让你在线看视频也能达到多线程下载的速度

Video Funnel - 让你在线看视频也能达到多线程下载的速度

马上使用：

从 PyPI 安装：

$ pip(3) install --user video_funnel
# or
$ sudo pip(3) install video_funnel

启动 video_funnel 的服务器：

$ vf http://tulip.ink/test.mp4
======== Running on http://0.0.0.0:8080 ========
(Press CTRL+C to quit)

用 mpv 播放：

$ mpv http://localhost:8080

动机：

众所周知，百度网盘之类产品的视频在线播放非常模糊，下载吧又限速，于是我写了 aiodl 这个下载器，通过 EX-百度云盘获取的直链来“多线程”下载。可是每次都要下载完才能看又十分不爽，直接用 mpv 之类的播放器播放直链又因为限速的原因根本没法看，遂有了本项目。

实现思路：

先将视频按照一定大小分块。块的大小根据视频的清晰度而异，以下载完一个块后视频可以播放为准。可通过命令行参数 --block-size/-b 来指定，默认为 8MB。
对于上一步中的一个块，再次分块——为区别改叫切片，启动多个协程来下载这些切片，以实现“多线程”提速的目的。块和切片大小一起决定了有多少个连接在同时下载。切片的大小通过 --piece-size/-p 来指定，默认为 1MB。
一个块中的切片全部下载完后，就可以将数据传给播放器了。当播放器播放这一块的时候，回到第 2 步下载下一块数据。为节省内存，设置了在内存中最多存在 2 个下载完而又没有传给播放器的块。

一些细节：

该如何把数据传给播放器呢？我最初的设想是通过标准输出，这样简单好写。但 stdio 是无法 seek 的，这就意味着你只能从视频的开头看起，无法快进 :P 如你所见，现在的解决方案是用 HTTP 协议与播放器传输数据。需要快进的时候播放器发送 HTTP Range 请求，video_funnel 将请求中的范围经过分块、切片后“多线程”下载。但这样就又带来了两个问题：
1. 需要播放器支持从 URL 播放。mplayer、mpv 之类的命令行播放器大多都支持，但一些 Windows 的播放器就不得而知了 :P 不过可以使用 HTML 的 video 标签在浏览器播放。
2. 怎么就没有处理 Range 请求的包啊，自己处理很麻烦的好吗～
由于下载的部分是用异步 IO 写的，与播放器交互的服务器部分就不能使用 Flask 之类阻塞的框架了，幸好 aiohttp 居然同时支持客户端和服务端。
说起来简单，实际写起来处处是坑啊 :(

参加 https://tanronggui.xyz/t/405569

GitHub: https://github.com/cshuaimin/video-funnel

cnaol

2018-01-07 22:55:57 +08:00

@CSM
> PS F:\myproject> pip install --user video_funnel
Collecting video_funnel
Using cached video_funnel-0.0.3.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\UrAir\AppData\Local\Temp\pip-build-v519sou0\video-funnel\setup.py", line 29, in <module>
'vf = video_funnel.__main__:main'
File "c:\users\urair\appdata\local\programs\python\python36\lib\distutils\core.py", line 108, in setup
_setup_distribution = dist = klass(attrs)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\dist.py", line 315, in __init__
self.fetch_build_eggs(attrs['setup_requires'])
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\dist.py", line 361, in fetch_build_eggs
replace_conflicting=True,
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\pkg_resources\__init__.py", line 850, in resolve
dist = best[req.key] = env.best_match(req, ws, installer)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\pkg_resources\__init__.py", line 1122, in best_match
return self.obtain(req, installer)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\pkg_resources\__init__.py", line 1134, in obtain
return installer(requirement)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\dist.py", line 429, in fetch_build_egg
return cmd.easy_install(req)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\command\easy_install.py", line 653, in easy_install
not self.always_copy, self.local_index
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 636, in fetch_distribution
dist = find(requirement)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 617, in find
dist.download_location = self.download(dist.location, tmpdir)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 566, in download
found = self._download_url(scheme.group(1), spec, tmpdir)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 805, in _download_url
return self._attempt_download(url, filename)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 811, in _attempt_download
headers = self._download_to(url, filename)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 710, in _download_to
fp = self.open_url(strip_fragment(url))
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 747, in open_url
return open_with_auth(url, self.opener)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 948, in _socket_timeout
return func(*args, **kwargs)
File "c:\users\urair\appdata\local\programs\python\python36\lib\site-packages\setuptools\package_index.py", line 1067, in open_with_auth
fp = opener(request)
File "c:\users\urair\appdata\local\programs\python\python36\lib\urllib\request.py", line 223, in urlopen
return opener.open(url, data, timeout)
File "c:\users\urair\appdata\local\programs\python\python36\lib\urllib\request.py", line 526, in open
response = self._open(req, data)
File "c:\users\urair\appdata\local\programs\python\python36\lib\urllib\request.py", line 544, in _open
'_open', req)
File "c:\users\urair\appdata\local\programs\python\python36\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "c:\users\urair\appdata\local\programs\python\python36\lib\urllib\request.py", line 1361, in https_open
context=self._context, check_hostname=self._check_hostname)
File "c:\users\urair\appdata\local\programs\python\python36\lib\urllib\request.py", line 1321, in do_open
r = h.getresponse()
File "c:\users\urair\appdata\local\programs\python\python36\lib\http\client.py", line 1331, in getresponse
response.begin()
File "c:\users\urair\appdata\local\programs\python\python36\lib\http\client.py", line 297, in begin
version, status, reason = self._read_status()
File "c:\users\urair\appdata\local\programs\python\python36\lib\http\client.py", line 258, in _read_status
line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
File "c:\users\urair\appdata\local\programs\python\python36\lib\socket.py", line 586, in readinto
return self._sock.recv_into(b)
File "c:\users\urair\appdata\local\programs\python\python36\lib\ssl.py", line 1009, in recv_into
return self.read(nbytes, buffer)
File "c:\users\urair\appdata\local\programs\python\python36\lib\ssl.py", line 871, in read
return self._sslobj.read(len, buffer)
File "c:\users\urair\appdata\local\programs\python\python36\lib\ssl.py", line 631, in read
v = self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in C:\Users\UrAir\AppData\Local\Temp\pip-build-v519sou0\video-funnel\