ffmpeg

Homepage

https://ffmpeg.org/ 

What is it?

An open-source library for processing and transforming videos.

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.