Example: The film "Addiction" produced in 2018 by PBS. Available online and through Films on Demand.
If accessed through Films on Demand:
PBS (Producer). (2018). Addiction [Video]. Films on Demand.
If accessed online:
Nova. (2018). Addiction [Video]. PBS. https://www.pbs.org/wgbh/nova/video/addiction/
Segments from videos are created and titled by Films on Demand, making the segmenting proprietary. For this reason, format your reference to mention the segment and the database, Films on Demand.
PBS (Producer). (2018). Addiction Neuroscience [Video segment of Addiction]. Films on Demand.