How to check video for duplication?

B

BonBon Slick2018-12-24 08:45:40

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BonBon Slick, 2018-12-24 08:45:40

The second video is loading, how can I find out if there is a similar one on the server?
If there is, there is a 90%+ chance of canceling the download. php is used.

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Alexander, 2018-12-24
@BonBonSlick

1. calculate CRC32 and compare - this is the easiest if another file is sent.
2. compare keyframes by resizing them in 64x64 (for speed)