Merge pull request #44 from ferishili/issue-43

Fix: null value for array_key_first

classes/local/output_helper.php

@@ -132,12 +132,13 @@ public static function output_episode($ocinstanceid, $episodeid, $modinstanceid,
         echo '<br>';
 
         // Find aspect-ratio if there is only one video track.
-        if (count($data['streams']) === 1) {
+        if (count($data['streams']) === 1 && !empty($data['streams'][0]['sources'])) {
             $sources = $data['streams'][0]['sources'];
             $res = $sources[array_key_first($sources)][0]['res'];
             $resolution = $res['w'] . '/' . $res['h'];
             echo \html_writer::start_div('player-wrapper', ['style' => '--aspect-ratio:' . $resolution]);
         } else {
+            \core\notification::error(get_string('erroremptystreamsources', 'mod_opencast'));
             echo \html_writer::start_div('player-wrapper');
         }
 

lang/en/opencast.php

@@ -34,6 +34,7 @@
 
 $string['episode'] = 'Opencast episode';
 $string['errorfetchingvideo'] = 'There was a problem fetching the video.';
+$string['erroremptystreamsources'] = 'There is no video source available. Please contact your system administrator.';
 
 $string['gridview'] = 'View as grid';