I have some troubles while extracting frames from video stream such as Netflix, …

I have some troubles while extracting frames from video stream such as Netflix, 7plus, …
I’ve used canvas and createStream() (From Javascript) API but when I capture a frame from video and turn into base64 string, it become black screen
I see Netflix videos using DRM (Digital Rights Management) technologies to prevent the browser from accessing the video content directly. So it’s quite hard to capture a frame image from any platform using DRM.
Do you guys have any ideas how can I capture those frames via Client side (Javascript) or maybe Server side?
Thanks for any help!