關(guān)于雪球兄,大家應(yīng)該都熟悉了,之前他寫過(guò)Python實(shí)戰(zhàn)文章,好評(píng)如潮,沒來(lái)得及看的小伙伴,可以戳這里了:
盤點(diǎn)常用驗(yàn)證碼標(biāo)注和識(shí)別項(xiàng)目線上部署三種方式——VUE前端、Java后端和Python后端部署
Python項(xiàng)目實(shí)戰(zhàn)篇——常用驗(yàn)證碼標(biāo)注&識(shí)別(CNN神經(jīng)網(wǎng)絡(luò)模型訓(xùn)練/測(cè)試/部署)
Python項(xiàng)目實(shí)戰(zhàn)篇——常用驗(yàn)證碼標(biāo)注&識(shí)別(前端+后端實(shí)現(xiàn)高效率數(shù)據(jù)標(biāo)注)
Python項(xiàng)目實(shí)戰(zhàn)篇——常用驗(yàn)證碼標(biāo)注&識(shí)別(數(shù)據(jù)采集/預(yù)處理/字符圖切割)
Python項(xiàng)目實(shí)戰(zhàn)篇——常用驗(yàn)證碼標(biāo)注和識(shí)別(需求分析和實(shí)現(xiàn)思路)
之前也有給大家分享B站的一些文章,感興趣的話可以看看這個(gè)文章,Python網(wǎng)絡(luò)爬蟲+數(shù)據(jù)分析:手把手教你用Python網(wǎng)絡(luò)爬蟲獲取B站UP主10萬(wàn)條數(shù)據(jù)并用Pandas庫(kù)進(jìn)行趣味數(shù)據(jù)分析。
一提到B站,第一印象就是視頻,相信很多小伙伴和我一樣,都想著去利用網(wǎng)絡(luò)爬蟲技術(shù)獲取B站的視頻吧,但是B站視頻其實(shí)沒有那么好拿到的,關(guān)于B站的視頻獲取,之前有介紹通過(guò)you-get庫(kù)進(jìn)行實(shí)現(xiàn),感興趣的小伙伴可以看這篇文章:You-Get 就是這么強(qiáng)勢(shì)!。
言歸正傳,經(jīng)常在B站上學(xué)習(xí)的小伙伴們可能經(jīng)常會(huì)遇到有的博主連載幾十個(gè),甚至幾百個(gè)視頻,尤其像這種編程語(yǔ)言、課程、工具使用等連續(xù)的教程,就會(huì)出現(xiàn)選集系列,如下圖所示。
當(dāng)然這些選集的字段我們?nèi)庋垡彩强梢钥吹玫降摹V皇峭ㄟ^(guò)程序來(lái)實(shí)現(xiàn)的話,可能真沒有想象的那么簡(jiǎn)單。那么這篇文章的目標(biāo)呢,就是通過(guò)Python網(wǎng)絡(luò)爬蟲技術(shù),基于selenium庫(kù),實(shí)現(xiàn)視頻選集的獲取。
這篇文章我們用的庫(kù)是selenium,這個(gè)是一個(gè)用于模擬用戶登錄的庫(kù),雖然給人的感覺是慢,但是在網(wǎng)絡(luò)爬蟲領(lǐng)域,這個(gè)庫(kù)還是用的蠻多的,用它來(lái)模擬登錄、獲取數(shù)據(jù)屢試不爽。下面是實(shí)現(xiàn)視頻選集采集的所有代碼,歡迎大家親自動(dòng)手實(shí)踐。
# coding: utf-8
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
class Item:
page_num = ""
part = ""
duration = ""
def __init__(self, page_num, part, duration):
self.page_num = page_num
self.part = part
self.duration = duration
def get_second(self):
str_list = self.duration.split(":")
sum = 0
for i, item in enumerate(str_list):
sum += pow(60, len(str_list) - i - 1) * int(item)
return sum
def get_bilili_page_items(url):
options = webdriver.ChromeOptions()
options.add_argument('--headless') # 設(shè)置無(wú)界面
options.add_experimental_option('excludeSwitches', ['enable-automation'])
# options.add_experimental_option("prefs", {"profile.managed_default_content_settings.images": 2,
# "profile.managed_default_content_settings.flash": 0})
browser = webdriver.Chrome(options=options)
# browser = webdriver.PhantomJS()
print("正在打開網(wǎng)頁(yè)...")
browser.get(url)
print("等待網(wǎng)頁(yè)響應(yīng)...")
