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youtube-transcript-api
This is a python API which allows you to get the transcript/subtitles for a given YouTube video. It also works for automatically generated subtitles and it does not require an API key nor a headless browser, like other selenium based solutions do!
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
from what I can make out, it's using a python api behind the scenes but it's hard-coded to use english. The site you linked seems to be using the Youtube api, so maybe this is something you can do with your own youtube API key?
NOTE:
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Hence, a higher number means a more popular project.