[lynda] Extract all prioritized streams

youtube_dl/extractor/lynda.py

@@ -140,12 +140,13 @@ class LyndaIE(LyndaBaseIE):
 
         prioritized_streams = video_json.get('PrioritizedStreams')
         if prioritized_streams:
+            for prioritized_stream_id, prioritized_stream in prioritized_streams.items():
                 formats.extend([
                     {
                         'url': video_url,
                         'width': int_or_none(format_id),
-                    'format_id': format_id,
+                        'format_id': '%s-%s' % (prioritized_stream_id, format_id),
-                } for format_id, video_url in prioritized_streams['0'].items()
+                    } for format_id, video_url in prioritized_stream.items()
                 ])
 
         self._check_formats(formats, video_id)