标签:结束 实现原理 end video info mat 删除 xpath down
1.导入需要的库
import json
import os
import re
import shutil
import ssl
import time
import requests
from concurrent.futures import ThreadPoolExecutor
from lxml import etree
导入的库包括用于爬取和解析网页的库,还包括创建线程池的库和进行其他处理的库,大多数都是Python自带的,如有未安装的库,可使用pip install xxx命令进行安装。
2.设置请求参数
# 设置请求头等参数,防止被反爬
headers = {
‘Accept‘: ‘*/*‘,
‘Accept-Language‘: ‘en-US,en;q=0.5‘,
‘User-Agent‘: ‘Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.116 Safari/537.36‘
}
params = {
‘from‘: ‘search‘,
‘seid‘: ‘9698329271136034665‘
}
设置请求头等参数,减少被反爬的可能。
3.基本处理
def re_video_info(text, pattern):
‘‘‘利用正则表达式匹配出视频信息并转化成json‘‘‘
match = re.search(pattern, text)
return json.loads(match.group(1))
def create_folder(aid):
‘‘‘创建文件夹‘‘‘
if not os.path.exists(aid):
os.mkdir(aid)
def remove_move_file(aid):
‘‘‘删除和移动文件‘‘‘
file_list = os.listdir(‘./‘)
for file in file_list:
# 移除临时文件
if file.endswith(‘_video.mp4‘):
os.remove(file)
pass
elif file.endswith(‘_audio.mp4‘):
os.remove(file)
pass
# 保存最终的视频文件
elif file.endswith(‘.mp4‘):
if os.path.exists(aid + ‘/‘ + file):
os.remove(aid + ‘/‘ + file)
shutil.move(file, aid)
主要包括两方面的基本处理,为正式爬取下载做准备:
利用正则表达式提取信息
通过requests库请求得到请求后的网页,属于文本,通过正则表达式提取得到关于将要下载的视频的有用信息,便于后一步处理。
文件处理
将下载视频完成后的相关文件进行处理,外汇MT4教程包括删除生成的临时的音视频分离的文件和移动最终视频文件到指定文件夹。
4.下载视频
def download_video_batch(referer_url, video_url, audio_url, video_name, index):
‘‘‘批量下载系列视频‘‘‘
# 更新请求头
headers.update({"Referer": referer_url})
# 获取文件名
short_name = video_name.split(‘/‘)[2]
print("%d.\t视频下载开始:%s" % (index, short_name))
# 下载并保存视频
video_content = requests.get(video_url, headers=headers)
print(‘%d.\t%s\t视频大小:‘ % (index, short_name),
round(int(video_content.headers.get(‘content-length‘, 0)) / 1024 / 1024, 2), ‘\tMB‘)
received_video = 0
with open(‘%s_video.mp4‘ % video_name, ‘ab‘) as output:
headers[‘Range‘] = ‘bytes=‘ + str(received_video) + ‘-‘
response = requests.get(video_url, headers=headers)
output.write(response.content)
# 下载并保存音频
audio_content = requests.get(audio_url, headers=headers)
print(‘%d.\t%s\t音频大小:‘ % (index, short_name),
round(int(audio_content.headers.get(‘content-length‘, 0)) / 1024 / 1024, 2), ‘\tMB‘)
received_audio = 0
with open(‘%s_audio.mp4‘ % video_name, ‘ab‘) as output:
headers[‘Range‘] = ‘bytes=‘ + str(received_audio) + ‘-‘
response = requests.get(audio_url, headers=headers)
output.write(response.content)
received_audio += len(response.content)
return video_name, index
def download_video_single(referer_url, video_url, audio_url, video_name):
‘‘‘单个视频下载‘‘‘
# 更新请求头
headers.update({"Referer": referer_url})
print("视频下载开始:%s" % video_name)
# 下载并保存视频
video_content = requests.get(video_url, headers=headers)
print(‘%s\t视频大小:‘ % video_name, round(int(video_content.headers.get(‘content-length‘, 0)) / 1024 / 1024, 2), ‘\tMB‘)
received_video = 0
with open(‘%s_video.mp4‘ % video_name, ‘ab‘) as output:
headers[‘Range‘] = ‘bytes=‘ + str(received_video) + ‘-‘
response = requests.get(video_url, headers=headers)
