pilonpl
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This is an interesting topic btw
Since youtube does not have a limit on video length and video quality when uploading, you often realize that dosens of Petabytes of data are being stored in a way, that it still uses the same compression technology. They cannot just rewamp the entire database to fit for a better solution for compression and storage, since they would have to manage all of the Petabytes worth of data, which would take years