python - 如何在 rpi3 上通过 python 运行网络摄像头

Question

我正在尝试将 MS lifecam 与我的 raspberry-pi-3 结合使用。当我键入以下命令时，它可以在命令行上运行:

$ fswebcam img.jpg
Trying source module v4l2...
/dev/video0 opened.
...
Writing JPEG image to 'img.jpg'  # this works fine

现在我想通过 python 代码运行相机:

import pygame
import pygame.camera
from pygame.locals import *
DEVICE = '/dev/video0'
SIZE = (640, 480)  # I also tried with img size (384,288), same error
FILENAME = 'capture.jpg'
pygame.init()
pygame.camera.init()
camera = pygame.camera.Camera(DEVICE, SIZE)
camera.start()   # error on executing this line
pygame.image.save(screen, FILENAME)
camera.stop()

报错是:

SystemError: ioctl(VIDIOC_S_FMT) failure: no supported formats

这里我很疑惑。相机由 rasp-pi 支持，所以看起来我的 python 代码必须在某处更新。你能帮忙吗？

Answer 1

尝试使用这个:

camera = pygame.camera.Camera(pygame.camera.list_cameras()[0])
camera.start()
img = camera.get_image()
pygame.image.save(img, FILENAME)