My goal is a script to download captions of youtube videos, multilanguage - mostly songs with lyrics or subtitled talks.
I found that captions can be downloaded only if owner of them or are enabled by third-contribution: Downloading captions always returns a 403
How to search for youtube videos filtering out ones that do not have captions in the specified language, and have third-party contribution enabled for captions?
I could not find a reference in the tutorial:
Workaround
An alternative approach for me may be to search for videos that only have lyrics in the description using API V3, but I haven't found a guide on how to restrict keyword search to description and not whole snippet.
I tried with part=snippet.description
in search list.