output.write(response.content)
# 下载并保存音频
audio_content = requests.get(audio_url, headers=headers)
print(‘%s\t音频大小:‘ % video_name, round(int(audio_content.headers.get(‘content-length‘, 0)) / 1024 / 1024, 2), ‘\tMB‘)
received_audio = 0
with open(‘%s_audio.mp4‘ % video_name, ‘ab‘) as output:
headers[‘Range‘] = ‘bytes=‘ + str(received_audio) + ‘-‘
response = requests.get(audio_url, headers=headers)
output.write(response.content)
received_audio += len(response.content)
print("视频下载结束:%s" % video_name)
video_audio_merge_single(video_name)
这部分包括系列视频的批量下载和单个视频的下载,两者的大体实现原理近似,但是由于两个函数的参数有差别,因此分别实现。
在具体的实现中,首先更新请求头,请求视频链接并保存视频(无声音),再请求音频链接并保存音频,在这个过程中得到相应的视频和音频文件的大小。
5.视频和音频合并成完整的视频
def video_audio_merge_batch(result):
‘‘‘使用ffmpeg批量视频音频合并‘‘‘
video_name = result.result()[0]
index = result.result()[1]
import subprocess
video_final = video_name.replace(‘video‘, ‘video_final‘)
command = ‘ffmpeg -i "%s_video.mp4" -i "%s_audio.mp4" -c copy "%s.mp4" -y -loglevel quiet‘ % (
video_name, video_name, video_final)
subprocess.Popen(command, shell=True)
print("%d.\t视频下载结束:%s" % (index, video_name.split(‘/‘)[2]))
def video_audio_merge_single(video_name):
‘‘‘使用ffmpeg单个视频音频合并‘‘‘
print("视频合成开始:%s" % video_name)
import subprocess
command = ‘ffmpeg -i "%s_video.mp4" -i "%s_audio.mp4" -c copy "%s.mp4" -y -loglevel quiet‘ % (
video_name, video_name, video_name)
subprocess.Popen(command, shell=True)
print("视频合成结束:%s" % video_name)
这个过程也是批量和单个分开,大致原理差不多,都是调用subprogress模块生成子进程,Popen类来执行shell命令,由于已经将ffmpeg加入环境变量,所以shell命令可以直接调用ffmpeg来合并音视频。
6.3种下载方式的分别实现
def batch_download():
‘‘‘使用多线程批量下载视频‘‘‘
# 提示输入需要下载的系列视频对应的id
aid = input(‘请输入要下载的视频id
if aid:
pass
else:
aid = ‘91748877‘
# 提示选择清晰度
quality = input(‘请选择清晰度(1代表高清,2代表清晰,3代表流畅),默认高清\t‘)
if quality == ‘2‘:
pass
elif quality == ‘3‘:
pass
else:
quality = ‘1‘
acc_quality = int(quality) - 1
# ssl模块,处理https请求失败问题,生成证书上下文
ssl._create_default_https_context = ssl._create_unverified_context
# 获取视频主题
url = ‘https://www.bilibili.com/video/av{}?p=1‘.format(aid)
html = etree.HTML(requests.get(url, params=params, headers=headers).text)
title = html.xpath(‘//*[@id="viewbox_report"]/h1/span/text()‘)[0]
print(‘您即将下载的视频系列是:‘, title)
# 创建临时文件夹
create_folder(‘video‘)
create_folder(‘video_final‘)
# 定义一个线程池,大小为3
pool = ThreadPoolExecutor(3)
# 通过api获取视频信息
res_json = requests.get(‘https://api.bilibili.com/x/player/pagelist?aid={}‘.format(aid)).json()
video_name_list = res_json[‘data‘]
print(‘共下载视频{}个‘.format(len(video_name_list)))
for i, video_content in enumerate(video_name_list):
video_name = (‘./video/‘ + video_content[‘part‘]).replace(" ", "-")
origin_video_url = ‘https://www.bilibili.com/video/av{}‘.format(aid) + ‘?p=%d‘ % (i + 1)
# 请求视频,获取信息
res = requests.get(origin_video_url, headers=headers)
# 解析出视频详情的json
video_info_temp = re_video_info(res.text, ‘__playinfo__=(.*?)
标签:结束 实现原理 end video info mat 删除 xpath down
原文地址:https://www.cnblogs.com/benming/p/12711557.html