ext_ord)
formats = sorted(formats, key=_free_formats_key)
- info_dict['formats'] = formats
+ if formats[0] is not info_dict:
+ # only set the 'formats' fields if the original info_dict list them
+ # otherwise we end up with a circular reference, the first (and unique)
+ # element in the 'formats' field in info_dict is info_dict itself,
+ # wich can't be exported to json
+ info_dict['formats'] = formats
if self.params.get('listformats', None):
self.list_formats(info_dict)
return