抖音重复镜头慢动作(抖音重复镜头慢动作怎么弄)

在影视以及抖音中，我们都能看到各种慢动作效果。比如武打片为了动作的特效，往往会放慢播放速度等等。今天，我们就通过OpenCV来实现其慢动作效果。

慢动作实现原理：

1.读取视频，将视频分为3部分。第一部分为慢动作前的视频片段，第二部分为慢动作视频片段，第三部分为慢动作后的视频片段2.将这3部分同时保存为视频，但是前后两个片段帧率与原视频相同，慢动作片段将视频的帧率设置为103.最后，将3个短视频合并，合并时，设置慢动作片段某帧循环添加几次。具体循环次数由原视频帧率除于慢动作帧率的取整数决定。

既然，我们已经了解了慢动作视频的制作原理。下面，我们直接用代码来实现慢动作的效果。具体代码如下所示：

# 慢动作实现#videoFileName需要实现慢动作的原视频文件名（包括路径）#fps_start慢动作的开始帧率#fps_end慢动作的结束帧率#fps_slow慢动作视频的原始帧率#最后保存视频的名字（包括路径）def video_slow_motion_effect(videoFileName, fps_start, fps_end, fps_slow, outputFileName):    cap = cv2.VideoCapture(videoFileName)    fps = cap.get(cv2.CAP_PROP_FPS)    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))    fourcc = cv2.VideoWriter_fourcc(*'MJPG')    videoWriter = cv2.VideoWriter(outputFileName + ".avi", fourcc, fps, (width, height))    video_start_writer = cv2.VideoWriter("video1.avi", fourcc, fps, (width, height))    video_slow_writer = cv2.VideoWriter("video2.avi", fourcc, fps_slow, (width, height))    video_end_writer = cv2.VideoWriter("video3.avi", fourcc, fps, (width, height))    i = 0    while (cap.isOpened()):        ret, frame = cap.read()        if ret:            if i >= fps_start and i <= fps_end:                video_slow_writer.write(frame)            elif i < fps_start:                video_start_writer.write(frame)            elif i > fps_end:                video_end_writer.write(frame)            i += 1            c = cv2.waitKey(1)            if c == 27:                break        else:            break    cap.release()    vc1 = cv2.VideoCapture("video1.avi")    vc2 = cv2.VideoCapture("video2.avi")    vc3 = cv2.VideoCapture("video3.avi")    while vc1.isOpened():        ret, frame = vc1.read()        if ret:            videoWriter.write(frame)        else:            break    while vc2.isOpened():        ret, frame = vc2.read()        if ret:            for i in range(int(fps/vc2.get(cv2.CAP_PROP_FPS))):                videoWriter.write(frame)        else:            break    while vc3.isOpened():        ret, frame = vc3.read()        if ret:            videoWriter.write(frame)        else:            break    vc1.release()    vc2.release()    vc3.release()    videoWriter.release()if __name__ == "__main__":    video_slow_motion_effect("45.mp4", 20, 50, 5, "output1")

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