[FFmpeg-user] Create a live video stream from a single image file

[Weydson Lima]

I'm trying to create a live video stream from a single image. Once this 
image gets overwritten, a new video frame would then be created 
otherwise the last image would be used as the current video frame.

Is there a way to accomplish that using the ffmpeg command line? I was 
thinking about something like this pseudo code:

cat -forever source.jpg | ffmpeg -i pipe:0 udp://127.0.0.1:3333?listen

Thank you