fix(Cast): Incorrect detection of MediaCapabilities on Linux Chromecast

Author: avelad

lib/polyfill/media_capabilities.js

@@ -327,11 +327,18 @@ shaka.polyfill.MediaCapabilities = class {
 
     let displayType = videoConfig.contentType;
     if (videoConfig.width && videoConfig.height) {
-      displayType +=
-          `; width=${videoConfig.width}; height=${videoConfig.height}`;
+      // All Chromecast can support 720p videos
+      if (videoConfig.width > 1280 || videoConfig.height > 720) {
+        displayType +=
+            `; width=${videoConfig.width}; height=${videoConfig.height}`;
+      }
     }
     if (videoConfig.framerate) {
-      displayType += `; framerate=${videoConfig.framerate}`;
+      // All Chromecast can support a framerate of 24, 25 or 30.
+      const framerate = Math.round(videoConfig.framerate);
+      if (framerate < 24 || framerate > 30) {
+        displayType += `; framerate=${videoConfig.framerate}`;
+      }
     }
     if (videoConfig.transferFunction === 'pq') {
       // A "PQ" transfer function indicates this is an HDR-capable stream;