Download YouTube, Vimeo and Vine videos almost instantly with the !keepvid command. It’s free too!
Syntax: !keepvid url of video
Example: !keepvid https://youtu.be/mUflS7rXYrQ
Protip: You may need a userscript manager like Tampermonkey (for Chrome) or Greasemonkey (Firefox) to capture certain media files.
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Update on 8/31/2018: It seems !keepvid doesn’t work anymore. If you know of a replacement, please contact me.