Bash script to capture pictures using webcam

Mogli · 04-06-2009, 11:17 AM

Hello H_TeXMeX_H,
I tried to install xdtv but not able to install... I am using FC9, i386.
Can u help me...

H_TeXMeX_H · 04-06-2009, 11:21 AM

I'm not sure I can, unless the package works, then you should try compiling it from source.

Mogli · 04-06-2009, 01:20 PM

I have executed xdtv:

Quote:

[sharath@OS ~]$ xdtv

and result is

Quote:

This is xdtv 2.4.0 running on Linux/i686 (2.6.27.19-78.2.30.fc9.i686).
scandir: No such file or directory
filename = /home/sharath/.xdtv/xdtvrc
Syntax error: "" is not a correct argument of option -mixer_tvchan
Do "man xdtv" to read the complete syntax
[sharath@OS ~]$ xdtv

This is xdtv 2.4.0 running on Linux/i686 (2.6.27.19-78.2.30.fc9.i686).
scandir: No such file or directory
filename = /home/sharath/.xdtv/xdtvrc
X Error of failed request: XF86DGANoDirectVideoMode
Major opcode of failed request: 136 (XFree86-DGA)
Minor opcode of failed request: 1 (XF86DGAGetVideoLL)
Serial number of failed request: 13
Current serial number in output stream: 13
xdtv_v4l-conf had some trouble, trying to continue anyway
xinerama 0: 1440x900+0+0
Warning: Missing charsets in String to FontSet conversion
Warning: Cannot convert string "star" to type Pixmap
wmhooks: netwm detected
wmhooks: netwm state above supported
wmhooks: netwm fullscreen supported
wmhooks: nothing found...
DGA: server=2.0, include=2.0
VidMode: server=2.2, include=2.2
available video mode(s): 1440x900 1024x768 800x600 800x600 700x525 640x512 640x480 640x480 512x384 400x300 320x240
Selected XvImage adaptor with yuyv support: NV17 Video Texture on port 280 (grabdisplay)
No XvVideo port available.
Warning: Cannot convert string "black" to type Pixmap
ioctl VIDIOC_G_FBUF: Invalid argument
classical overlay is disabled*** GRABBER DEVICE TYPE = v4l2
/home/sharath/.xdtv/xdtvrc:4: invalid value for norm: (null)
Warning: Missing charsets in String to FontSet conversion
MMX, SSE, AMD MMX extensions, SSE2, have been detected.
Method mmx
*** AUDIO DEVICE TYPE = alsa
*** MIXER DEVICE TYPE = alsa

You should launch XdTV with the -mixer_tvchan parameter.
Goto the man page to get more informations about that switch.
Your Alsa mixer doesn't propose any of those channels:

Line, PCM, Capture, Aux, Wave Surround
SB Live Analog/Digital Output Jack or Master

Select the good one for your own audio card.
Or use OSS with the -noalsa parameter.

ioctl VIDIOC_S_STD: Invalid argument
VIDIOC_S_FREQUENCY: Invalid argument
ioctl VIDIOC_STREAMON: Invalid argument
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy
ioctl VIDIOC_REQBUFS: Device or resource busy

what can be the problem

Mogli · 04-06-2009, 02:19 PM

Is it possible to capture photos using "gphoto2" from integrated web cam...

Mogli · 04-06-2009, 10:16 PM

After a long research I understood that this problem is because of nvidia graphics card not supporting DGA. If it so how I can get support on nvidia graphics card... Any help is appreciable...

Chris.len · 04-07-2009, 04:14 AM

If it can identify,your computer and your system must be so intelligent!!!!

H_TeXMeX_H · 04-07-2009, 04:31 AM

Post your xorg.conf or relevant parts of it, it might be that xorg is not loading the dga module, for example:

Code:

# This loads the miscellaneous extensions module, and disables
# initialisation of the XFree86-DGA extension within that module.
    SubSection  "extmod"
      Option    "omit xfree86-dga"   # don't initialise the DGA extension
    EndSubSection

Mogli · 04-07-2009, 11:10 AM

xorg.conf content is

Quote:

# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
ModulePath "/usr/lib/xorg/modules/extensions/nvidia"
ModulePath "/usr/lib/xorg/modules"
EndSection

Section "InputDevice"

# keyboard added by rhpxl
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "Monitor"
Identifier "Monitor0"
ModelName "LCD Panel 1440x900"
HorizSync 31.5 - 56.0
VertRefresh 56.0 - 65.0
Option "dpms"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

H_TeXMeX_H · 04-07-2009, 12:36 PM

There doesn't seem to be a module section, but either way you should fix it by running 'nvidia-settings' and having it generate an xorg.conf (to save it to the right place you should be root).

Here's my module section:

Code:

Section "Module"
    Load           "dbe"
    SubSection  "extmod"
    	Option    "omit xfree86-dga"
    EndSubSection
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

You may want to commend out the omit xfree86-dga if that is the problem.

Mogli · 04-11-2009, 10:50 AM

Hello H_TeXMeX_H,
Sorry for late reply.... I have updated my system from fc9 to fc10. Now xawtv is working some what better. But when I am capturing photo using following command.

Quote:

$ streamer -c /dev/video0 -b 65 -o Desktop/out.jpeg

out put is like this.

Quote:

files / video: JPEG (JFIF) / audio: none
libv4lconvert: Error decompressing JPEG: fill_nbits error: need 9 more bits

some time it capturing full photo... but most of the times it is capturing part of the photo.
What can I do??????????????

H_TeXMeX_H · 04-11-2009, 11:09 AM

why -b 65 ? shouldn't it be:

Code:

streamer -c /dev/video0 -b 16 -o outfile.jpeg

You can also try ffmpeg.

Mogli · 04-11-2009, 11:59 AM

what ever it is same problem...
I used above command and uploaded photo taken.

H_TeXMeX_H · 04-11-2009, 01:57 PM

Looks like it only got part of the frame.

I'm not sure what the '-b' option does. Does anyone know. It seems the man page is severely lacking.