How to get the video id.
1. Youtube
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In the address bar, the word between "?v=" and "&" is the video id.
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Or you can click the share.
The word after "be/" is the video id.
2. Bilibili
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In the address bar, the word after "video/" is the video id.
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Or you can use the Bilibili mobile app.
The word here is the video id.