsMediaSourceSupported(
+  codecs: string,
+  type: CodecType
+): boolean {
+  return !codecs
+    .split(',')
+    .some((codec) => !isCodecMediaSourceSupported(codec, type));
+}
+
+function isCodecMediaSourceSupported(codec: string, type: CodecType): boolean {
   return (
     MediaSource?.isTypeSupported(`${type || 'video'}/mp4;codecs="${codec}"`) ??
     false
@@ -117,7 +126,7 @@ function getCodecCompatibleNameLower(
   }[lowerCaseCodec];
 
   for (let i = 0; i < codecsToCheck.length; i++) {
-    if (isCodecSupportedInMp4(codecsToCheck[i], 'audio')) {
+    if (isCodecMediaSourceSupported(codecsToCheck[i], 'audio')) {
       CODEC_COMPATIBLE_NAMES[lowerCaseCodec] = codecsToCheck[i];
       return codecsToCheck[i];
     }