opencv图像处理-错误记录1-视频录制不能保存_ffmpeg: tag 0x67706a6d/'mjpg' is not supported wit

fourcc = cv2.VideoWriter_fourcc(*'MJPG/mjpg/mp4v/MP4V')
vw = cv2.VideoWriter('out.mp4/avi', fourcc, 30, (1280,720))

报错：
OpenCV: FFMPEG: tag 0x47504a4d/'MJPG/mjpg/mp4v/MP4V/' is not supported with codec id 8/13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
其中fourcc = cv2.VideoWriter_fourcc(*'mjpg/mp4v')不会报错，但是视频录制出来只有1kb，打不开。

将代码修改为：

case1：

fourcc = cv2.VideoWriter_fourcc(*'MJPG')  
vw = cv2.VideoWriter('out.mp4', fourcc, 30, (640,480))

报错：

OpenCV: FFMPEG: tag 0x47504a4d/'MJPG' is not supported with codec id 8 and format 'mp4 / MP4 (MPEG-4 Part 14)'

OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'

现象：修改分辨率后有报错+视频能录制+部分播放器能打开

case2：

fourcc = cv2.VideoWriter_fourcc(*'MP4V')  
vw = cv2.VideoWriter('out.mp4', fourcc, 30, (640,480))

报错：

OpenCV: FFMPEG: tag 0x5634504d/'MP4V' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'

OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'、

现象：修改分辨率后有报错+视频能录制+视频能打开

case3：

fourcc = cv2.VideoWriter_fourcc(*'mjpg/mp4v')  
vw = cv2.VideoWriter('out.mp4', fourcc, 30, (640,480))

报错：

OpenCV: FFMPEG: tag 0x67706a6d/'mjpg' is not supported with codec id 8 and format 'mp4 / MP4 (MPEG-4 Part 14)'

OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'

现象：修改分辨率后有报错+视频能录制+部分播放器能打开

case4：

fourcc = cv2.VideoWriter_fourcc(*'mp4v')  
vw = cv2.VideoWriter('out.mp4', fourcc, 30, (640,480))

无报错：

现象：修改分辨率后无报错+视频能录制+播放器都能打开。

总结：

这个错误的重点是找到自己笔记本电脑摄像头输出图像的分辨率

(我被自带相机设置的分辨率误导了),我是从1080p、720p、360p试出来的!!!!!!!!!!

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