多线程、进程下载视频

女爷i 2022-12-17 07:07 54阅读 0赞

### 多线程、进程下载视频 ###

*  一、结果展示
 *  二、使用的工具
 *  三、线程进程方法化
 *  四、多进程视频下载
 *  五、存在的问题

# 一、结果展示 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 1]

# 二、使用的工具 #

视频下载使用you-get,  
多线程使用threading、  
多进程multiprocessing  
以下为三个库的简介  
you-get:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 2]

threading:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 3]

multiprocessing  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 4]

# 三、线程进程方法化 #

from concurrent.futures import  ThreadPoolExecutor as e
    import time,sys
    from multiprocessing.pool import Pool
    from  threading import Thread as t
    
    
    class Thread_Pool():
     """需要输入线程数量，函数，参数"""
    	def __init__(self,thread_,fun,param=""):
            """传入list，通过map一个一个迭代"""
        	self.thread = thread_
        	self.fun = fun
        	if type(param).__name__ == 'list':
            	self.param = param
        	else:
            	option = input("param须为列表格式,是否继续？？？")
            if option == "是":
    
                self.param = [i for i in range(self.thread)]
            else:
                sys.exit()
    
     	def concurrent_Thread_package(self):
        	"""concurrent线程"""
        	global results
        	starttime = time.time()
    
        	pool = e(self.thread)  # 一次同时多少个
        	try:
            	results = pool.map(self.fun, self.param)
        	except:
            	pass
        	for i, result in enumerate(results):
            	print('done ! result {}: {}'.format(i, result))
        	endtime = time.time()
        	across = (endtime-starttime)/60
        	print("花费时间{time}分钟-------------------------------------".format(time=across))
    
    	def multiprocessing_pool(self):
        	print("这是进程>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>")
        	"""multiprocessing.pool方法,必须在if__name__=="__main__"中运行"""
        	starttime = time.time()
        	pool = Pool(self.thread)
        	pool.map(self.fun, tuple(self.param))
        	endtime = time.time()
        	dtime = endtime - starttime
        	print("程序运行时间：%.8s s" % dtime)
    
    	def thread_module(self):
        	print("线程单个，没有建立线程池")
        	start = time.time()
        	for i in self.param:
            	t_ = t(target=self.fun, args=(i,))  # args传参
            	t_.start()
            	t_.join()
        	end = time.time()
        	dtime =end-start
        	print("程序运行时间：%.8s s" % dtime)
    
    
    	def processing_thread(self,i):
        	pool = e(self.thread)  # 一次同时多少个
    
        	results = pool.map(self.fun, self.param)
        	for i_, result in enumerate(results):
            	print('第{}个进程下的第{}线程! result : {}done '.format(i, i_,result))
    
    
    	def processing_and_threading(self):
        	"""进程上附件线程,线程只能异步，进程可以并发"""
        	pool = Pool(2)
        	print()
        	i = 1
        	for i in range(10):
            	pool.apply_async(self.processing_thread,(i,))
            	i+=1
    
        	pool.close()
        	pool.join()

# 四、多进程视频下载 #

import os,glob,time
    from 常用设置.进程与线程.线程方法化 import Thread_Pool as t
    def download_mp4(i):
    
    	path = os.path.dirname(__file__)+"//下载"
    	os.system(f"you-get -o {path} https://www.bilibili.com/video/BV1Wy4y1B7vg?p={i}")
    
    if __name__ =="__main__":
    	index = []
    	for i in range(1,20):
        	index.append(i)
    	t(20,download_mp4,index).multiprocessing_pool()#concurrent_Thread_package
    	path = os.path.dirname(__file__)+"//下载"
    	for i in glob.glob(os.path.join(path,"*")):
        	if i.split(".")[-1] == "xml":
            	os.remove(i)

# 五、存在的问题 #

即使多进程、多线程下载速度依旧没有快多少，问题在于后续视频下载网速提不上来，比如一开始能有4M/s，后续只有80K/s

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/abf6d0c0bdef4859bb6c15ffb238a96d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221123/b070fe1f660e4e0db5067ba604bc0f82.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 2]: /images/20221123/15a9ac12ffb4476889fc367a0ba8dbd6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 3]: /images/20221123/fc9634142bc649439ea375f01692cf00.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3B5dGhvbl9fcmVwb3J0ZWQ_size_16_color_FFFFFF_t_70_pic_center 4]: /images/20221123/562a55e8ea584f0e8aeb0c1cf87963f8.png