Viewing - timvideos/litex-buildenv GitHub Wiki
Before starting USB streaming, press the reset button once.
mplayer -tv device=/dev/video0 tv://
vlc -vvv --color v4l:///dev/video0
To check the frame rate of HDMI2USB you can use guvcviewer.
guvcview --device=/dev/video1 --show_fps=1 --size=1024X768
The frame rate will appear in the title bar of the new window.