[英]Save video instead of saving images while using basler camera and python
我正在使用Basler相機和python錄制一些視頻。 我可以成功捕獲單個幀,但是我不知道如何錄制視頻。
以下是我的代碼:
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
我還沒有找到使用pypylon
錄制視頻的方法; 它似乎是圍繞Pylon的漂亮包裝紙。 但是,我找到了一種使用imageio
保存視頻的方法:
from imageio import get_writer
with get_writer('I:/output-filename.mp4', fps=fps) as writer:
# Some stuff with the frames
只要FFmpeg程序可用,以上內容就可以與.mov
, .avi
, .mpg
, .mpeg
, .mp4
, .mkv
或.wmv
使用。 如何安裝此程序取決於您的操作系統。 有關可以使用的參數的詳細信息,請參見此鏈接。
然后,只需使用以下命令替換對imwrite
的調用:
writer.append_data(image)
確保在with
塊中發生這種情況。
一個示例實現:
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
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