Re: webcam (usb) access under Ubuntu
On 16 avr, 09:41, Berco Beute <[EMAIL PROTECTED]> wrote: > On Apr 15, 11:45 pm, Berco Beute <[EMAIL PROTECTED]> wrote: > > > I've tried reinstalling gstreamer (for windows): > > >http://gstreamer.freedesktop.org/pkg/windows/releases/gstreamer/gstre.. > > > but that didn't help. I get some complaints about 'libgstinterfaces' > > as well... > > To be more precise, when doing an 'import gst' Python shell pops up an > error dialog saying: > > "This application has failed to start because > libgstinterfaces-0.10.dll was not found." > > 2B You need to install gst-plugins-good too -- pierre -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
On Apr 16, 2:26 pm, yoz <[EMAIL PROTECTED]> wrote:
> Berco Beute wrote:
> > I've been trying to access my webcam using Python, but I failed
> > miserably. The camera works fine under Ubuntu (using camora and
> > skype), but I am unable to get WebCamSpy or libfg to access my webcam.
>
> > First I tried webcamspy (http://webcamspy.sourceforge.net/). That
> > requires pySerial and pyParallel, and optionally pyI2C. Runing
> > WebCamSpy results in:
>
> > Exception exceptions.AttributeError: "Parallel instance has no
> > attribute '_fd'" in > > ignored
>
> > This seems to come from importing I2C. The application window opens,
> > but there's an error message:
>
> > NO VIDEO SOURCE FOUND
>
> > Next I tried libfg (http://antonym.org/libfg). I built it, made the
> > Python bindings and installed it. Unfortunately the following:
>
> import fg
> grabber = fg.Grabber()
>
> > results in:
>
> > fg_open(): open video device failed: No such file or directory
>
> > Since the camera works fine in Ubuntu itself my guess is that the
> > problem is with the python libraries (or even likelier, my usage of
> > them). Is there anybody here that was successful in accessing their
> > webcam on linux using Python? Else I have to reside to Windows and
> > VideoCapture (which relies on the win32 api and thus is Windows-only),
> > something I'd rather not do.
>
> > Thanks for any help,
> > 2B
>
> > ===
> > I am uUsing:
> > WebCam: Logitech QuickCam Pro 400
> > Ubuntu
> > Python 2.5
>
> Some time ago I was playing with writing a webcam server under Linux
> using V4L - I found this bit of code which may help (it works for me).
> Obviously it needs X running to work and the associated libs installed.
> Note this is not my code but it was a good starting point for me to work
> from. I can't find a link to the original article but credit to the author.
>
> import pygame
> import Image
> from pygame.locals import *
> import sys
>
> import opencv
> #this is important for capturing/displaying images
> from opencv import highgui
>
> camera = highgui.cvCreateCameraCapture(0)
> def get_image():
> im = highgui.cvQueryFrame(camera)
> #convert Ipl image to PIL image
> return opencv.adaptors.Ipl2PIL(im)
>
> fps = 30.0
> pygame.init()
> window = pygame.display.set_mode((320,240))
> pygame.display.set_caption("WebCam Demo")
> screen = pygame.display.get_surface()
>
> while True:
> events = pygame.event.get()
> for event in events:
> if event.type == QUIT or event.type == KEYDOWN:
> sys.exit(0)
> im = get_image()
> pg_img = pygame.image.frombuffer(im.tostring(), im.size, im.mode)
> screen.blit(pg_img, (0,0))
> pygame.display.flip()
> pygame.time.delay(int(1000 * 1.0/fps))
>
> Best of Luck
> Bgeddy
Thank you! That seems to work under both Linux and windows. The opencv
library is the clue here. I've used the ctypes wrapper for opencv
provided by the first link below, but there are more options.
