How to transcode video from Pipe with ffmpeg?

Question

bash

There is a program that outputs video to stdout h264 (let's say even cat file.h264), but the question is how to encode this file via ffmpeg directly from the command line in real time from stdout, I tried to write something like cat file.h264|ffmpeg -i pipe:0 file.mp4 gives no result

Answer 1

So have you tried it?
cat file.h264 | ffmpeg -i - file.mp4