保存用opencv录制的视频时出错

问题描述

我正在使用openCV进行录制，一开始录制进展顺利，但是我希望当我按下空格键时，录制的所有内容都保存在设备上（这是损坏的地方）。我收到以下错误：

OpenCV：FFMPEG：标签0x4745504d /'MPEG'不支持编解码器ID 2和格式'mp4 / MP4（MPEG-4 Part 14）' OpenCV：FFMPEG：后备使用标记0x7634706d /'mp4v'

然后窗口冻结。

这是代码：

def record_video():

     capture = cv2.VideoCapture(0)

     while capture.isOpened():

     res,video = capture.read()
     cv2.imshow("Recording Window",video)

     if cv2.waitKey(1) == 27: #ESC key to stop recording
         break
    
     elif cv2.waitKey(1) == 32: #SPACE key to start recording and save it to the device

         width = int(capture.get (cv2.CAP_PROP_FRAME_WIDTH))
         height = int(catch.get (cv2.CAP_PROP_FRAME_HEIGHT))

         code = cv2.VideoWriter_fourcc (* 'MPEG') #format
         recorder = cv2.VideoWriter("video.mp4",code,20,(width,height))

         while True:
             result,video_record = capture.read()
             recorder.write(video_record)
        
             if cv2.waitKey(1) & 0xFF == ord("q"): #q key to stop recording
                 break

         recorder.release()
         capture.release()
         cv2.destroyAllWindows()
        
    capture.release()
    cv2.destroyAllWindows()

解决方法

要创建.mp4视频，您需要将其初始化为*mp4v

code = cv2.VideoWriter_fourcc(*'mp4v') #format

但是，如果上述初始化对您不起作用，则需要使用ffmpeg编译opencv。 另一种选择是使用 Motion-JPEG 视频格式，与.mp4

相比质量要低得多

code = cv2.VideoWriter_fourcc(*'MJPG') #format
recorder = cv2.VideoWriter("video.avi",code,20,(width,height))