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by adrianmonk 2526 days ago
Here's a guess: upload from a browser running on Linux, and create a FUSE filesystem that blocks read() calls until you've generated the video.

I tried it with a named pipe ("mknod /tmp/foo.mp4 p") and it gave me an error, but before the error, the web page blocked during upload, but it showed me the URL that will be used (before I gave it a single byte of data).