On Thu, 2009-03-12 at 10:49 +0100, Gregor Fuis wrote: > On Thu, Mar 12, 2009 at 10:28 AM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote: > > > >> Hello, > >> > >> Is it possible to disable v4l2-ctl aplication logging into > >> /var/log/messages. > >> I am using it to control and monitor my PVR 150 cards and every time I > >> run v4l2-ctl -d /dev/video0 --log-status all output is logged into > >> /var/log/messages and some other linux log files. > > > > All --log-status does is to tell the driver to show it's status in the > > kernel log for debugging purposes. It cannot and should not be relied upon > > for monitoring/controlling a driver. > > > > What do you need it for anyway? > > I am just monitoring if signal is present on tuner, and what signal > format is detected. > These two lines: > cx25840 1-0044: Video signal: not present > cx25840 1-0044: Detected format: PAL-Nc > I run this every minute and it is really annoying to have all this in > my system logs. > Is it possible to modify v4l2-ctl source to disable system logging? $ v4l2-ctl -d /dev/video0 -T which calls the VIDIOC_G_TUNER ioctl(), can be used to tell you if a signal is present: Tuner: Name : cx18 TV Tuner Capabilities : 62.5 kHz multi-standard stereo lang1 lang2 Frequency range : 44.0 MHz - 958.0 MHz Signal strength/AFC : 0%/-187500 Current audio mode : lang1 Available subchannels: mono Signal strength will be 0% or 100% - both the cx18 driver and the cx25840 driver behave the same in this regard. AFAICT, other than --log-status (the VIDIOC_LOG_STATUS ioctl()) which always writes to the system logs, there is no way for a non-root user to read out the Video standard detected by the CX25843 hardware. That would require a change to the driver(s) and maybe an API change (I'm not sure). Regards, Andy > > Regards, > Gregor -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
