Introduction - If you have any usage issues, please Google them yourself
In FC4, it can show the usb camera video capture and display the current time, I wrote it myself, has been verified through.
Packet : 87361045qt v4l-capture.rar filelist
qt+v4l视频采集\qt_v4l.cpp
qt+v4l视频采集\qt_v4l.h
qt+v4l视频采集