我想在每一帧中提取 N 3段视频的秒数(即 vid1.flv, vid2.flv & vid3.flv),并将这些相应的帧保存到其特定的文件夹中(其中文件夹名称是视频名称,即。vid1, vid2 & vid3). 我如何才能做到这一点?
目前,我只能提取一个视频的帧,这是我的一个视频的代码。
import cv2
import os
import logging
def read_video(input_filename):
return cv2.VideoCapture(input_filename)
def save_frame(count, sec, vid_cap, output_directory):
vid_cap.set(cv2.CAP_PROP_POS_MSEC, sec * 1000)
hasFrames, frame = vid_cap.read()
if hasFrames:
name = os.path.join(os.getcwd(), output_directory, "frame" + str(count) + ".png")
cv2.imwrite(name, frame)
return hasFrames
def get_frames(input_filename, output_directory, frameRate):
"""
Capture images from a video at every (i.e, 5 sec, 5 mn, etc.)
:param frameRate: time we want to capture the images, in seconds.
"""
try:
if not os.path.exists(output_directory):
os.makedirs(output_directory)
except OSError:
logging.error('Error creating directory')
sec = 0
count = 1
vid_cap = read_video(input_filename)
success = save_frame(count, sec, vid_cap, output_directory)
while success:
count += 1
sec = sec + frameRate
sec = round(sec, 2)
success = save_frame(count, sec, vid_cap, output_directory)
if __name__ == "__main__":
input_filename = 'videos/vid1.flv'
output_directory = 'frames'
seconds = 30
get_frames(input_filename, output_directory, seconds)
你可能想要替换。
if __name__ == "__main__":
input_filename = 'videos/01_123.flv'
output_directory = 'frames'
seconds = 30
get_frames(input_filename, output_directory, seconds)
用:
if __name__ == "__main__":
input_filename = 'videos/01_123.flv'
output_directory = 'frames01'
seconds = 30
get_frames(input_filename, output_directory, seconds)
input_filename = 'videos/02_123.flv'
output_directory = 'frames02'
seconds = 30
get_frames(input_filename, output_directory, seconds)
复制粘贴是你的朋友,如果你需要,可以添加更多的视频。
如果你觉得冒险,你甚至可以尝试创建一个循环。
if __name__ == "__main__":
for num in range(3) :
input_filename = 'videos/%02d_123.flv' % (num+1)
output_directory = 'frames%02d' % (num+1)
seconds = 30
get_frames(input_filename, output_directory, seconds)
最后,你可以在现有的视频上自动循环。
if __name__ == "__main__":
root, dirs, files = os.walk( 'videos' ).next()
for f in files :
input_filename = os.path.join( root, f )
output_directory = f.split('.')[0]
seconds = 30
get_frames(input_filename, output_directory, seconds)