How to get Captions for videos using YouTube API - youtube-api

Is possible to retrieve (get) captions for a YouTube video (not owned by the user) from the YouTube API?

In v2, you can access only your videos captions.
In v3, there is no support for captions yet, but will be supported soon.
It's a Terms of Service issue, not to provide these captions.

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YouTube API - Fetching playlistItems do not return unlisted items

Using the instructions here, I was able to get a list of all videos on a channel on except videos which are unlisted:
Youtube Api to fetch all videos on a Channel
The YouTube API documentation is not clear on whether I was able to retrieve unlisted channel using the playlistItems request, and this post seems to indicate that the behavior has changed multiple times:
Youtube API returning unlisted videos
Is there any solution on being able to retrieve a full list unlisted videos from the API from the channel? Also, for this specific channel, this API account is connected to the YouTube brand account as a Manager, and I'm not sure whether that changes the behavior of the API.

How to Upload videos to my channel on you tube from android?

Want to upload videos to my channel on youtube directly from android and iOS using youtube API v3.
I know "client login" of Youtube API v2 is now deprecated and cannot use any more now, but is there any method in V3 API that we can use now to achieve the video upload to my channel on youtube without user interaction or without user prompt to ask username or password?
Letting other people upload random videos to your channel is not recommended. That's why OAuth2 only lets them to upload to their own channel. You can use YouTube Direct Lite for people to upload to their channel, but you can still collect those videos into your playlist.
https://code.google.com/p/youtube-direct-lite/
https://github.com/youtube/yt-direct-lite-iOS
https://github.com/youtube/yt-direct-lite-android

How do I mark a video as watched with Youtube API v3?

I have a C# program I wrote using the Youtube API V3 that manages my channel's videos.
I already have all the OAuth 2.0 stuff sorted out and I'm looking for a way to tell Youtube that the authenticated account watched the video.
The reason being that I use the "watched" feature to determine which of the videos in my feed is the last one I actually watched.
Is there a way to do that?
Or is it purposefully not in the API because it messes with the view count?
Of course I checked Google and Google's API reference first, didn't find anything.

Youtube Related Videos using Youtube V3 API

I need the API URL for Youtube Related Videos using the Youtube V3 API.
But I couldn't find the direct API call, like it is in Version 2. Did I miss something?
https://developers.google.com/youtube/v3/docs/
Are you trying to find videos related to a video?
You can use search->list call for this with specifying the "relatedToVideoId"
And for anyone looking for a coded example:
GET https://www.googleapis.com/youtube/v3/search?part=snippet&relatedToVideoId=5rOiW_xY-kc&type=video&key={YOUR_API_KEY}

Can I store the videos in my own server when using the YouTube API?

We are proposing to use the YouTube API for a community video portal. When using the Upload API and the Player API ... I have the following queries ...
Can I store all the videos in my own Server, instead of storing on YouTube?
Will the uploaded videos on my site also appear on youtube.com automatically? Can I restrict the display of our videos on the YouTube site, as these come through a Pay wall?
Are there any restrictions to the number of videos being uploaded using the API?
Rregards

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