[YouTube] Tier 2 age-gate bypass implementation

[MinePlayersPE]

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Implements #574 (comment) (tier-2 age-gate bypass).

[pukkandan]

An update of the current situation for reference:

There are 3 tiers of age-gate

1. Embeddable such as HtVdAasjOgU works using both the embed and this new method
2. Some non-embeddable videos like Tq92D6wQ1mg, SkRSXFQerZs doesn't work with embed method, but does with this new one
3. Some doesn't work with either method XgnwCQzjau8 Cr381pDsSsA, rR8s72aouNE - Not sure why

tier 3 videos did not used to work with the old get_video_info endpoint either

There doesn't seem to be any video that works in embed workaround but fails using this new method. So embed-workaround is mostly redundant rn and is kept around only in case this method breaks

There are also some non-agegated videos like tf2U5Vyj0oU which works normally, but doesn't work with clientScreen=EMBED. These do however work if we add a thirdParty={'embedUrl': any_valid_url} to the context. It is not clear if there are any normal videos that doesn't work even with this MeJVWBSsPAY however doesnt work even with this. So we'll continue using 2 seperate requests for age-gated and normal videos

Edit:
tier 2.5. HsUATh_Nc2U works with this only if thirdParty is set and is therefore not covered by this PR. Will be implemented in #577 (5dcbfdc)

[nicolaasjan]

Some doesn't work with either method XgnwCQzjau8 Cr381pDsSsA, rR8s72aouNE - Not sure why

It looks like it may depend on your location.
E.g rR8s72aouNE can be downloaded from Canada.

[pukkandan]

There are also some non-agegated videos like tf2U5Vyj0oU which works normally, but doesn't work with clientScreen=EMBED. These do however work if we add a thirdParty={'embedUrl': any_valid_url} to the context.

MeJVWBSsPAY works normally, but fails with clientScreen, and fails with thirdParty too.

thanks

E.g rR8s72aouNE can be downloaded from Canada.

works from United States as well:

POST /youtubei/v1/player HTTP/1.1
Host: [www.youtube.com](http://www.youtube.com)
Authorization: Bearer ya29.a0ARrdaM947JTxOLapm4m6ULw1kwRbc_pdQXCsifKJ-5pICHKdC...

{"context":{"client":{"clientName":"ANDROID","clientVersion":"16.05"}},
"racyCheckOk":true,"videoId":"rR8s72aouNE"}

You are using ouath though?

[pukkandan]

This request works with cookies, looks like same as its always been

exactly. we are talking about unauthenticated access - like I told you before in the other post

[RealDeviil]

Hello, I have been monitoring this pull request and fork, and I have not yet had a chance to test it. But I will ASAP.

@89z I think it is clear that you can download any video, age-gated or not, with a valid login cookie file (or OAuth). youtube-dl even lets you pass in a cookie file that you can read from and write to, via:

--cookies FILE File to read cookies from and dump
cookie jar in

The challenge is to avoid authentication, if possible. (I.e., avoid generating and maintaining a login cookie file.) The need for authentication introduces additional problems/challenges in some use cases (at least, it does for me) -- so it is worth exploring an alternative that accommodates anonymous access.

At the end of the day, if there is no practical solution to download all or at least the majority of age-gated videos without auth, then so be it -- I will resort to using authentication.

[MinePlayersPE]

For a more complete (and arguably less messy) overview of the situation, here are the age-gate tiers turned to embedding tiers:

1. Videos such as HtVdAasjOgU, WomAGoEh-Ss (both age-gated) and 95% of other videos can be embedded normally (and are unaffected by the other tiers).
2. Videos such as HsUATh_Nc2U (age-gated, affected by tier 3) and tf2U5Vyj0oU (not age-gated) can only be embedded on a public site (i.e. with a domain) due to music restrictions. context => thirdParty => embedUrl must be set to a URL for embedding to work
3. Videos like Tq92D6wQ1mg, SkRSXFQerZs cannot be embedded (only) because of age-gating. They can be embedded with non-embedded client + clientScreen=EMBED though (which also bypasses age-gating)
4. Videos like Cr381pDsSsA (age-gated) or MeJVWBSsPAY (not age-gated) has embedding disabled by the creator. They cannot be embedded at all

EDIT: Swapped tier 2 and 3