How to get all comments on a YouTube video?

Question

Since Google has deprecated the YouTube v2 API, I cannot find a way to get all the comments from a video.

Is it possible to use a single, non-deprecated API (Google+

Answer 1

Apparently it is now possible to fetch comment threads.

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(old answer)

Currently that's impossible with a first-party tool.

Source:

While v3 offers the majority of v2 functionality, there are currently a couple of tasks that can only be done with the older API. Specifically, applications that manage captions or that work with video comments still need to use the v2 API until modern equivalents are available. Our goal is to provide similar functionality well before the April 2015 shut-off date—please subscribe to this blog, the YouTube Data API v3 revision history page, or follow +YouTubeDev on Google+ to keep up-to-date. - http://apiblog.youtube.com/2014/03/committing-to-youtube-data-api-v3.html

TubeKit (YouTube crawling toolkit) might be of help to some.