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+
You can fetch all the comments using https://www.googleapis.com/youtube/v3/commentThreads
The Youtube API v3.0 allows you the following parameters.
textFormat - This parameter indicates whether the API should return comments formatted as HTML or as plain text. The default value is html.
videoId - The Youtube Video ID you want to fetch comments for ( if you dont know your Youtube Video ID, you can get one from Youtube Video ID Finder )
maxResults - The maxResults parameter specifies the maximum number of items that should be returned in the result set.
pageToken - The pageToken parameter identifies a specific page in the result set that should be returned. In an API response, the nextPageToken property identifies the next page of the result that can be retrieved.