On some reddit.com subpages, which focus heavily on video content, ( like reddit.com/videos for example ) the links which are beeing posted, always show thumbnails of the videos, in some cases the videos come from various types of sources.
I am wondering how they are doing this. I know that bigger services like Youtube offer APIs, which make that a rather easy task, but in other cases, when an API is not available, it is not that clear to me.
The only thing I could find researching, where services which offer thumbnails for URLs, but those where just screenshots of the full webpage, instead of video thumbnails.
So my Question basically is:
How to gather video thumbnails, from video links, when there is no API available
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