For future reference here are some relevant links:
http://wwwx.cs.unc.edu/~gb/wp/blog/2007/02/04/python-opencv-wrapper-using-ctypes/
http://opencvlibrary.sourceforge.net/
http://opencvlibrary.sourceforge.net/NoamLewis
http://opencvlibrary.sourceforge.net/PythonInterface
Windows specific:
http://www.instructables.com/id/Using-openCV-1.0-with-python-2.5-in-Windows-XP/
http://dip.sun.ac.za/3Dvision/talks/OpenCV_in_Python_on_Windows.pps
http://opencvlibrary.sourceforge.net/NoamLewis
Thanks for all the help.
2B
--
http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Berco Beute wrote:
> I've been trying to access my webcam using Python, but I failed
> miserably. The camera works fine under Ubuntu (using camora and
> skype), but I am unable to get WebCamSpy or libfg to access my webcam.
>
> First I tried webcamspy (http://webcamspy.sourceforge.net/). That
> requires pySerial and pyParallel, and optionally pyI2C. Runing
> WebCamSpy results in:
>
> Exception exceptions.AttributeError: "Parallel instance has no
> attribute '_fd'" in > ignored
>
> This seems to come from importing I2C. The application window opens,
> but there's an error message:
>
> NO VIDEO SOURCE FOUND
>
> Next I tried libfg (http://antonym.org/libfg). I built it, made the
> Python bindings and installed it. Unfortunately the following:
>
import fg
grabber = fg.Grabber()
>
> results in:
>
> fg_open(): open video device failed: No such file or directory
>
> Since the camera works fine in Ubuntu itself my guess is that the
> problem is with the python libraries (or even likelier, my usage of
> them). Is there anybody here that was successful in accessing their
> webcam on linux using Python? Else I have to reside to Windows and
> VideoCapture (which relies on the win32 api and thus is Windows-only),
> something I'd rather not do.
>
> Thanks for any help,
> 2B
>
> ===
> I am uUsing:
> WebCam: Logitech QuickCam Pro 400
> Ubuntu
> Python 2.5
Some time ago I was playing with writing a webcam server under Linux
using V4L - I found this bit of code which may help (it works for me).
Obviously it needs X running to work and the associated libs installed.
Note this is not my code but it was a good starting point for me to work
from. I can't find a link to the original article but credit to the author.
import pygame
import Image
from pygame.locals import *
import sys
import opencv
#this is important for capturing/displaying images
from opencv import highgui
camera = highgui.cvCreateCameraCapture(0)
def get_image():
im = highgui.cvQueryFrame(camera)
#convert Ipl image to PIL image
return opencv.adaptors.Ipl2PIL(im)
fps = 30.0
pygame.init()
window = pygame.display.set_mode((320,240))
pygame.display.set_caption("WebCam Demo")
screen = pygame.display.get_surface()
while True:
events = pygame.event.get()
for event in events:
if event.type == QUIT or event.type == KEYDOWN:
sys.exit(0)
im = get_image()
pg_img = pygame.image.frombuffer(im.tostring(), im.size, im.mode)
screen.blit(pg_img, (0,0))
pygame.display.flip()
pygame.time.delay(int(1000 * 1.0/fps))
Best of Luck
Bgeddy
--
http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Berco Beute wrote: > On Apr 16, 12:19 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: >> Maybe if you are now using windows, there are better options - but I'm a >> *nix-boy :) >> >> Diez > > So am I :), but the application I'm writing has to run on *that other > operating system from the 90's*. > I'm trying hard not to implement the application in C#/.Net, but I'm > running out of open source alternatives. VideoCapture *almost* worked > and now I'm stranded at the gstreamer road as well... How's that saying? "If your in Rom, do as the Romans do". Don't fight Windows. And take IronPython to mitigate the pain of using it :) Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
