如何在python中打开具有.mpg格式的视频

Question

我正在对.mpg格式的视频进行对象跟踪，我正在做的是我正在使用OpenCV来跟踪对象，但是当我在我的代码中打开它时我遇到了一些，我已经附加了我的代码。

import cv2
import sys
(major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.')
if __name__ == '__main__' :
# Set up tracker.
# Instead of MIL, you can also use
tracker_types = ['BOOSTING', 'MIL','KCF', 'TLD', 'MEDIANFLOW', 'GOTURN', 'MOSSE', 'CSRT']
tracker_type = tracker_types[1]
print(tracker_type)

if tracker_type == 'MIL':
tracker = cv2.TrackerMIL_create()

# Read video
video = cv2.VideoCapture("Stroll.mpg")
# Exit if video not opened.
if not video.isOpened():
print ("Could not open video")
sys.exit()
# Read first frame.
ok, frame = video.read()
if not ok:
print ('Cannot read video file')
sys.exit()
# Define an initial bounding box
bbox = (287, 23, 86, 320)
# Uncomment the line below to select a different bounding box
bbox = cv2.selectROI(frame, False)
# Initialize tracker with first frame and bounding box
ok = tracker.init(frame, bbox)
while True:
# Read a new frame
ok, frame = video.read()
if not ok:
break
# Start timer
timer = cv2.getTickCount()
# Update tracker
ok, bbox = tracker.update(frame)
# Calculate Frames per second (FPS)
fps = cv2.getTickFrequency() / (cv2.getTickCount() - timer)
# Draw bounding box
if ok:
# Tracking success
p1 = (int(bbox[0]), int(bbox[1]))
p2 = (int(bbox[0] + bbox[2]), int(bbox[1] + bbox[3]))
cv2.rectangle(frame, p1, p2, (255,0,0), 2, 1)
else :
# Tracking failure
cv2.putText(frame, "Tracking failure detected", (100,80), cv2.FONT_HERSHEY_SIMPLEX, 0.75,(0,0,255),2)
# Display tracker type on frame
cv2.putText(frame, tracker_type + " Tracker", (100,20), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50),2)
# Display FPS on frame
cv2.putText(frame, "FPS : " + str(int(fps)), (100,50), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50), 2)
# Display result
cv2.imshow("Tracking", frame)
# Exit if ESC pressed
k = cv2.waitKey(1) & 0xff
if k == 27 : break

但我在这里面临的错误是：-

Could not open video
[ERROR:0] global C:projectsopencv-pythonopencvmodulesvideoiosrccap.cpp
(116) cv::VideoCapture::open VIDEOIO(CV_IMAGES): raised OpenCV exception:
OpenCV(4.1.2) C:projectsopencv-pythonopencvmodulesvideoio
srccap_images.cpp:253: error: (-5:Bad argument) CAP_IMAGES: can't find
starting number (in the name of file): Stroll.mpg in function 'cv::icvExtractPattern'

我正在使用python 3.6.8
OpenCV版本4.1.2

Answer 1

可能是错误的路径 检查 Stroll.mpg 是否在您的工作目录中。如果是，请尝试使用.mp4视频。很可能是路径错误或文件名拼写错误。 参考： https://answers.opencv.org/question/1965/cv2videocapture-cannot-read-from-file/

Answer 2

确保你的opencv是用ffmpeg编译的，它提供了所有这些媒体解码器(可能没有(。

因此，有人有类似的问题。