Opencv Python 简明教程
OpenCV Python - Play Video from File
VideoCapture() 函数也可以从视频文件中而不是摄像机中提取帧。因此,我们只需要把摄像机索引替换为在 OpenCV 窗口中播放的视频文件的名称。
The VideoCapture() function can also retrieve frames from a video file instead of a camera. Hence, we have only replaced the camera index with the video file’s name to be played on the OpenCV window.
video=cv2.VideoCapture(file)
虽然这对于渲染视频文件来说已足够,但如果它带有音频,音频不会一同播放。为此,你需要安装 ffpyplayer 模块。
While this should be enough to start rendering a video file, if it is accompanied by sound. The sound will not play along. For this purpose, you will need to install the ffpyplayer module.
FFPyPlayer
FFPyPlayer 是 FFmpeg 库的 Python 绑定,可用于播放和编写媒体文件。要安装,请使用 pip 安装器实用程序,并使用以下命令。
FFPyPlayer is a python binding for the FFmpeg library for playing and writing media files. To install, use pip installer utility by using the following command.
pip3 install ffpyplayer
该模块中 MediaPlayer 对象的 get_frame() 方法返回一个音频帧,它将与从视频文件中读取的每个帧一起播放。
The get_frame() method of the MediaPlayer object in this module returns the audio frame which will play along with each frame read from the video file.
以下是播放视频文件及其音频的完整代码 −
Following is the complete code for playing a video file along with its audio −
import cv2
from ffpyplayer.player import MediaPlayer
file="video.mp4"
video=cv2.VideoCapture(file)
player = MediaPlayer(file)
while True:
ret, frame=video.read()
audio_frame, val = player.get_frame()
if not ret:
print("End of video")
break
if cv2.waitKey(1) == ord("q"):
break
cv2.imshow("Video", frame)
if val != 'eof' and audio_frame is not None:
#audio
img, t = audio_frame
video.release()
cv2.destroyAllWindows()