# 需要等一下,直到頁(yè)面加載完成
wait = WebDriverWait(browser, 10)
wait.until(EC.visibility_of_element_located((By.XPATH, '//*[@class="list-box"]/li/a')))
print("正在獲取網(wǎng)頁(yè)數(shù)據(jù)...")
list = browser.find_elements_by_xpath('//*[@class="list-box"]/li')
# print(list)
itemList = []
second_sum = 0
# 2.循環(huán)遍歷出每一條搜索結(jié)果的標(biāo)題
for t in list:
# print("t text:",t.text)
element = t.find_element_by_tag_name('a')
# print("a text:",element.text)
arr = element.text.split('\n')
print(" ".join(arr))
item = Item(arr[0], arr[1], arr[2])
second_sum += item.get_second()
itemList.append(item)
print("總數(shù)量:", len(itemList))
# browser.page_source
print("總時(shí)長(zhǎng)/分鐘:", round(second_sum / 60, 2))
print("總時(shí)長(zhǎng)/小時(shí):", round(second_sum / 3600.0, 2))
browser.close()
return itemList
get_bilili_page_items("https://www.bilibili.com/video/BV1Eb411u7Fw")
這里用到的選擇器是xpath,利用視頻示例是B站的《高等數(shù)學(xué)》同濟(jì)版 全程教學(xué)視頻(宋浩老師)視頻選集,大家如果想抓取其他視頻選集的話,只需要更改上述代碼的最后一行的URL鏈接即可。
在運(yùn)行過(guò)程中小伙伴們應(yīng)該會(huì)經(jīng)常遇到這個(gè)問(wèn)題,如下圖所示。
這個(gè)是因?yàn)楣雀栩?qū)動(dòng)版本問(wèn)題導(dǎo)致的,只需要根據(jù)提示,去下載對(duì)應(yīng)的驅(qū)動(dòng)版本即可,驅(qū)動(dòng)下載鏈接:
https://chromedriver.storage.googleapis.com/index.html
我是Python進(jìn)階者。這篇文章主要給大家介紹了B站視頻選集內(nèi)容的獲取方法,基于網(wǎng)絡(luò)爬蟲,通過(guò)selenium庫(kù)和xpath選擇器進(jìn)行實(shí)現(xiàn),并且給大家例舉了常見問(wèn)題的處理方法。小伙伴們,快快用實(shí)踐一下吧!如果在學(xué)習(xí)過(guò)程中,有遇到任何問(wèn)題,歡迎加我好友,我拉你進(jìn)Python學(xué)習(xí)交流群共同探討學(xué)習(xí)。
不久看到一篇關(guān)于BibiBili視頻地址解析的源碼,正好有興趣,就自己也研究了研究,記錄一下。
1.以http://www.bilibili.com/video/av12535537/ 此視頻為例用HttpWatch抓包,很容易就能看出視頻的地址是從https://interface.bilibili.com/playurl?quality=4&player=1&cid=20627240&ts=1504780011&sign=f37df88434579a4b009a2bee708a2a71&qn=112里獲取的
按照常例分析下參數(shù):
cid很容易猜測(cè)出是視頻的ID號(hào),在網(wǎng)頁(yè)源碼里面也能找到
?
Quality和qn是視頻的清晰度
ts則是時(shí)間戳,這個(gè)也不用多說(shuō)
關(guān)鍵就是這個(gè)sign,在HttpWatch中是完全搜不到任何相關(guān)的信息的,但網(wǎng)頁(yè)訪問(wèn)了http://static.hdslb.com/play.swf這個(gè)文件,那么sign算法很可能就在這個(gè)播放器里。
2.下載這個(gè)SWF文件后,載入AS3 Sorcerer,代碼一大片不是很好找
?
那就保存到文本里,在文本中查找”視頻地址”這個(gè)關(guān)鍵字。
?
