ofVideoGrabber on RaspberryPi: Gstreamer trouble. No video capture.

The videoGrabberExample and any other ofVideoGrabber in connection with a USB Webcam is non-functional. It shows only a black or white camera image if the Video is >160x120px.

With any other Webcam software the camera is working fine, even at Full HD.

As it seems to me, it uses a gstreamer pipe? Is this maybe the problem?

[notice ] ofGstUtils: setPipelineWithSink(): gstreamer pipeline: v4l2src name=video_source device=/dev/video0 ! video/x-raw,format=RGB,width=160,height=120,framerate=30/1 ! appsink name=ofappsink caps="video/x-raw, format=RGB, width=160, height=120" <-- works

but with anything above 160x120px, it doesnt.

I tried with "examples/video/videoGrabberExample" and my own code.

More debug info:

[notice ] ofAppEGLWindow: setupRPiNativeWindow(): screenRect: 1680x1050
[notice ] ofAppEGLWindow: setupRPiNativeWindow(): windowRect: 1024x768
[notice ] ofAppEGLWindow: createSurface(): setting up EGL Display
[notice ] ofAppEGLWindow: createSurface(): EGL Display correctly set
[notice ] ofAppEGLWindow: createSurface(): current renderer type: GL
[notice ] ofAppEGLWindow: createSurface(): default renderer detected
[notice ] ofAppEGLWindow: createSurface(): surface created correctly
[notice ] ofAppEGLWindow: createSurface(): API bound correctly
[notice ] ofAppEGLWindow: createSurface(): -----EGL-----
[notice ] ofAppEGLWindow: createSurface(): EGL_VERSION_MAJOR = 1
[notice ] ofAppEGLWindow: createSurface(): EGL_VERSION_MINOR = 4
[notice ] ofAppEGLWindow: createSurface(): EGL_CLIENT_APIS = OpenGL_ES OpenVG
[notice ] ofAppEGLWindow: createSurface(): EGL_VENDOR = Broadcom
[notice ] ofAppEGLWindow: createSurface(): EGL_VERSION = 1.4
[notice ] ofAppEGLWindow: createSurface(): EGL_EXTENSIONS = EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_vg_parent_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_lock_surface 
[notice ] ofAppEGLWindow: createSurface(): GL_RENDERER = VideoCore IV HW
[notice ] ofAppEGLWindow: createSurface(): GL_VERSION  = OpenGL ES-CM 1.1
[notice ] ofAppEGLWindow: createSurface(): GL_VENDOR   = Broadcom
[notice ] ofAppEGLWindow: createSurface(): -------------
[notice ] ofAppEGLWindow: setupPeripherals(): peripheral setup complete
[notice ] ofAppEGLWindow: setupNativeUDev(): created udev object
[notice ] ofAppEGLWindow: setupMouse(): unabled to find mouse
[ error ] ofAppEGLWindow: setupMouse(): did not open mouse
[ error ] ofAppEGLWindow: setupMouse(): did not open mouse, mouse_fd < 0
[warning] ofAppEGLWindow: setupKeyboard(): unabled to find keyboard
[ error ] ofAppEGLWindow: setupKeyboard(): did not open keyboard
[ error ] ofAppEGLWindow: setupKeyboard(): did not open keyboard, keyboard_fd < 0
[notice ] ofAppEGLWindow: setupPeripherals(): native event setup complete
[notice ] ofAppEGLWindow: setupOpenGL(): peripheral setup complete
[notice ] ofAppEGLWindow: runAppViaInfiniteLoop(): entering infinite loop
[notice ] probing devices with udev...
[notice ] found device 046d:0821, getting capabilities...
[notice ] detected v4l2 device: UVC Camera (046d:0821)
[notice ] driver: uvcvideo, version: 199205
[notice ] capabilities: 0x84000001
[notice ] found device 046d:0821, getting capabilities...
[notice ] detected v4l2 device: UVC Camera (046d:0821)
[notice ] driver: uvcvideo, version: 199205
[notice ] capabilities: 0x84000001
0: UVC Camera (046d:0821)
1: UVC Camera (046d:0821)
[notice ] ofGstVideoGrabber: initGrabber(): selected device: UVC Camera (046d:0821)
[notice ] ofGstVideoGrabber: initGrabber(): selected format: 640x480 video/x-raw RGB framerate: 24/1
[notice ] ofGstUtils: setPipelineWithSink(): gstreamer pipeline: v4l2src name=video_source device=/dev/video0 ! video/x-raw,format=RGB,width=640,height=480,framerate=24/1    ! appsink name=ofappsink caps="video/x-raw, format=RGB, width=640, height=480"
[notice ] ofAppEGLWindow: runAppViaInfiniteLoop(): setting up notifications complete
^C[notice ] ofAppEGLWindow: destroyNativeKeyboard()
[notice ] ofAppEGLWindow: destroyNativeKeyboard(): unable to reset terminal
[notice ] ofAppEGLWindow: destroySurface(): destroying EGL surface
libv4l2: warning v4l2 mmap buffers still mapped on close()

(videoGrabberExample:8355): GStreamer-CRITICAL **: gst_mini_object_unref: assertion `mini_object->refcount > 0' failed

Start with examples/video/videoGrabberExample on the Raspberry Pi and USB webcam, then inspect the pipeline logged by ofGstUtils for 160x120 versus 640x480 capture. Reproduce the black or white image at a resolution above 160x120 and verify that video capture works at the selected 640x480 format.