[Prankcast] Fix extractor and add live chat

[columndeeply]

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Description of your pull request and other information

This PR fixes the old extractor and adds support for live chat downloading.

I'm not sure if I'm doing it correctly but it's saving the subtitles file as ".live_chat.unknown_video"... Not sure what that means... The contents of the chat JSON are saved correctly so that part seems to work.

I also wanted to add livestream support but couldn't figure out how to. If anybody could point me to an existing extractor that supports both livestreams and non-live media (and is simpler than the YouTube one... I was following that but no luck...) I'd appreciate it. If I end up figuring it out I'll make a new PR with that feature.

Fixes #

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[seproDev]

You should not break the old URLs, which still work.

You can specify the ext for the live chat to be saved as json.

[columndeeply]

Added the ext, it's saving them as "live_chat.json" now.

The /showreel/ URLs have been deprecated for a while. They are no longer accessible directly from the site, all links now point to the /posts/ path. It's missing a few of the fields I'm using on the new extractor as well.

I can try to add support for /showreel/ back but I'm not sure whats the point of keeping them around...

[seproDev]

Since there are also ID collisions (Old 6217, New 6217) I'd say it would probably best if you just create a new extractor. PrankCastIE stays the old extractor for showreel links and PrankCastPostIE can be your current code to deal with the new posts links.

[columndeeply]

Done, I've added the PrankCastPostIE for the new URLs

[bashonly]

If anybody could point me to an existing extractor that supports both livestreams and non-live media

EttuTvIE is a very simple example of 1 extractor supporting both. Read about the is_live and live_status info dict fields in the InfoExtractor docstring. However, if the livestreams have a different URL format than non-live posts, it could be better for them to be handled in their own extractor. The Kick extractors are good simple examples of separate VOD vs live extractors

[columndeeply]

EttuTvIE is a very simple example of 1 extractor supporting both. Read about the is_live and live_status info dict fields in the InfoExtractor docstring. However, if the livestreams have a different URL format than non-live posts, it could be better for them to be handled in their own extractor. The Kick extractors are good simple examples of separate VOD vs live extractors

Thanks! I'll check those out and see if I end up figuring it out. I'll probably push that feature as a new PR tho, I won't be able to work on the live extractor for a while.