I am working with minoru3D, a dual-webcam that is really two z-star
vimicro webcams and a usb hub in a single package.
I can get images from either one of the cameras using python-opencv
(Ubuntu 9.10, 32 bits), but when I try to capture from both cameras in
sequence I get this error:
"VIDIOC_STREAMON error 28, No space left on device"
Here are the error (funnily, there is no traceback) and code I am using:
####### Error from command line (not even a traceback):
"""
kandin...@derive:~/data/work/hack/pyralax$ python dualcam.py
VIDIOC_STREAMON error 28, No space left on device
"""
####### CODE:
import pygame
import Image
from pygame.locals import *
import sys
import opencv
#this is important for capturing/displaying images
from opencv import highgui
cameras = []
def create_camera(n):
camera = highgui.cvCreateCameraCapture(n)
highgui.cvSetCaptureProperty(camera, highgui.CV_CAP_PROP_FRAME_WIDTH, 640)
highgui.cvSetCaptureProperty(camera, highgui.CV_CAP_PROP_FRAME_HEIGHT, 480)
return camera
def get_image(camera):
im = highgui.cvQueryFrame(camera)
# Add the line below if you need it (Ubuntu 8.04+)
im = opencv.cvGetMat(im)
#convert Ipl image to PIL image
return opencv.adaptors.Ipl2PIL(im)
def blit_image(im, camera):
pg_img = pygame.image.frombuffer(im.tostring(), im.size, im.mode)
screen.blit(pg_img, (640*i,0))
fps = 15.0
pygame.init()
window = pygame.display.set_mode((1280,480))
pygame.display.set_caption("WebCam Demo")
screen = pygame.display.get_surface()
for i in (0, 1):
cameras.append(create_camera(i))
while True:
events = pygame.event.get()
for event in events:
if event.type == QUIT or event.type == KEYDOWN:
sys.exit(0)
for i, camera in enumerate(cameras):
im = get_image(camera)
blit_image(im, i)
pygame.display.flip()
pygame.time.delay(int(1000 * 1.0/fps))
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