[dispeak] Improve FLV extraction (closes #13513)

youtube_dl/extractor/dispeak.py

@@ -32,6 +32,14 @@ class DigitallySpeakingIE(InfoExtractor):
         # From http://www.gdcvault.com/play/1013700/Advanced-Material
         'url': 'http://sevt.dispeak.com/ubm/gdc/eur10/xml/11256_1282118587281VNIT.xml',
         'only_matching': True,
+    }, {
+        # From https://gdcvault.com/play/1016624
+        'url': 'https://sevt.dispeak.com/ubm/gdc/online12/xml/201210-822101_1349794556671DDDD.xml',
+        'info_dict': {
+            'id': '201210-822101_1349794556671DDDD',
+            'ext': 'flv',
+            'title': 'Pre-launch - Preparing to Take the Plunge',
+        },
     }]
 
     def _parse_mp4(self, metadata):
@@ -84,7 +92,8 @@ class DigitallySpeakingIE(InfoExtractor):
                 'vcodec': 'none',
                 'format_id': audio.get('code'),
             })
-        slide_video_path = xpath_text(metadata, './slideVideo', fatal=True)
+        slide_video_path = xpath_text(metadata, './slideVideo')
+        if slide_video_path:
             formats.append({
                 'url': 'rtmp://%s/ondemand?ovpfv=1.1' % akamai_url,
                 'play_path': remove_end(slide_video_path, '.flv'),
@@ -94,7 +103,8 @@ class DigitallySpeakingIE(InfoExtractor):
                 'preference': -2,
                 'format_id': 'slides',
             })
-        speaker_video_path = xpath_text(metadata, './speakerVideo', fatal=True)
+        speaker_video_path = xpath_text(metadata, './speakerVideo')
+        if speaker_video_path:
             formats.append({
                 'url': 'rtmp://%s/ondemand?ovpfv=1.1' % akamai_url,
                 'play_path': remove_end(speaker_video_path, '.flv'),