How to expand video to full screen?

Question

linux

Good day. OC - ​​ubuntu
There is a command
ffmpeg -re -i pipe:0 -map 0:v -f opengl 'test' -map 0:a -f pulse default
or equivalent ffmpeg -re -i /home/test.mp4 -map 0: v -f opengl 'test' -map 0:a -f pulse default
Two questions.

1. How to make the playback window in fullscreen? Right now, full screen, but windowed mode
2. Apply a watermark (logo) to the video

Answer 1

Here , look