QtAV/doc/UsingPipe.md

FFmpeg supports playing media streams from pipe. Pipe is a protocol in FFmpeg. To use it, you just need to replace the file name with 'pipe:'. for example

cat hello.avi |player pipe:

It also supports streams from file number

pipe:number

'number' can be 0, 1, 2, .... 0 is stdin, 1 is stdout and 2 is stderr. If 'number' is empty, it means stdin.

FFmpeg is powerful, do you think so?