I see people sharing links to peertube, youtube, streamable, imgur, and other sites in communities in order to share videos. For the non-federated ones, it's understandable if there is no option, but for content creators, is it possible to share a video directly from peertube into a community?

I don't know if it's possible by adding @peertube@lemmy.world for example in the text of a description and then removing it or doing something else.

The goal here is that when sharing the video, the comments on the video are also sent to the video's page. Is that possible?

That would be sick. Peer tube is pretty great

Already exists and works (or at least did work). Check out: !thelinuxexperiment_channel@tilvids.com

That channel was posting to the threadiverse up until a month ago. There are newer videos on it's peertube channel, so not sure what happened, but it was working.

Edit: fixed community name/link.

I guess there is just nobody on your instance (piefed.zip) subscribed to the channel which is why it does not federate.
On piefed.social there is the latest one available (9 days ago) as i myself am subscribed.

Channels on PeerTube are already Communities on here so there is no need to tag something for videos to show up as long as somebody subscribes to the channel. If you search for a specific video on your instance it should show up with comments from across the Fediverse. (e.g.: https://makertube.net/videos/watch/b82221ac-53b2-4b72-94f7-4d1ee436cce1) However you can still crosspost the videos in more specific Communites. Comments are then aggregated from different Posts on Piefed and I think Lemmy 1.0

But crossposting requires an account on the target instance, doesn't it? I can't crosspost on my peertube instance to a community in lemmy/piefed/mastodon/fedia can I?

one thing I really wish the federation had done was work more under a shared login system. something like saml. I would like to click on a peertube link and for it to create a user on the peertube system using any relevant customizations from my parent user and if I modify options on peertube I wish it would save that to my piefed user somewhere. like an other accounts tab or something.

I know you can do it from mastodon, so I suppose you could also do it from lemmy. For example if I want to comment on a peertube video (without having an account on the peertube instance), I just paste the url of the video into my mastodon account's search bar which brings it up in the results as a post, and from there I can Favorite it and/or reply to it. The fav adds 1 to the likes and the reply appears as a comment on the video.

Also from that post I can click on the profile and then Follow so all their video posts from then on will show up in my timeline.

this exists, its called OWA (open web auth) (https://magicsignon.org/page/openwebauth/fep) and is implemented in hubzilla and other softwares of the family.

I'm subscribed to it, so I don't think that's the issue. But interesting that it is federating to other instances.

no I meant by default. So me signing up with in this case pifed.social would have me move over to pifed as hubertmanne@piefed.social without me having to do more than authorize much like a place that will use your google login.

that sounds both a privacy and security nightmare

How so?

I would like to click on a peertube link and for it to create a user on the peertube system using any relevant customizations from my parent user

unauthorized exfiltration of your user data, including all settings, your email address and possibly your subscriptions.
but probably this could be solved with some agreement dialog.

and if I modify options on peertube I wish it would save that to my piefed user somewhere

intransparent and unauthorized modification of arbitrary settings in the origin user

they don't need ot allow that. It just authorizes and would use the username and the tab to keep track of the instances settings. I mean your initial instance would have that but they have that ability to begin with. Anything on the web would be security and privacy risks if not done will. also none of that is very useful unless the person signed up with a main email. again though the fediverse developers have been pretty good at using good practices.

I have been slowely finding a few. The good ones are almost exclusivly youtubers that now also post to peertube

We need to convince more of them to sync / mirror their content on peertube.

just at them?