I cannot recommend Techmoan's videos enough. He usually reviews past video and audio formats, some of them are really niche products. Really interesting!
He does spend some time getting around to the point though doesn’t he? This ends up being 40 minutes of video and if you’re just interested in the Hi-Vision part it could probably be 10 minutes. He spends a lot of time talking about the timeline of various video formats, goes over repairing his machine, etc. The interesting part is maybe the last 5 minutes of this video and then the 2nd part.
He's not an engineer that I know of so his videos lean on the history side more, and I am fine with that. The context he puts into his videos really helps you understand the "whys" of the tech.
