I looked through all of this again. And I’m starting to think we should start by not reinventing the wheel, so I’d suggest following the standard release guidelines as much as possible. See a draft below.
For video broadcasts on TV, it looks to me like there’s no reason at all to treat them any differently from non-video broadcasts. This includes videos being originally released on TV, which is fairly equivalent to music being originally played on radio before its official release. As such, rather than making changes for this on the video guidelines, I’d expect the broadcast guideline to be expanded in the future if needed to better deal with this kind of thing.
I would probably expect the actual release to be the VHS or whatnot, if known (same as we’d do with a radio promo CD), and to involve a lot of “leave the date blank” and “leave the format blank” for cases where the data just isn’t available. Known dates of first broadcasts could potentially always be stored with the new-ish label-recording broadcast relationship?
Release date
Follow the usual release guidelines. This means the release date for a digital release of a video should generally be the earliest the video was made available to stream or purchase on any digital platform (see also When to add multiple releases below). For TV broadcasts, follow the broadcast program guidelines.
Medium format
Follow the usual release guidelines. For TV broadcasts, follow the broadcast program guidelines.
When to add multiple releases
Follow the usual release guidelines, but do not create different releases for different thumbnails for the same video on different digital platforms.