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are the different ioctl commands for video output, does anyone know when these are called? Specifically the VIDIOC_S_OUTPUT ioctl case. During bootup this is called but I am not sure what exact application does this.
try to reference the kernel source tree Documentation/video4linux/v4lgrab.c
maybe help for you.the ioctl is used to get some capablities and attributes of video card when initializing the device and user's process
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When do the video4linux ioctls are called?