很快就能定位到關(guān)鍵的函數(shù)LoadPreview和LoadCidVideo那么接著搜索LoadPreview和LoadCidVideo定位到函數(shù)部分,可以看到代碼如下
?
那么關(guān)鍵算法就是在getSign和getSign_v2里面了
[mw_shl_code=actionscript3,true]public function getSign(_arg_1:String):String
{
var _local_2:int;
var _local_4 = null;
var _local_7:int;
var _local_8:int;
var _local_6:int;
var _local_5:int;
var _local_3:int = ESP;
_local_2 = _local_3;
_local_3 = (_local_3 - 48);
_local_5 = 16;
_local_6 = (_local_2 - 37);
ESP = (_local_3 & -16);
_local_7 = CModule.mallocString(_arg_1);
_local_8 = _arg_1.length;
do
{
var _local_9:int = (L__2E_str2 - _local_5);
_local_9 = li8((_local_9 + 16)) /*FlasCC (Alchemy)*/ ;
_local_3 = (_local_3 - 16);
si32(_local_9, (_local_3 + 4)); //FlasCC (Alchemy)
si32(_local_6, _local_3); //FlasCC (Alchemy)
ESP = _local_3;
F_sprintf();
_local_3 = (_local_3 + 16);
_local_5 = (_local_5 + -1);
_local_6 = (_local_6 + 2);
} while (_local_5 != 0);
_local_3 = (_local_3 - 16);
_local_9 = (_local_2 - 4);
si32(_local_9, (_local_3 + 12)); //FlasCC (Alchemy)
_local_9 = (_local_2 - 37);
si32(_local_9, (_local_3 + 8)); //FlasCC (Alchemy)
si32(_local_8, (_local_3 + 4)); //FlasCC (Alchemy)
si32(_local_7, _local_3); //FlasCC (Alchemy)
ESP = _local_3;
F_get_sign();
_local_3 = (_local_3 + 16);
_local_5 = eax;
_local_9 = li32((_local_2 - 4)) /*FlasCC (Alchemy)*/ ;
_local_4 = CModule.readString(_local_5, _local_9);
if (_local_7 != 0)
{
_local_3 = (_local_3 - 16);
si32(_local_7, _local_3); //FlasCC (Alchemy)
ESP = _local_3;
F_IDAlloc();
_local_3 = (_local_3 + 16);
};
if (_local_5 != 0)
{
_local_3 = (_local_3 - 16);
si32(_local_5, _local_3); //FlasCC (Alchemy)
ESP = _local_3;
F_idalloc();
_local_3 = (_local_3 + 16);
};
var _local_10 = _local_4;
_local_3 = _local_2;
ESP = _local_3;
return (_local_10);
}
}//package com.bilibili.interfaces[/mw_shl_code]
[mw_shl_code=actionscript3,true]public function getSign_v2(_arg_1:String, _arg_2:int):String
{
var _local_12:*;
var _local_3:int;
var _local_5 = null;
var _local_6:int;
var _local_11:int;
var _local_8:int;
var _local_10:int;
var _local_9:int;
var _local_4:int = ESP;
_local_3 = _local_4;
_local_4 = (_local_4 - 48);
_local_6 = _arg_2;
if (_local_6 >= 5)
{
_local_12 = _arg_1;
}
else
{
_local_8 = (L__2E_str2 + (_local_6 << 4));
_local_9 = 16;
_local_10 = (_local_3 - 37);
ESP = (_local_4 & -16);
_local_6 = CModule.mallocString(_arg_1);
_local_11 = _arg_1.length;
do
{
var _local_7:int = (_local_8 - _local_9);
_local_7 = li8((_local_7 + 16)) /*FlasCC (Alchemy)*/ ;
_local_4 = (_local_4 - 16);
si32(_local_7, (_local_4 + 4)); //FlasCC (Alchemy)
si32(_local_10, _local_4); //FlasCC (Alchemy)
ESP = _local_4;
F_sprintf();