On Apr 16, 12:19 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: > Maybe if you are now using windows, there are better options - but I'm a > *nix-boy :) > > Diez So am I :), but the application I'm writing has to run on *that other operating system from the 90's*. I'm trying hard not to implement the application in C#/.Net, but I'm running out of open source alternatives. VideoCapture *almost* worked and now I'm stranded at the gstreamer road as well... 2B -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Berco Beute wrote: > On Apr 15, 11:45 pm, Berco Beute <[EMAIL PROTECTED]> wrote: >> I've tried reinstalling gstreamer (for windows): >> >> http://gstreamer.freedesktop.org/pkg/windows/releases/gstreamer/gstre...http://gstreamer.freedesktop.org/pkg/windows/releases/gstreamer/gstre... >> >> but that didn't help. I get some complaints about 'libgstinterfaces' >> as well... > > To be more precise, when doing an 'import gst' Python shell pops up an > error dialog saying: > > "This application has failed to start because > libgstinterfaces-0.10.dll was not found." I'm sorry, but I really can't comment on gst-installion issues - that all worked for me because of ubuntu. Maybe if you are now using windows, there are better options - but I'm a *nix-boy :) Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
On Apr 15, 11:45 pm, Berco Beute <[EMAIL PROTECTED]> wrote: > I've tried reinstalling gstreamer (for windows): > > http://gstreamer.freedesktop.org/pkg/windows/releases/gstreamer/gstre...http://gstreamer.freedesktop.org/pkg/windows/releases/gstreamer/gstre... > > but that didn't help. I get some complaints about 'libgstinterfaces' > as well... To be more precise, when doing an 'import gst' Python shell pops up an error dialog saying: "This application has failed to start because libgstinterfaces-0.10.dll was not found." 2B -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
On Apr 15, 11:18 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: > Berco Beute schrieb: > > > Thanks, that would be great. > > Here you go. > > http://roggisch.de/vidio.tgz > > Diez Wonderful! Thank you very much! I'm running out of time, but after installing the necessary goodies using the nice package from here: http://aruiz.typepad.com/siliconisland/2006/12/allinone_win32_.html In the meantime I've switched to windows. I'm running into the problem that 'import gst' throws: === >>> import gst Traceback (most recent call last): File "", line 1, in File "H:\Python25\lib\site-packages\gst-0.10\gst\__init__.py", line 87, in from _gst import * ImportError: DLL load failed: The specified module could not be found. === I've tried reinstalling gstreamer (for windows): http://gstreamer.freedesktop.org/pkg/windows/releases/gstreamer/gstreamer-0.10.17.setup.zip http://gstreamer.freedesktop.org/pkg/windows/releases/gstreamer/gstreamer-0.10.17.win32.zip but that didn't help. I get some complaints about 'libgstinterfaces' as well... I'm too unfamiliar with these libraries to have a clue what's wrong here... I'll look into it some more tomorrow. 2B -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Berco Beute schrieb: > Thanks, that would be great. Here you go. http://roggisch.de/vidio.tgz Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Le Tue, 15 Apr 2008 05:21:54 -0700, Berco Beute a écrit : > I've been trying to access my webcam using Python, but I failed > miserably. The camera works fine under Ubuntu (using camora and skype), > but I am unable to get WebCamSpy or libfg to access my webcam. > > First I tried webcamspy (http://webcamspy.sourceforge.net/). That > requires pySerial and pyParallel, and optionally pyI2C. Runing WebCamSpy > results in: > > Exception exceptions.AttributeError: "Parallel instance has no attribute > '_fd'" in > ignored > > This seems to come from importing I2C. The application window opens, but > there's an error message: > > NO VIDEO SOURCE FOUND > > Next I tried libfg (http://antonym.org/libfg). I built it, made the > Python bindings and installed it. Unfortunately the following: > import fg grabber = fg.Grabber() > > results in: > > fg_open(): open video device failed: No such file or directory > > Since the camera works fine in Ubuntu itself my guess is that the > problem is with the python libraries (or even likelier, my usage of > them). Is there anybody here that was successful in accessing their > webcam on linux using Python? Else I have to reside to Windows and > VideoCapture (which relies on the win32 api and thus is Windows-only), > something I'd rather not do. > > Thanks for any help, I dont know if this resolve your problem, but to get snapshots from a camera under linux, using V4L2 API, I wrote a small wrapper around this API. Its called pyvideograb, and its here: http://laurent.pointal.org/python/projets/pyvideograb/index.pih Note: there is no automatic thing in this library, just a wrapper to V4L2, so you must know what options and image format your camera support and use these (you may have to convert image by yourself - see PIL and Numpy for quick data processing functions). To find the supported options you can use xawtv and give it ad-hoc cli option to make it verbose. A+ Laurent. -- Laurent POINTAL - [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Berco Beute wrote: > Thanks, that would be great. > > While I'm at it I wondering how to display a video preview. Here's > someone using VideoCapture (the win32 lib) and PyGame, but I'd rather > use a GUI framework and preview/capture videos directly. gstreamer has a preview window. