[playback] restore manifest_type property for version of Kodi prior t…

…o 21

plugin.video.amazon-test/resources/lib/playback.py

@@ -396,6 +396,8 @@ def _IStreamPlayback(asin, name, streamtype, isAdult, extern):
         Log('Using %s Version: %s' % (_g.is_addon, is_version))
 
         listitem = xbmcgui.ListItem(label=title, path=mpd)
+        if (_g.KodiVersion < 21) and ('adaptive' in _g.is_addon):
+            listitem.setProperty('inputstream.adaptive.manifest_type', 'mpd')
         listitem.setArt({'thumb': thumb})
         listitem.setSubtitles(subs)
         listitem.setProperty('%s.license_type' % _g.is_addon, 'com.widevine.alpha')