_local_4 = (_local_4 + 16);
_local_9 = (_local_9 + -1);
_local_10 = (_local_10 + 2);
} while (_local_9 != 0);
_local_4 = (_local_4 - 16);
_local_7 = (_local_3 - 4);
si32(_local_7, (_local_4 + 12)); //FlasCC (Alchemy)
_local_7 = (_local_3 - 37);
si32(_local_7, (_local_4 + 8)); //FlasCC (Alchemy)
si32(_local_11, (_local_4 + 4)); //FlasCC (Alchemy)
si32(_local_6, _local_4); //FlasCC (Alchemy)
ESP = _local_4;
F_get_sign();
_local_4 = (_local_4 + 16);
_local_10 = eax;
_local_7 = li32((_local_3 - 4)) /*FlasCC (Alchemy)*/ ;
_local_5 = CModule.readString(_local_10, _local_7);
if (_local_6 != 0)
{
_local_4 = (_local_4 - 16);
si32(_local_6, _local_4); //FlasCC (Alchemy)
ESP = _local_4;
F_idalloc();
_local_4 = (_local_4 + 16);
};
if (_local_10 != 0)
{
_local_4 = (_local_4 - 16);
si32(_local_10, _local_4); //FlasCC (Alchemy)
ESP = _local_4;
F_idalloc();
_local_4 = (_local_4 + 16);
};
_local_12 = _local_5;
};
_local_4 = _local_3;
ESP = _local_4;
return (_local_12);
}
}//package com.bilibili.interfaces[/mw_shl_code]
可以看到,二者代碼非常相似,而且光看代碼無(wú)法找到有用的信息,那么就得想辦法去調(diào)試了
3.目前我只知道的辦法是:使用JPEXS反編譯軟件來(lái)修改SWF代碼(插Log),然后通過(guò)Fiddler劫持替換SWF,通過(guò)顯示Log信息來(lái)進(jìn)行調(diào)試?
要顯示log信息就得安裝debug版本的flash
http://www.adobe.com/support/flashplayer/debug_downloads.html
?
為方便閱讀日志信息可以安裝Cygwin
?
具體步驟我也是參考了http://blog.csdn.net/hot_vc/article/details/50600717這篇文章?
————————————————————————————————————————————————————————————————————————————
將SWF載入JPEXS
?
要想修改SWF的源碼就得去修改PCODE,第一次接觸這種也不是很懂,覺得有點(diǎn)類似于C#的IL代碼
通過(guò)AS3代碼和PCODE代碼的一一進(jìn)行對(duì)比,還是能找到一些規(guī)律的
為了查看代碼中變量值,用到以下代碼
[mw_shl_code=javascript,true]findpropstrict Qname(PackageNamespace(""),"trace")
getlocal 5
callpropvoid Qname(PackageNamespace(""),"trace") 1[/mw_shl_code]
這個(gè)代碼就相當(dāng)于trace(_loc5_);
修改保存后利用Fiddler來(lái)劫持替換我們的SWF
?
這樣Cygwin就能輸出我們想要看到的結(jié)果了。
其中有些變量的值是地址,而不是數(shù)據(jù),為了讀取地址中的數(shù)據(jù),利用到了這句代碼CModule.readString(地址,讀取長(zhǎng)度);
按照原PCODE的格式,寫出插LOG時(shí)的PCODE
[mw_shl_code=asm,true]pushint 60
setlocal 8
getlex Qname(PackageNamespace("com.bilibili.interfaces"),"CModule")
getlocal 7
getlocal 8
callproperty Qname(PackageNamespace(""),"readString") 2
coerce_s
setlocal 5
findpropstrict Qname(PackageNamespace(""),"trace")
getlocal 5
callpropvoid Qname(PackageNamespace(""),"trace") 1[/mw_shl_code]
此代碼相當(dāng)于
_loc8_:int = 60;
_loc5_:* = CModule.readString(_loc7_,_loc8_);
trace(_loc5_);
?
4.其實(shí)關(guān)鍵算法在F_get_sign()中,因?yàn)閺腇_get_sign()函數(shù)中出來(lái)后,eax中就已經(jīng)存放帶著sign的視頻URL的地址了。
F_get_sign()函數(shù)過(guò)于復(fù)雜,總之通過(guò)不斷地插這兩種Log查看變量信息,最終找到了算法?
?
由這個(gè)地方可以看出是MD5,還有一個(gè)位置能夠準(zhǔn)確地查看到進(jìn)行MD5處理的數(shù)據(jù)(已經(jīng)忘了.....)
