In most cases these are equivalent: cvlc test.mp4 cat test.mp4 | cvlc - However when I create a video using the new libcamera app for Raspberry pi (https://www.raspberrypi.com/documentation/computers/camera_software.html#rpicam-vid) rpicam-vid -t 10s -o test.h264 Then cvlc test.h264 (Works!) cat tes...