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

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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:

what tools do most of these big factories use to convert to video formats that can be viewed online?
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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