視頻的讀取與保存 python

1. 視頻的讀取

主要使用python的cv2

主要介紹：視頻幀讀取、視頻寬高讀取、FPS讀取

import cv2 as cv
vc = cv.VideoCapture('12.mp4')  # 讀入視頻文件 
fps=vc.get(cv.CAP_PROP_FPS)  #獲取fps
size = (int(vc.get(cv.CAP_PROP_FRAME_WIDTH)),int(vc.get(cv.CAP_PROP_FRAME_HEIGHT)))  #獲取寬高
rval, frame = vc.read()
while(rval): 
    rval, frame = vc.read()    #  循環讀取每一視頻幀

2. 視頻的保存

1）PIL

      給圖片視頻上添加矩形框、文字

from PIL import Image, ImageFont, ImageDraw

img_draw= Image.open(filename) #返回一個Image對象
img_draw.show()
draw = ImageDraw.Draw(img_draw)

draw.rectangle((x,y,h,w), width=5)          

fontpath = "font/simsun.ttc"  
font = ImageFont.truetype(fontpath, 32)
draw.text((x,y)), '你好', font=font, fill=(255, 255, 255))

draw.save(outfile)

2) CV2

     將所需的視頻幀進行保存成視頻形式

     提取音頻形式

     將視頻配上音頻

import subprocess
import cv2 as cv

def video2mp3(file_name):
    """
    將視頻轉爲音頻
    :param file_name: 傳入視頻文件的路徑
    :return:
    """
    outfile_name = file_name.split('.')[0] + '.mp3'
    subprocess.call('ffmpeg -i ' + file_name
                    + ' -f mp3 ' + outfile_name, shell=True)

def video_add_mp3(file_name, mp3_file):
    """
     視頻添加音頻
    :param file_name: 傳入視頻文件的路徑
    :param mp3_file: 傳入音頻文件的路徑
    :return:
    """
    outfile_name = file_name.split('.')[0] + '-txt.mp4'
    subprocess.call('ffmpeg -i ' + file_name
                    + ' -i ' + mp3_file + ' -strict -2 -f mp4 '
                    + outfile_name, shell=True)

def save_new_video(file_name):
    """      將視頻幀保存     
    :param file_name: 傳入視頻文件的路徑  
    :return:     
    """
    outfile_name = 'new_'+file_name.split('.')[0] + '.mp4'

    vc = cv.VideoCapture(file_name)
    interval=vc.get(cv.CAP_PROP_FPS)

    fourcc = cv.VideoWriter_fourcc(*"mp4v")
    size = (int(vc.get(cv.CAP_PROP_FRAME_WIDTH)),int(vc.get(cv.CAP_PROP_FRAME_HEIGHT)))
    out = cv.VideoWriter(outfile_name, fourcc, interval, size)

    rval, frame = vc.read()
    while(rval):
        out.write(frame)
        rval, frame = vc.read()
    vc.release()
    out.release()


if __name__ == '__main__':
    # video2mp3(file_name='MyVideo_3.mp4')
    #save_new_video(file_name='MyVideo_3.mp4')
    video_add_mp3(file_name='new_MyVideo_3.mp4', mp3_file='MyVideo_3.mp3')