Hello list,
I am creating an application where I need a webcam to have a static
exposure time per frame so it does no try to compensate the lighting
situation and I can control the lighting myself.
I am using the mjpeg-streamer application to grab images over HTTP,
which works fine btw, very handy tool! I added a few lines in the
input_uvc module so as to turn off auto-exposure, gain and
whitebalance, but no combination of this seems to work.
The following code:
printf("Auto whitebalance: %d\n", v4l2SetControl(vd,
V4L2_CID_WHITE_BALANCE_TEMPERATURE_AUTO, 0));
printf("Auto exposure: %d\n", v4l2SetControl(vd,
V4L2_CID_EXPOSURE_AUTO, 0));
printf("Auto gain: %d\n", v4l2SetControl(vd, V4L2_CID_AUTOGAIN,
0));
results in:
contol White Balance Temperature, Auto unsupported
Auto whitebalance: -1
Auto exposure: 0
Auto gain: -1
dmesg output:
uvcvideo: Failed to query (1) UVC control 2 (unit 2) : -32 (exp.
2).
uvc module revision 156, device id 046d:08ce,
Am I missing something?
With kind regards,
--
Martijn Houtman
[EMAIL PROTECTED]
+31(0)6-15197925
+31(0)20-6892000
Unc Inc
Jacob van Lennepkade 334 X
1053 NJ Amsterdam
www.uncinc.nl
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