Hi. Why would you use netcat on the same device?
That part of the solution is to provide "paused" network traffic from a remote device.
./ffmpeg -i tj.mp4 -pix_fmt gray -f rawvideo -s 800x450 -|./raw2gmv | ./gmplay would be the correct solution. IF it worked on one device. As far as I remember it doesn't work on one device. A blank screen is outputted.
With regards to your ACTUAL setup. you said. /mnt/us/nc -l 5555 so that would be port 5555 so the other bit would be nc localhost 5555
It's kind of early in the morning here but that would maybe be the wrong end of the socket you identified or something, not awake properly.
HTH
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