如何在 cv2.VideoWriter 中使用 FPS 参数? [英] How do I use the FPS argument in cv2.VideoWriter?

问题描述

好的，所以我正在制作视频.我想确切地知道如何使用 FPS 参数.它是一个浮点数，所以我认为这是我想要的每帧之间的间隔.你能给个例子吗?我只想知道视频会如何随着 FPS 参数值的变化而变化.，因为我制作的视频现在太快了.谢谢！

Ok, so I am making a video. I want to know exactly how to use the FPS argument. It is a float, so I assumed it was what interval do I want between each frame. Can you give an example? I just want to know how the video would change with varying FPS argument values., because my video I made is way too fast now. Thanks!

推荐答案

确实如此 - 每秒帧数.换句话说，你想每秒显示多少帧?

It really is just that - frames per second. In other words, how many frames do you want to display every second?

这是一个例子:

writer = cv2.VideoWriter(filename="my_video.avi",  #Provide a file to write the video to
fourcc=cv2.cv.CV_FOURCC('i','Y', 'U', 'V'),            #Use whichever codec works for you...
fps=15,                                        #How many frames do you want to display per second in your video?
frameSize=(width, height))                     #The size of the frames you are writing

示例用法:

while True:
    flag, frame = capture.read()
    cv2.imshow("Camera", frame)
    key_pressed = cv2.waitKey(10)
    if key_pressed == 27:                           #Escape key
        break
    writer.write(frame)
cv2.destroyAllWindows()

因此，您将拥有一个视频文件，其中包含您的相机捕获的所有静止帧，这些帧拼接在一起作为单个视频.每秒显示的帧数将与您使用 fps 参数设置的一样.(如果你的视频太快，我建议设置一个较低的fps)

Thus, you will have a video file that consists of all the still frames that your camera captured stitched together as a single video. The number of frames that are displayed per second will be as you set with the fps parameter. (If your video is too fast, I recommend setting a lower fps)

这段代码是我脑子里写的，所以我还没有测试过，但它应该可以工作.如果您有任何疑问或问题，请告诉我.希望对你有帮助！

I wrote this code off the top of my head, so I haven't tested it, but it should work. Let me know if you have any questions or problems. I hope this helps you!

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