算法如下:
五種清晰度
qn=16,quality=1
qn=32,quality=5
qn=48,quality=2
qn=64,quality=2
qn=80,quality=3
qn=112,quality=4
三種類型的視頻bili2,bangumi,movie
bili2:
time = F_clock_gettime();//相當(dāng)于取一個(gè)時(shí)間隨機(jī)數(shù)
sign = MD5(“cid=” + cid + “&player=1&qn=112&quality=4&ts=” + time + “1c15888dc316e05a15fdd0a02ed6584f”)
url = “https://interface.bilibili.com/playurl?player=1&qn=112&cid=” + cid + “&quality=4&ts=” + time + “&sign=” + sign
bangumi:
time = F_clock_gettime();//相當(dāng)于取一個(gè)時(shí)間隨機(jī)數(shù)
sign = MD5(“cid=” + cid + “&module=bangumi” + “&player=1” + “&qn=112” + “&quality=4” + “&ts=” + time + “9b288147e5474dd2aa67085f716c560d”)
url = “https://bangumi.bilibili.com/player/web_api/playurl?cid=” + cid + “&player=1” + “&module=bangumi” + “&qn=112” + “&quality=4&ts=” + time + “&sign=” + sign
movie:
time = F_clock_gettime();//相當(dāng)于取一個(gè)時(shí)間隨機(jī)數(shù)
sign = MD5(“cid=” + cid + “&module=movie” + “&player=1” + “&qn=112” + “&quality=4” + “&ts=” + time + “9b288147e5474dd2aa67085f716c560d”)
url = “https://bangumi.bilibili.com/player/web_api/playurl?cid=” + cid + “&player=1” + “&module=movie” + “&qn=112” + “&quality=4&ts=” + time + “&sign=” + sign
也就只分析到了這里?
順便說(shuō)下,有些tx.acgvideo.com開頭的視頻無(wú)法下載是因?yàn)榉?wù)器檢查了Refer,只要在協(xié)議頭里面加入Refer:[media]https://static.hdslb.com/play.swf[/media],就能下載了
水平有限,分析若有什么錯(cuò)誤,大家看著辦吧
歡迎大家在評(píng)論區(qū)留下你的意見。謝謝 諸葛商學(xué)院
家好,今天小編就以B站為例,帶大家爬取視頻,學(xué)會(huì)之后你也能爬取你想要的視頻!或不多說(shuō),上正文
爬蟲用的好,牢飯吃的早!
本文僅作知識(shí)分享,切勿用于違法行為!
git@github.com:inspurer/PythonSpider.git
或者直接下載:https://github.com/inspurer/PythonSpider/tree/master/bilibili
隨便打開一個(gè)b站的界面,比如
將url復(fù)制到代碼中去,運(yùn)行代碼,稍等一會(huì)兒,上述圖中的視頻就被下載下來(lái)了。
按f12瀏覽器開發(fā)者工具 ,通過(guò)一番審查,我們定位到視頻的url在網(wǎng)頁(yè)源代碼的位置如下:
window.__playinfo__={
"from":"local",
"result":"suee",
"quality":32,
"format":"flv480",
"timelength":408884,
"accept_format":"flv720,flv480,flv360",
"accept_description":["高清 720P","清晰 480P","流暢 360P"],
"accept_quality":[64,32,15],
"video_codecid":7,
"video_project":true,
"seek_param":"start",
"seek_type":"offset",
"durl":[{"order":1,"length":408884,"size":42782550,"ahead":"EhA=","vhead":"AWQAHv/hAB5nZAAerNlA2D3n//AoACfxAAADAAEAAAMAMA8WLZYBAAVo6+zyPA==",
