[英]Unable to write video using OpenCV in Python
I am trying to write real-time images into video file acquired by Kinect in Ubuntu. 我正在尝试将实时图像写入由Kinect在Ubuntu中获取的视频文件中。 See below the sample code: 请参见下面的示例代码:
#!/usr/bin/env python
import roslib
roslib.load_manifest('ros_package_name')
import rospy
import cv2
from sensor_msgs.msg import Image
from cv_bridge import CvBridge, CvBridgeError
class image_converter(object):
def __init__(self, topic_name, file_name, fps=20):
self.fps = fps
self.file_name = file_name
self.bridge = CvBridge()
self.image_sub = rospy.Subscriber(topic_name, Image, self.callback)
self.video_writer = None
def callback(self,data):
try:
cv_image = self.bridge.imgmsg_to_cv2(data, 'bgr8')
except CvBridgeError as e:
print e
if self.video_writer is None:
rows, cols, _ = cv_image.shape
self.video_writer = cv2.VideoWriter(self.file_name, -1, self.fps, (cols, rows))
self.video_writer.write(cv_image)
def clean_shutdown(self):
if self.video_writer is not None:
self.video_writer.release()
print 'Saving video file', self.file_name
def __del__(self):
self.clean_shutdown()
def main():
ic = image_converter('/kinect2/qhd/image_color_rect','video.avi')
rospy.init_node('save_video', anonymous=True)
rospy.on_shutdown(ic.clean_shutdown)
rospy.spin()
The code works smoothly and doesn't show any error in terminal. 该代码运行正常,并且在终端中未显示任何错误。 However, it doesn't produce any video file, even when I terminate it using ctrl+c
. 但是,即使我使用ctrl+c
终止它,它也不会产生任何视频文件。
Use a codec for saving your video. 使用编解码器保存视频。 Motion Jpeg almost always works! Motion Jpeg几乎总是可以工作!
fourcc = cv2.VideoWriter_fourcc(*'MJPG')
self.video_writer = cv2.VideoWriter(file_name, fourcc, fps, frame_size)
then the rest of the story. 然后是故事的其余部分。
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