Error and switch on containerless EC-3

Fixes #4958 in Safari where EC-3 playback is supported, but hls.js ec-3 audio demuxer not implemented

src/demux/audio/ac3-demuxer.ts

@@ -72,11 +72,15 @@ export class AC3Demuxer extends BaseAudioDemuxer {
     if (
       data[offset] === 0x0b &&
       data[offset + 1] === 0x77 &&
-      getId3Timestamp(id3Data) !== undefined &&
-      // check the bsid to confirm ac-3
-      getAudioBSID(data, offset) < 16
+      getId3Timestamp(id3Data) !== undefined
     ) {
-      return true;
+      // check the bsid to confirm ac-3
+      const bsid = getAudioBSID(data, offset);
+      if (bsid < 16) {
+        return true;
+      } else {
+        throw new Error('Containerless ec-3 is not supported');
+      }
     }
     return false;
   }

src/demux/transmuxer.ts

@@ -468,11 +468,15 @@ export default class Transmuxer {
     }
     // probe for content type
     let mux: MuxConfig | undefined;
-    for (let i = 0, len = muxConfig.length; i < len; i++) {
-      if (muxConfig[i].demux?.probe(data, this.logger)) {
-        mux = muxConfig[i];
-        break;
+    try {
+      for (let i = 0, len = muxConfig.length; i < len; i++) {
+        if (muxConfig[i].demux?.probe(data, this.logger)) {
+          mux = muxConfig[i];
+          break;
+        }
       }
+    } catch (error) {
+      return error;
     }
     if (!mux) {
       return new Error('Failed to find demuxer by probing fragment data');