Hi all, I have just added qvidcap to v4l-utils. It is a utility that I've been working on for a long time. For the past 2 years or so I was stuck on Qt/OpenGL issues and without time to dig into it. I want to thank my colleague Bård Eirik for fixing those issues. The core purpose is to display uncompressed video using OpenGL/OpenGL ES. It can read from V4L2 video nodes, from a network socket, from a file or using the built-in test pattern generator. To use the network functionality you start qvidcap with the -p option. And on the device elsewhere on the network you run: v4l2-ctl --stream-mmap --stream-to-host <hostname> It will now stream video (run-length-encoded, so poor compression unless you are streaming a test pattern) to the host that is running qvidcap and you can see what the video looks like. Very useful when dealing with embedded systems that do not yet have working video output. When qvidcap reads from a file you can also dynamically change the resolution and pixelformat (i.e. how it interprets the data). Again, very useful for debugging. Changing colorspace, transfer functions, etc. is always possible (right-click to see a menu appear). There are two display modes: either the video is scaled to the window, or the video is never scaled and you get scrollbars if the video is larger than the window. By default qvidcap uses OpenGL, but with the --opengles option you can select OpenGL ES. Future planned work: 1) Allow changing resolution/pixelformat for streaming over the network as well. 2) Re-use the opengl(es) code for qv4l2 as it is much cleaner code. 3) Use the vicodec codec for the network streaming code as a second option besides the run-length encoding. qvidcap has been tested on nvidia (both the nvidia and nouveau drivers), amd (amdgpu driver), intel i915 and vmware GPU drivers. I expect virtualbox to work fine as well. Enjoy! Hans
