fix(sourceset): ignore blob urls when updating source cache (#5371)

It's possible for us to get a blob url for sourceset, but when we do, we
shouldn't update the source caches with that information.

blob urls can arise when playback is done via Media Source Extension (MSE) such as m3u8 sources with @videojs/http-streaming (VHS).

src/js/player.js

@@ -1291,6 +1291,14 @@ class Player extends Component {
       src = srcObj.src;
       type = srcObj.type;
     }
+
+    // if we are a blob url, don't update the source cache
+    // blob urls can arise when playback is done via Media Source Extension (MSE)
+    // such as m3u8 sources with @videojs/http-streaming (VHS)
+    if (/^blob:/.test(src)) {
+      return;
+    }
+
     // make sure all the caches are set to default values
     // to prevent null checking
     this.cache_.source = this.cache_.source || {};