Counting the number of different faces from a list of video

[KinChan2414]

I'm planning to create a project to use the face recognition to help me to choose the footages from a list of video.

I have a list of footages (over 100 HD video footages from DV camcorder), which I have to play all the video every time to get the best shot for further editing. One of the criteria would be getting as much as faces in the video. I'm just wonder, is it possible to write a batch program to scan all the footages and list out the number of faces appear in each footage?

As far as I know, the face_recognition can locate as much as faces in a frame of the video, but how to count the number of people in the footage by faces, and retrieve the number of different faces appear in the footage?