如何使用Elixir / HTTPoison或Hackney获得视频流？ [英] How to get a video flow with Elixir/HTTPoison or Hackney?
问题描述
我正在尝试使用Elixir / HTTPoison从凸轮获取流并将其转储到文件中。
网址为 xxxx / axis-cgi / mjpg / video.cgi？duration = 1& resolution = 320x240
I'm trying to get a stream from a cam using Elixir / HTTPoison and dump it into a file. Url is x.x.x.x/axis-cgi/mjpg/video.cgi?duration=1&resolution=320x240
使用网址在DHC（Chrome插件）中，我可以具有以下内容：
Using the url in DHC (Chrome addon), i can have the following:
响应200 OK
Response 200 OK
HEADERS缓存控制：无缓存语法：no-cache过期：12月01日，星期四
1994 16:00:00 GMT连接：close内容类型：
multipart / x-mixed-更换; boundary = myboundary X时间偏移：
62044.312573 pretty完成请求标头接受： / 接受编码：gzip，deflate，sdch
接受语言：fr-FR，fr ; q = 0.8，en-US; q = 0.6，en; q = 0.4
内容类型：application / xml用户代理：Mozilla / 5.0（Windows NT
6.1; WOW64）AppleWebKit / 537.36 （KHTML，例如Gecko）Chrome / 52.0.2743.116 Safari / 537.36注意：XHR自动添加
标头，例如Accept，Accept-Language，Cookie，User-Agent等。
HEADERS Cache-Control: no-cache Pragma: no-cache Expires: Thu, 01 Dec 1994 16:00:00 GMT Connection: close Content-Type: multipart/x-mixed-replace; boundary=myboundary X-Time-Offset: 62044.312573 pretty COMPLETE REQUEST HEADERS Accept: / Accept-Encoding: gzip, deflate, sdch Accept-Language: fr-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4 Content-Type: application/xml User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36 Note: XHR automatically adds headers like Accept, Accept-Language, Cookie, User-Agent, etc.
原始的格式显示了很多二进制jpeg图像，并用-myboundary 东西隔开了。
Raw formatting the body is showing me a lot of binary jpeg image separated by a --myboundary thing.
-myboundary
--myboundary
Content-Type：image / jpeg
Content-Type: image/jpeg
Content-Length：11848
Content-Length: 11848
？JFIF ？ W u]7W u]7 ？ 2 ̎TY C
����JFIF�� W�u]7W�u]7�� �2�̎TY"��C
现在，我要
test "request headers from cam" do
options = [hackney: [basic_auth: {"login","password"}]]
{:ok, %HTTPoison.AsyncResponse{id: id}} = HTTPoison.get "http://x.x.x.x/axis-cgi/mjpg/video.cgi?duration=1&resolution=320x240",[], [stream_to: self, recv_timeout: :infinity, hackney: options]
assert_receive %HTTPoison.AsyncStatus{id: ^id, code: 200}, 1_000
end
我确实有以下答复，
1) test request headers from cam (NewsequenceTest)
test/newsequence_test.exs:9
No message matching %HTTPoison.AsyncStatus{id: ^id, code: 200} after 1000ms.
The following variables were pinned:
id = #Reference<0.0.3.125>
Process mailbox:
%HTTPoison.AsyncStatus{code: 401, id: #Reference<0.0.3.125>}
%HTTPoison.AsyncHeaders{headers: [{"Date", "Wed, 31 Aug 2016 06:47:00 GMT"}, {"Accept-Ranges", "bytes"}, {"Connection", "close"}, {"WWW-Authenticate", "Digest realm=\"AXIS_ACCC8E545922\", nonce=\"0000fa64Y50235919055a42f91d3dea744b10d2dab9653\", stale=FALSE, qop=\"auth\""}, {"WWW-Authenticate", "Basic realm=\"AXIS_ACCC8E545922\""}, {"Content-Length", "189"}, {"Content-Type", "text/html; charset=ISO-8859-1"}], id: #Reference<0.0.3.125>}
%HTTPoison.AsyncChunk{chunk: "<HTML><HEAD><TITLE>401 Unauthorized</TITLE></HEAD>\n<BODY><H1>401 Unauthorized</H1>\nYour client does not have permission to get URL /axis-cgi/mjpg/video.cgi from this server.\n</BODY></HTML>\n", id: #Reference<0.0.3.125>}
%HTTPoison.AsyncEnd{id: #Reference<0.0.3.125>}
stacktrace:
test/newsequence_test.exs:12: (test)
我确实尝试了基本身份验证具有相同的结果。
I did try without basic auth with the same result.
我还不知道此身份验证错误是怎么回事。
当然，我误解了一些东西，有人可以启发我吗？
I don't understand yet what it's happening with this auth error. Sure i misunderstod something, can someone please enlighten me on this subject ?
亲切的问候，
Pierre
推荐答案
所以这里的问题是代码正在调用：
So the problem here was that the code was calling:
HTTPoison.get(..., [], [..., hackney: [hackney: [basic_auth: {"login","password"}]]])
代替：
HTTPoison.get(..., [], [..., hackney: [basic_auth: {"login","password"}]])
这会导致 hackney 忽略它们，因为它试图获取
which was causing hackney to ignore them as it was trying to fetch opts[:hackney][:basic_auth] etc which were all nil.
解决方法是替换：
options = [hackney: [basic_auth: {"login","password"}]]
with
options = [basic_auth: {"login","password"}]
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