使用basler相机和python保存视频而不是保存图像

Question

我用Basler相机和python录了一些视频。我可以成功地捕捉到不同的画面，但我不知道如何录制视频。

以下是我的代码：

import os
import pypylon
from imageio import imwrite
import time
start=time.time()

print('Sampling rate (Hz):')
fsamp = input()
fsamp = float(fsamp)

time_exposure = 1000000*(1/fsamp)

available_cameras = pypylon.factory.find_devices()
cam = pypylon.factory.create_device(available_cameras[0])
cam.open()

#cam.properties['AcquisitionFrameRateEnable'] = True
#cam.properties['AcquisitionFrameRate'] = 1000
cam.properties['ExposureTime'] = time_exposure

buffer = tuple(cam.grab_images(2000))
for count, image in enumerate(buffer):
    filename = str('I:/Example/{}.png'.format(count))
    imwrite(filename, image)
del buffer

Answer 1

我还没有找到用pypylon录制视频的方法，它似乎是一个非常轻的包装。但是，我找到了一种使用imageio保存视频的方法

from imageio import get_writer
with get_writer('I:/output-filename.mp4', fps=fps) as writer:
    # Some stuff with the frames

只要.mov、.avi、.mpg、.mpeg、.mp4、.mkv或.wmv都可以使用，只要FFmpeg程序可用。如何安装这个程序取决于您的操作系统。请参阅有关可以使用的参数的详细信息的此链接。

然后，将对imwrite的调用替换为：

writer.append_data(image)

确保这发生在with块中。

一个实例实现：

import os
import pypylon
from imageio import get_writer

while True:
    try:
        fsamp = float(input('Sampling rate (Hz): '))
        break
    except ValueError:
        print('Invalid input.')

time_exposure = 1000000 / fsamp

available_cameras = pypylon.factory.find_devices()
cam = pypylon.factory.create_device(available_cameras[0])
cam.open()

cam.properties['ExposureTime'] = time_exposure

buffer = tuple(cam.grab_images(2000))
with get_writer(
       'I:/output-filename.mkv',  # mkv players often support H.264
        fps=fsamp,  # FPS is in units Hz; should be real-time.
        codec='libx264',  # When used properly, this is basically
                          # "PNG for video" (i.e. lossless)
        quality=None,  # disables variable compression
        pixelformat='rgb24',  # keep it as RGB colours
        ffmpeg_params=[  # compatibility with older library versions
            '-preset',  # set to faster, veryfast, superfast, ultrafast
            'fast',     # for higher speed but worse compression
            '-crf',  # quality; set to 0 for lossless, but keep in mind
            '11'     # that the camera probably adds static anyway
        ]
) as writer:
    for image in buffer:
        writer.append_data(image)
del buffer