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