Add support OPUS audio for MSE/MP4

www/README.md

@@ -56,3 +56,5 @@ pc.ontrack = ev => {
 - https://web.dev/i18n/en/fast-playback-with-preload/#manual_buffering
 - https://developer.mozilla.org/en-US/docs/Web/API/Media_Source_Extensions_API
 - https://chromium.googlesource.com/external/w3c/web-platform-tests/+/refs/heads/master/media-source/mediasource-is-type-supported.html
+- https://googlechrome.github.io/samples/media/sourcebuffer-changetype.html
+- https://chromestatus.com/feature/5100845653819392

www/codecs.html

@@ -53,7 +53,7 @@
     const video = document.createElement("video");
     out.innerText += "video.canPlayType\n";
     types.forEach(type => {
-        out.innerText += type + "=" + (video.canPlayType(type) ? "true" : "false") + "\n";
+        out.innerText += `${type} = ${MediaSource.isTypeSupported(type)} / ${video.canPlayType(type)}\n`;
     })
 
 </script>

www/video-rtc.js

@@ -26,8 +26,7 @@ export class VideoRTC extends HTMLElement {
             "hvc1.1.6.L153.B0", // H.265 main 5.1 (Chromecast Ultra)
             "mp4a.40.2",        // AAC LC
             "mp4a.40.5",        // AAC HE
-            "mp4a.69",          // MP3
-            "mp4a.6B",          // MP3
+            "opus",             // OPUS Chrome
         ];
 
         /**