FFmpeg
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What is it?
An open-source library for processing and transforming videos.
Why did we choose it?
It's open source, well maintained, and extremely powerful.
What do we use it for?
Resizing and re-encoding user video uploads. We use FFmpeg inside an AWS Lambda cloud function, where we can resize videos and re-encode them using the x265 encoder, giving a much lower filesize without any loss in quality vs the more common x264 encoder.