Bob.bio.video is meant to be used as a wrapper class
When you have an extractor that works on one image like quality measures, you can use bob.bio.video to make it work on a video. This is explained in
bob.bio.video's documentation: https://www.idiap.ch/software/bob/docs/bob/bob.bio.video/stable/implementation.html . Also @mguenther who have implemented this can explain this better.
But the way it is used in https://gitlab.idiap.ch/bob/bob.pad.face/blob/b0a14393f109e8bc15928ade60b0614e34e4b73f/bob/pad/face/extractor/VideoQualityMeasure.py#L25 is just a re-write of
This is true also for
VideoLBPHistogram at least.