diff --git a/youtube_dl/extractor/jwplatform.py b/youtube_dl/extractor/jwplatform.py
index 5d56e0a28..ff7097160 100644
--- a/youtube_dl/extractor/jwplatform.py
+++ b/youtube_dl/extractor/jwplatform.py
@@ -50,7 +50,11 @@ class JWPlatformBaseIE(InfoExtractor):
             # JWPlayer backward compatibility: flattened sources
             # https://github.com/jwplayer/jwplayer/blob/v7.4.3/src/js/playlist/item.js#L29-L35
             if 'sources' not in video_data:
-                video_data['sources'] = [video_data]
+                if isinstance(video_data, list):
+                    video_data = {'sources': video_data }
+                    video_data['tracks'] = video_data['sources'][0].get('tracks')
+                else:
+                    video_data['sources'] = [video_data]
 
             this_video_id = video_id or video_data['mediaid']
 
@@ -78,9 +82,10 @@ class JWPlatformBaseIE(InfoExtractor):
                     height = int_or_none(source.get('height'))
                     if height is None:
                         # Often no height is provided but there is a label in
-                        # format like 1080p.
+                        # format like 1080p or 'SD 480'
                         height = int_or_none(self._search_regex(
-                            r'^(\d{3,})[pP]$', source.get('label') or '',
+                            [r'^(\d{3,})[pP]$', r'^[SH]D (\d{3,})$'],
+                            source.get('label') or '',
                             'height', default=None))
                     a_format = {
                         'url': source_url,