When do the video4linux ioctls are called?
 

Hello,

In the linux 2.6.29 source file

drivers/media/video/v4l2-ioctl.c

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.

Thanks!

It is used in libvo (MPlayer) for instance.

Hard to say what runs it during your bootup, however.

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