$ videolectures-dl -t http://videolectures.net/mackay_course_02/
[download] Title: Lecture 2: Entropy and Data Compression (I): Introduction to Compression, Informa
tion Theory and Entropy - VideoLectures.NET
ERROR: no video information is extracted.
Traceback (most recent call last):
File "./videolectures-dl", line 204, in <module>
main(get_args())
File "./videolectures-dl", line 200, in main
dl.get_video(args.video_url)
File "./videolectures-dl", line 155, in get_video
self.ie_error('ERROR: no video information is extracted.')
File "./videolectures-dl", line 110, in ie_error
raise ExtractionError(mesg)
__main__.ExtractionError: ERROR: no video information is extracted.
http://videolectures.net/mackay_course_02/
Thanks!