【Python】爬取B站视频

鱼C-小甲鱼

2021年02月05日 08:45

本帖来自#鱼C论坛# Python 板块实习斑竹 qiuyouzhi，持续优化中哦！

(https://fishc.com.cn/thread-190000-1-1.html)

使用 B 站提供的 API 完成。

很好用，连 XPath 都不用，直接从 json 数据里面找就行了。

目前十分的简陋，想要什么功能（下方留言），我尽量努力。

TODO:

添加 GUI 界面
改进速度！！太慢了点（目前不清楚原因，大家可以帮我看看
添加下载进度条（目前想法是放在 GUI 里面）

源码：

 代码块
Python
自动换行
复制代码
from requests import get, post

class Download_Bilibili_Video:    
    def open_url(self, url):
        headers = {&#39;User-Agent&#39;: &#39;Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.104 Safari/537.36&#39;,
                   &#39;Referer&#39;: &#39;https://www.bilibili.com/&#39;}
        res = get(url, headers = headers)
        res.raise_for_status()
        res.encoding = res.apparent_encoding
        return res

    def BV_to_AV(self, bv):
        # 方法：BV1j4411W7F7
        if bv.isdigit():
            return bv
        bv = list(bv[2:])
        keys = {&#39;1&#39;: 13, &#39;2&#39;: 12, &#39;3&#39;: 46, &#39;4&#39;: 31, &#39;5&#39;: 43, &#39;6&#39;: 18, &#39;7&#39;: 40, &#39;8&#39;: 28, &#39;9&#39;: 5,
                &#39;A&#39;: 54, &#39;B&#39;: 20, &#39;C&#39;: 15, &#39;D&#39;: 8, &#39;E&#39;: 39, &#39;F&#39;: 57, &#39;G&#39;: 45, &#39;H&#39;: 36, &#39;J&#39;: 38, &#39;K&#39;: 51, &#39;L&#39;: 42, &#39;M&#39;: 49, &#39;N&#39;: 52, &#39;P&#39;: 53, &#39;Q&#39;: 7, &#39;R&#39;: 4, &#39;S&#39;: 9, &#39;T&#39;: 50, &#39;U&#39;: 10, &#39;V&#39;: 44, &#39;W&#39;: 34, &#39;X&#39;: 6, &#39;Y&#39;: 25, &#39;Z&#39;: 1,
                &#39;a&#39;: 26, &#39;b&#39;: 29, &#39;c&#39;: 56, &#39;d&#39;: 3, &#39;e&#39;: 24, &#39;f&#39;: 0, &#39;g&#39;: 47, &#39;h&#39;: 27, &#39;i&#39;: 22, &#39;j&#39;: 41, &#39;k&#39;: 16, &#39;m&#39;: 11, &#39;n&#39;: 37, &#39;o&#39;: 2, &#39;p&#39;: 35, &#39;q&#39;: 21, &#39;r&#39;: 17, &#39;s&#39;: 33, &#39;t&#39;: 30, &#39;u&#39;: 48, &#39;v&#39;: 23, &#39;w&#39;: 55, &#39;x&#39;: 32, &#39;y&#39;: 14, &#39;z&#39;: 19}
        for i in range(len(bv)):
            bv[i] = keys[bv[i]]
        bv[0] *= (58 ** 6)
        bv[1] *= (58 ** 2)
        bv[2] *= (58 ** 4)
        bv[3] *= (58 ** 8)
        bv[4] *= (58 ** 5)
        bv[5] *= (58 ** 9)
        bv[6] *= (58 ** 3)
        bv[7] *= (58 ** 7)
        bv[8] *= 58
        return str((sum(bv) - 100618342136696320) ^ 177451812)

    def get_video_info(self, aid, cid):
        url = f&#34;https://api.bilibili.com/x/web-interface/view?aid={aid}&amp;cid={cid}&#34;
        res = self.open_url(url).json()
        # 没想好这部分怎么用
        if res[&#39;message&#39;] == &#39;0&#39;:
            res = res[&#39;data&#39;]
            info = {}
            info[&#39;title&#39;] = res[&#39;title&#39;]
            info[&#39;intro&#39;] = res[&#39;desc&#39;]
            info[&#39;author&#39;] = res[&#39;owner&#39;][&#39;name&#39;]
            info[&#39;stat&#39;] = res[&#39;stat&#39;]
            return info
        return False

    def get_cid(self, aid):
        res = self.open_url(f&#34;https://api.bilibili.com/x/player/pagelist?aid={aid}&amp;jsonp=jsonp&#34;).json()
        if res[&#39;message&#39;] == &#39;0&#39;:
            cid = res[&#34;data&#34;][0][&#34;cid&#34;]
            return cid
        return False

    def download_video(self, aid, cid, filename):
        res = self.open_url(f&#34;https://api.bilibili.com/x/player/playurl?avid={aid}&amp;cid={cid}&amp;qn=64&#34;).json()
        url = res[&#34;data&#34;][&#34;durl&#34;][0][&#34;url&#34;]
        print(f&#34;准备下载{filename}...&#34;)
        f = open(filename, &#34;ab&#34;)
        print(&#34;开始下载...&#34;)
        video = self.open_url(url)
        f.write(video.content)
        print(&#34;下载已完成！&#34;)

    def main(self):
        bv = input(&#34;请输入视频BV或AV号：&#34;)
        aid = self.BV_to_AV(bv)
        cid = self.get_cid(aid)
        if not cid:
            print(&#34;您输入的BV或AV号有误！&#34;)
            return False
        info = self.get_video_info(aid, cid)
        self.download_video(aid, cid, info[&#39;title&#39;] + &#34;.flv&#34;)
        return True

DBV = Download_Bilibili_Video()
if __name__ == &#34;__main__&#34;:
    DBV.main()复制成功