I want to highlight the one on Film History. Here's the introduction:
It's a playlist, which should continue to the next segment automatically. There are 17 videos so far, with more being added, each under 10 minutes long.
Another option is the Ministry of Cinema Youtube channel's 7-video playlist on Cinema's Birth to Modern Day -Learn Film: A Timeline of World Cinema. Its introduction and overview is here:
and each of the videos is about 10 minutes long.
The Annenberg Learner.org site has a video series on American Cinema available online
"A video instructional series on film history for college and high school classrooms and adult learners; 10 one-hour and 3 half-hour video programs"but I'm unable to embed it here. It can be viewed at their site.
I've seen both the playlists from Youtube but haven't finished the ones from Learner.org as they are longer and are taking a while for me to work my way through. The longer videos include commentary by people involved in the film industry.
I love movies and am trying to see a wide variety from a wide range of genres and time periods. I usually work from lists of "best" films. I won't live long enough to see them all, but I know I'll never run short of viewing material.