python如何实现视频转代码视频

本文实例为大家分享了python如何实现视频转代码视频的具体代码，供大家参考，具体内容如下

# -*- coding:utf-8 -*-
#coding:utf-8
import argparse
import os
import cv2
import subprocess
from cv2 import VideoWriter, VideoWriter_fourcc, imread, resize
from PIL import Image, ImageFont, ImageDraw

# 命令行输入参数处理
# aparser = argparse.ArgumentParser()
# aparser.add_argument('file')
# aparser.add_argument('-o','--output')
# aparser.add_argument('-f','--fps',type = float, default = 24)#帧
# aparser.add_argument('-s','--save',type = bool, nargs='?', default = False, const = True)
# 是否保留Cache文件，默认不保存

# 获取参数
# args = parser.parse_args()
# INPUT = args.file
# OUTPUT = args.output
# SAVE = args.save
# FPS = args.fps
# 像素对应ascii码

ascii_char = list("$@B％8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:oa+>!:+. ")

# ascii_char = list("MNHQ$OC67+>!:-. ")
# ascii_char = list("MNHQ$OC67)oa+>!:+. ")

# 将像素转换为ascii码
def get_char(r, g, b, alpha=256):
 if alpha == 0:
   return ''
 length = len(ascii_char)
 gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b)
 unit = (256.0 + 1) / length
 return ascii_char[int(gray / unit)]

# 将txt转换为图片
def txt2image(file_name):
 im = Image.open(file_name).convert('RGB')
 # gif拆分后的图像，需要转换，否则报错，由于gif分割后保存的是索引颜色
 raw_width = im.width
 raw_height = im.height
 width = int(raw_width / 6)
 height = int(raw_height / 15)
 im = im.resize((width, height), Image.NEAREST)

txt = ""
 colors = []
 for i in range(height):
   for j in range(width):
     pixel = im.getpixel((j, i))
     colors.append((pixel[0], pixel[1], pixel[2]))
     if (len(pixel) == 4):
       txt += get_char(pixel[0], pixel[1], pixel[2], pixel[3])
     else:
       txt += get_char(pixel[0], pixel[1], pixel[2])
   txt += '\n'
   colors.append((255, 255, 255))

im_txt = Image.new("RGB", (raw_width, raw_height), (255, 255, 255))
 dr = ImageDraw.Draw(im_txt)
 # font = ImageFont.truetype(os.path.join("fonts","汉仪楷体简.ttf"),18)
 font = ImageFont.load_default().font
 x = y = 0
 # 获取字体的宽高
 font_w, font_h = font.getsize(txt[1])
 font_h *= 1.37 # 调整后更佳
 # ImageDraw为每个ascii码进行上色
 for i in range(len(txt)):
   if (txt[i] == '\n'):
     x += font_h
     y = -font_w
     # self, xy, text, fill = None, font = None, anchor = None,
     #*args, ** kwargs
   dr.text((y, x), txt[i], fill=colors[i])
   #dr.text((y, x), txt[i], font=font, fill=colors[i])
   y += font_w

name = file_name
 #print(name + ' changed')
 im_txt.save(name)

# 将视频拆分成图片
def video2txt_jpg(file_name):
 vc = cv2.VideoCapture(file_name)
 c = 1
 if vc.isOpened():
   r, frame = vc.read()
   if not os.path.exists('Cache'):
     os.mkdir('Cache')
   os.chdir('Cache')
 else:
   r = False
 while r:
   cv2.imwrite(str(c) + '.jpg', frame)
   txt2image(str(c) + '.jpg') # 同时转换为ascii图
   r, frame = vc.read()
   c += 1
 os.chdir('..')
 return vc

# 将图片合成视频
def jpg2video(outfile_name, fps):
 fourcc = VideoWriter_fourcc(*"MJPG")

images = os.listdir('Cache')
 im = Image.open('Cache/' + images[0])
 vw = cv2.VideoWriter(outfile_name + '.avi', fourcc, fps, im.size)

os.chdir('Cache')
 for image in range(len(images)):
   # Image.open(str(image)+'.jpg').convert("RGB").save(str(image)+'.jpg')
   frame = cv2.imread(str(image + 1) + '.jpg')
   vw.write(frame)
   #print(str(image + 1) + '.jpg' + ' finished')
 os.chdir('..')
 vw.release()

# 递归删除目录
def remove_dir(path):
 if os.path.exists(path):
   if os.path.isdir(path):
     dirs = os.listdir(path)
     for d in dirs:
       if os.path.isdir(path + '/' + d):
         remove_dir(path + '/' + d)
       elif os.path.isfile(path + '/' + d):
         os.remove(path + '/' + d)
     os.rmdir(path)
     return
   elif os.path.isfile(path):
     os.remove(path)
   return

# 调用ffmpeg获取mp3音频文件
def video2mp3(file_name):
 outfile_name = file_name.split('.')[0] + '.mp3'
 subprocess.call('ffmpeg -i ' + file_name + ' -f mp3 ' + outfile_name, shell=True)

# 合成音频和视频文件
def video_add_mp3(file_name, mp3_file):
 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)

if __name__ == '__main__':
 INPUT = r"G:\py\学习python\视频到代码\video39.mp4"
 OUTPUT = r"G:\py\学习python\视频到代码\video39_2.mp4"
 SAVE = r"G:\py\学习python\视频到代码\\video39_3"
 FPS = "24"
 vc = video2txt_jpg(INPUT)
 FPS = vc.get(cv2.CAP_PROP_FPS) # 获取帧率
 print(FPS)

vc.release()

jpg2video(INPUT.split('.')[0], FPS)
 print(INPUT, INPUT.split('.')[0] + '.mp3')
 video2mp3(INPUT)
 video_add_mp3(INPUT.split('.')[0] + '.avi', INPUT.split('.')[0] + '.mp3')

if (not SAVE):
   remove_dir("Cache")
   os.remove(INPUT.split('.')[0] + '.mp3')
   os.remove(INPUT.split('.')[0] + '.avi')

流程图：

这次python编程的流程图如下： 

注意事项：

在编程的过程中有需要注意的几点：

• 这次编程使用到了opencv库，需要安装

• 帧率的获取可以通过这个函数——FPS = vc.get(cv2.CAP_PROP_FPS)

• 合成后的视频是没有声音的,我们使用ffmpeg进行合成
  

来源：https://blog.csdn.net/mp624183768/article/details/81161260