+ def _download_json(self, url_or_request, video_id,
+ note=u'Downloading JSON metadata',
+ errnote=u'Unable to download JSON metadata',
+ transform_source=None):
+ json_string = self._download_webpage(url_or_request, video_id, note, errnote)
+ if transform_source:
+ json_string = transform_source(json_string)
+ try:
+ return json.loads(json_string)
+ except ValueError as ve:
+ raise ExtractorError('Failed to download JSON', cause=ve)
+