fix: Do not assume 1080p Cast devices, some are 720p (#6562)

lib/util/platform.js

@@ -611,27 +611,32 @@ shaka.util.Platform = class {
 
     if (Platform.isChromecast()) {
       // In our tests, the original Chromecast seems to have trouble decoding
-      // above 1080p.  It would be a waste to select a higher res anyway, given
+      // above 1080p. It would be a waste to select a higher res anyway, given
       // that the device only outputs 1080p to begin with.
       // Chromecast has an extension to query the device/display's resolution.
       const hasCanDisplayType = window.cast && cast.__platform__ &&
           cast.__platform__.canDisplayType;
 
-      // Most Chromecasts can do 1080p.
-      maxResolution.width = 1920;
-      maxResolution.height = 1080;
+      // Some hub devices can only do 720p. Default to that.
+      maxResolution.width = 1280;
+      maxResolution.height = 720;
 
       try {
         if (hasCanDisplayType && await cast.__platform__.canDisplayType(
             'video/mp4; codecs="avc1.640028"; width=3840; height=2160')) {
-          // The device and display can both do 4k.  Assume a 4k limit.
+          // The device and display can both do 4k. Assume a 4k limit.
           maxResolution.width = 3840;
           maxResolution.height = 2160;
+        } else if (hasCanDisplayType && await cast.__platform__.canDisplayType(
+            'video/mp4; codecs="avc1.640028"; width=1920; height=1080')) {
+          // Most Chromecasts can do 1080p.
+          maxResolution.width = 1920;
+          maxResolution.height = 1080;
         }
       } catch (error) {
-        // This shouldn't generally happen.  Log the error.
+        // This shouldn't generally happen. Log the error.
         shaka.log.alwaysError('Failed to check canDisplayType:', error);
-        // Now ignore the error and let the 1080p default stand.
+        // Now ignore the error and let the 720p default stand.
       }
     } else if (Platform.isTizen()) {
       maxResolution.width = 1920;