This is the 1978 BBC mini series "The Voyage of Charles Darwin"
about the life and theories of Darwin. It consists of seven 1-hour
episodes.
It was directed by Martyn Friend, produced by Christoper Ralling,
written by Robert Raid, and stars Malcom Stoddard as Darwin. See
http://www.imdb.com/title/tt0216517/
It comes to you via TV, VHS and YouTube, so the quality is limited.
Video codec: XVID (MPEG-4 ASP, plays fine with VLC or ffdshow)
Audio codec: MPGA (MP2)
You can also watch the show in 10-minute segments on YouTube or in
1-hour segments on Veoh.