video_url = compat_urllib_parse.unquote(mobj.group(1))
if video_url.startswith('//'):
video_url = compat_urllib_parse_urlparse(url).scheme + ':' + video_url
+ if '://' not in video_url:
+ video_url = url + ('' if url.endswith('/') else '/') + video_url
video_id = os.path.basename(video_url)
# here's a fun little line of code for you: