Problems in resolution using a Trust Webcam

Question

Hello, I tried to set the resolution of my webcam to the max available (1280x1024), but when I start motion the reolution is first set to 1280x1024 and then to 640x480. The driver is built in the kernel (debian sid) named gspca_sn9c20x. I read that it could be a problem with usb1.1, but I tried it on 3 pcs which support usb 2.0. thanking you in anticipation.

Config file: motion.conf
I only changed the resolution the rest stayed untouched.

when starting motion:
motion
[0] Processing thread 0 - config file /etc/motion/motion.conf
[0] Motion 3.2.11.1 Started
[0] ffmpeg LIBAVCODEC_BUILD 3412993 LIBAVFORMAT_BUILD 3415808
[0] Thread 1 is from /etc/motion/motion.conf
[0] motion-httpd/3.2.11.1 running, accepting connections
[1] Thread 1 started
[0] motion-httpd: waiting for data on port TCP 8081
[1] cap.driver: "sn9c20x"
[1] cap.card: "USB20 Camera    "
[1] cap.bus_info: "usb-0000:00:0d.2-4.4"
[1] cap.capabilities=0x05000001
[1] - VIDEO_CAPTURE
[1] - READWRITE
[1] - STREAMING
[1] Supported palettes:
[1] 0: BA81 (BA81)
[1] 1: S920 (S920)
[1] 2: JPEG (JPEG)
[1] index_format 3 Test palette JPEG (1280x1024)
[1] Adjusting resolution from 1280x1024 to 640x480.
[1] Using palette JPEG (640x480) bytesperlines 960 sizeimage 460800 colorspace 00000007
[1] found control 0x00980900, "Brightness", range 0,255
[1]     "Brightness", default 127, current 127
[1] found control 0x00980901, "Contrast", range 0,255
[1]     "Contrast", default 127, current 127
[1] found control 0x00980902, "Saturation", range 0,255
[1]     "Saturation", default 127, current 127
[1] found control 0x00980903, "Hue", range -180,180
[1]     "Hue", default 0, current 0
[1] found control 0x0098090e, "Red Balance", range 0,127
[1]     "Red Balance", default 40, current 40
[1] found control 0x0098090f, "Blue Balance", range 0,127
[1]     "Blue Balance", default 40, current 40
[1] found control 0x00980910, "Gamma", range 0,255
[1]     "Gamma", default 16, current 16
[1] found control 0x00980911, "Exposure", range 0,6016
[1]     "Exposure", default 51, current 754
[1] found control 0x00980912, "Auto Exposure", range 0,1
[1]     "Auto Exposure", default 1, current 1
[1] found control 0x00980913, "Gain", range 0,28
[1]     "Gain", default 0, current 0
[1] mmap information:
[1] frames=4
[1] 0 length=462848
[1] 1 length=462848
[1] 2 length=462848
[1] 3 length=462848
[1] Using V4L2
[1] Resizing pre_capture buffer to 1 items
[1] Started stream webcam server in port 8080
^C[1] Thread exiting
[1] Calling vid_close() from motion_cleanup
[1] Closing video device /dev/video0

Output of lsusb:
Bus 003 Device 015: ID 0c45:624f Microdia PC Camera (SN9C201 + OV9650)

Environment

Motion version:	3.2.11.1
ffmpeg version:	none
Libraries:	ffmpeg, mysql, postgresql
Server OS:	Debian Sid 2.6.32-3-486

-- KlausKoeck - 12 May 2010

Answer

Motion has nothing to do on this , it's the webcam driver that adjust the size of frame .

[1] Adjusting resolution from 1280x1024 to 640x480.

-- AngelCarpintero - 16 May 2010

I was having a similar problem using a Microsoft vx-6000 (which also uses the sn9c20x driver), and I had some luck changing the Palette to BA81

v4l2_palette 1

Once I did that, it produced 1280x1024 images.

But then I couldn't get brightness controls. (which did work when it used the JPEG palette)

The v4l2_palette value of 1 was the only one that didn't default to JPEG, I guess motion doesn't support the S920 palette?

Thanks

-chuck