'How does big companies transcode/encode videos so fast?

For example how does Facebook, YouTube, Reddit and many countless sites encode videos so fast? Do they all have in-house solutions? Tools like FFMPEG and Handbrake are alot slower to how they process files.

I had a hard time deciding if this should be posted on the softwareengineering stackexchange then decided stackoverflow seemed more fit for the question.

videoffmpegvideo-processingtranscodinghandbrake


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