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Thanks, that would be great. While I'm at it I wondering how to display a video preview. Here's someone using VideoCapture (the win32 lib) and PyGame, but I'd rather use a GUI framework and preview/capture videos directly. 2B > It has been *ages* since I did this - so take it with a grain of salt. > However, back then I was able to access a video camera using gqcam. Looking > into the source of that revealed that all it did were some simple > ioctl-calls and reading from a /dev/video*-device. > > That did the trick for me... > > Additionally, you might consider using gstreamer + the python bindings for > that. I was also successful using them - if I remember this conversation > tonight or so, I'll send you the sources. > > Diez > > Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: webcam (usb) access under Ubuntu
Berco Beute wrote: > I've been trying to access my webcam using Python, but I failed > miserably. The camera works fine under Ubuntu (using camora and > skype), but I am unable to get WebCamSpy or libfg to access my webcam. > > First I tried webcamspy (http://webcamspy.sourceforge.net/). That > requires pySerial and pyParallel, and optionally pyI2C. Runing > WebCamSpy results in: > > Exception exceptions.AttributeError: "Parallel instance has no > attribute '_fd'" in > ignored > > This seems to come from importing I2C. The application window opens, > but there's an error message: > > NO VIDEO SOURCE FOUND > > Next I tried libfg (http://antonym.org/libfg). I built it, made the > Python bindings and installed it. Unfortunately the following: > import fg grabber = fg.Grabber() > > results in: > > fg_open(): open video device failed: No such file or directory > > Since the camera works fine in Ubuntu itself my guess is that the > problem is with the python libraries (or even likelier, my usage of > them). Is there anybody here that was successful in accessing their > webcam on linux using Python? Else I have to reside to Windows and > VideoCapture (which relies on the win32 api and thus is Windows-only), > something I'd rather not do. It has been *ages* since I did this - so take it with a grain of salt. However, back then I was able to access a video camera using gqcam. Looking into the source of that revealed that all it did were some simple ioctl-calls and reading from a /dev/video*-device. That did the trick for me... Additionally, you might consider using gstreamer + the python bindings for that. I was also successful using them - if I remember this conversation tonight or so, I'll send you the sources. Diez Diez -- http://mail.python.org/mailman/listinfo/python-list
webcam (usb) access under Ubuntu
I've been trying to access my webcam using Python, but I failed miserably. The camera works fine under Ubuntu (using camora and skype), but I am unable to get WebCamSpy or libfg to access my webcam. First I tried webcamspy (http://webcamspy.sourceforge.net/). That requires pySerial and pyParallel, and optionally pyI2C. Runing WebCamSpy results in: Exception exceptions.AttributeError: "Parallel instance has no attribute '_fd'" in > ignored This seems to come from importing I2C. The application window opens, but there's an error message: NO VIDEO SOURCE FOUND Next I tried libfg (http://antonym.org/libfg). I built it, made the Python bindings and installed it. Unfortunately the following: >>>import fg >>>grabber = fg.Grabber() results in: fg_open(): open video device failed: No such file or directory Since the camera works fine in Ubuntu itself my guess is that the problem is with the python libraries (or even likelier, my usage of them). Is there anybody here that was successful in accessing their webcam on linux using Python? Else I have to reside to Windows and VideoCapture (which relies on the win32 api and thus is Windows-only), something I'd rather not do. Thanks for any help, 2B === I am uUsing: WebCam: Logitech QuickCam Pro 400 Ubuntu Python 2.5 -- http://mail.python.org/mailman/listinfo/python-list
