How do some big factories realize video compression on the network disk?

We often upload videos to Baidu or115 and other online disks, and we can watch videos online, and the original videos played on their websites are compressed. Here, I would like to ask you:

  1. what tools do most of these big factories use to convert to video formats that can be viewed online?
  2. if there is a similar open source tool, can you share the corresponding tool name?

thx

Video-transcoding video-processing
Mar.06,2021

ffmpeg can handle most compression and transcoding needs

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