[youtube] Show if video is embeddable in info

[pukkandan]

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Description of your pull request and other information

Adds a new key playable_in_embed in youtube.py infodict
Closes #27730

[dstftw]

1. Any new meta field must be documented in extractor/common.
2. In order to keep metadata consistent and predictable we only add general purpose meta fields which may be applicable to wide range of extractors.

[pukkandan]

Any new meta field must be documented in extractor/common.

I can add the documentation, but if it is not going to be merged anyway since it is not "general purpose", then I am not going to bother with it.

[dstftw]

First of, it's not quite clear what's this meta field is about - allowing/not allowing to play in embedded players another sites or what? If so it may be considered generic as many video platforms have such option (e.g. vimeo, livestream).

[pukkandan]

done

[remitamine]

in the case of vimeo, limelight, brightcove, etc..., embed might be restricted by certain conditions.
as an example for vimeo videos, the config would contain embed_permission with values documented in the API documentation.
so in the case of a vimeo that has embed_permission=whitelist, setting the playable_in_embed value to True would give the wrong impression that the video can be embed everywhere, on the other hand setting the value to False is also wrong the video can embeded in certain websites, and for value None, the possibility to embed is known but can't be represented.

[pukkandan]

@remitamine What values do you suggest? Should any string be allowed in addition to True/False?

I am just trying to implement this in youtube.com. I am not really familiar with the other extractors

[remitamine]

What values do you suggest? Should any string be allowed in addition to True/False?

i'm pointing that using a boolean value might not be the right choice(how this would be implemented is up to you and what the review process will lead to).

I am just trying to implement this in youtube.com. I am not really familiar with the other extractors

a general purpose meta field should work with the majority of extractors and not only for a specific extractor(trying to avoid the need in the future to add another fields specific to every extractor which will make it more difficult for third parties to consume the info dict).

[pukkandan]

I have changed the description to

Whether this video is allowed to play in embedded players on other sites. Can be True (=always allowed), False (=never allowed), None (=unknown), or a string specifying the criteria for embeddability (Eg: 'whitelist').

I dont know what else to change it to. If you think it should be needs further modification, please make a review commit

[kr4ssi]

Can it get merged?