"url":"http://upos-hz-mirrorkodo.acgvideo.com/upgcxcode/48/61/45596148/45596148-1-32.flv?e=ig8euxZM2rNcNbRa7b4VhoMz7WhjhwdEto8g5X10ugNcXBlqNxHxNEVE5XREto8KqJZHUa6m5J0SqE85tZvEuENvNC8xNEVE9EKE9IMvXBvE2ENvNCImNEVEK9GVqJIwqa80WXIekXRE9IB5QK==&deadline=1543136253&dynamic=1&gen=playurl&oi=1862807981&os=kodo&platform=pc&rate=176800&trid=69ea1a81ac21448f9e2189ef479a2d6d&uipk=5&uipv=5&um_deadline=1543136253&um_sign=c479f3fd3075b359d0a04e5eb584ac55&upsig=1c05ca3838af92d2c1411cf3000e8345http://upos-hz-mirrorkodo.acgvideo.com/upgcxcode/48/61/45596148/45596148-1-32.flv?e=ig8euxZM2rNcNbRa7b4VhoMz7WhjhwdEto8g5X10ugNcXBlqNxHxNEVE5XREto8KqJZHUa6m5J0SqE85tZvEuENvNC8xNEVE9EKE9IMvXBvE2ENvNCImNEVEK9GVqJIwqa80WXIekXRE9IB5QK==&deadline=1543136253&dynamic=1&gen=playurl&oi=1862807981&os=kodo&platform=pc&rate=176800&trid=69ea1a81ac21448f9e2189ef479a2d6d&uipk=5&uipv=5&um_deadline=1543136253&um_sign=c479f3fd3075b359d0a04e5eb584ac55&upsig=1c05ca3838af92d2c1411cf3000e8345","backup_url":["http://upos-hz-mirrorcos.acgvideo.com/upgcxcode/48/61/45596148/45596148-1-32.flv?um_deadline=1543136253&platform=pc&rate=176800&oi=1862807981&um_sign=c479f3fd3075b359d0a04e5eb584ac55&gen=playurl&os=cos&trid=69ea1a81ac21448f9e2189ef479a2d6d"]}]}
最后的url就是我們想要的結(jié)果。
如果在瀏覽器中查找不方便的話,我們可以把通過(guò)代碼把網(wǎng)頁(yè)源碼輸出到本地
response = requests.get(url='https://www.bilibili.com/video/av26522634', headers= self.getHtmlHeaders)
print(response.status_code)
if response.status_code == 200:
print(response.text)
為了偽裝成瀏覽器,我們需要在reqests添加Headers
這個(gè)Headers需要我們?nèi)g覽器中手動(dòng)獲取
切換到NetWork標(biāo)簽下,再選擇Headers,
self.getHtmlHeaders={
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8',
'Accept-Encoding': 'gzip, deflate, br',
'Accept-Language': 'zh-CN,zh;q = 0.9'
}
這里只選擇了幾個(gè)關(guān)鍵的
根據(jù)上一步分析,我們得到了網(wǎng)頁(yè)的源碼,并在源碼中定位到了視頻地址,接下來(lái),我們就用代碼自動(dòng)獲取這個(gè)地址了
#用正則、json得到視頻url;用pq失敗后的無(wú)奈之舉
pattern = r'\<script\>window\.__playinfo__=(.*?)\</script\>'
result = re.findall(pattern, html)[0]
temp = json.loads(result)
#temp['durl']是一個(gè)列表,里面有很多字典
#video_url = temp['durl']
for item in temp['data']['durl']:
if 'url' in item.keys():
video_url = item['url']
順便獲取下視頻的名字:
#用pq解析得到視頻標(biāo)題
doc = pq(html)
video_title = doc('#viewbox_report > h1 > span').text()然后組合返回下:
然后組合返回下:
return{
'title': video_title,
'url': video_url
}
通過(guò)在開發(fā)者工具中搜索關(guān)鍵詞,比如上面得到的視頻url,我們可以定位到在瀏覽器中真正下載視頻的請(qǐng)求在哪
然后把它的Headers添加到reqests中,就可以下載視頻了
with open(filename, "wb") as f:
f.write(requests.get(url=url, headers=self.downloadVideoHeaders, stream=True, verify=False).content)
你下載的視頻在本地播放不了,請(qǐng)不要試圖修改源代碼中保存文件的格式由.flv改成.mp4,因?yàn)閎站的視頻本來(lái)就是flv格式的,需要用特殊的視頻播放器播放,這里推薦一個(gè)無(wú)毒無(wú)害的KMPlayer,鏈接:https://pan.baidu.com/s/1O4-Uia04Vm-jbUjyrVWfkw 提取碼:4l11
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