我使用NetStream,NetConnection和Video对象播放mp4文件,该文件使用http在Web服务器上托管。
mp4文件网址例如是:http://xx.xx.xx.xx/file.mp4
这是一个AIR应用程序,相关代码粘贴在下面:
var url:String = <some http url>;
connect_nc = new NetConnection();
connect_nc.connect(null);
stream_ns = new NetStream(connect_nc);
var ns_object:Object = new Object();
ns_object.onPlayStatus = ns_onPlayStatus;
stream_ns.client = ns_object;
videoMP4.attachNetStream(stream_ns);
stream_ns.bufferTime = 1.0 // 1 sec
stream_ns.addEventListener(NetStatusEvent.NET_STATUS, onNetStatusEventHandler);
stream_ns.play(url);
此代码在MAC OS X上运行时有效。但在Windows XP上运行时它不起作用。我收到错误:
NetStream.Play.StreamNotFound
我也尝试在同一台Windows XP主机上使用VLC播放器播放URL。该URL有效,因为VLC可以播放它。
在我的特定情况下,http URL由Win 7机器上的WMP 12(窗口媒体播放器12)托管,我正在使用WMP 12的媒体共享功能。
在进一步查看wireshark上的http流量后,这就是我找到的内容。
在运行adobe AIR应用程序的主机上运行wireshark之后,它似乎正在从
获取HTTP 406响应由WMP 12运行的服务器。
GET /WMPNSSv4/63903908/1_ezVGREUzQTA4LTdDQzQtNDJFMy1CNDVDLUZEMjA4MDE5OUM4Q30uMC44.mp4 HTTP/1.1
Host: 192.168.0.102:10243
User-Agent: Mozilla/5.0 (Windows; U; en) AppleWebKit/526.9+ (KHTML, like Gecko) AdobeAIR/1.5
Referer: app:/clicker.swf
x-flash-version: 10,0,12,36
Connection: Keep-Alive
Accept: text/xml, application/xml, application/xhtml+xml, text/html;q=0.9, text/plain;q=0.8, text/css, image/png, image/jpeg, image/gif;q=0.8, application/x-shockwave-flash, video/mp4;q=0.9, flv-application/octet-stream;q=0.8, video/x-flv;q=0.7, audio/mp4, application/futuresplash, */*;q=0.5
HTTP/1.1 406 Not Acceptable
Last-Modified: Mon, 19 Oct 2009 23:21:14 GMT
Server: Microsoft-HTTPAPI/2.0
Accept-Ranges: bytes
TransferMode.DLNA.ORG: Streaming
Date: Tue, 12 Jan 2010 22:52:48 GMT
Connection: close
Content-Length: 0
在MAC上:
它接收200 OK响应,这就是视频流的工作原理。
GET /WMPNSSv4/63903908/1_ezVGREUzQTA4LTdDQzQtNDJFMy1CNDVDLUZEMjA4MDE5OUM4Q30uMC44.m p4 HTTP/1.1
Host: 192.168.0.102:10243
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) AppleWebKit/526.9+ (KHTML, like Gecko) AdobeAIR/1.5.3
Referer: app:/clicker.swf
X-Flash-Version: 10,0,42,34
Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
Connection: keep-alive
HTTP/1.1 200 OK
Content-Length: 1524867
Content-Type: video/mp4
Last-Modified: Mon, 19 Oct 2009 23:21:14 GMT
Server: Microsoft-HTTPAPI/2.0
Accept-Ranges: bytes
TransferMode.DLNA.ORG: Streaming
Date: Tue, 12 Jan 2010 22:56:20 GMT
我在Windows XP和MAC版本之间的HTTP请求中看到的差异是Accept:Header。对于Windows案例,Accept:标头值是否错误,因为WMP 12拒绝该案例 http请求。
如果我在Win 7主机上运行adobe AIR应用程序,我会看到同样的失败。
我是否错误地使用了NetStream对象,或者它是WMP 12代码无法解析的错误 标题正确或它是一个flex错误,它生成一个不正确的接受:标题?
答案 0 :(得分:0)
我认为WMP 12错误地处理了请求中的“Accept”标头。如果它包含'q'(质量)参数,则WMP忽略此mime类型。如果WMP没有其他合适的mime类型,它将以406 Not Acceptable错误响应。
我在尝试在Chrome浏览器中显示DLNA图像时遇到了这个问题。
我使用curl实用程序发送带有不同标头的请求,以找出问题所在。
请求导致406 Not Acceptable error:
curl -v -o file.jpg -H "Accept: text/html,*/*,q=0.8" "http://127.0.0.1:10243/WMPNSSv4/3065481158/0_e0I5MzA1MTRELUYwMEEtNEQwRC1CQzg4LTg3NEI5QjQ4MDYyM30uMC5C.jpg"
GET /WMPNSSv4/3065481158/0_e0I5MzA1MTRELUYwMEEtNEQwRC1CQzg4LTg3NEI5QjQ4MDYyM30uMC5C.jpg HTTP/1.1
User-Agent: curl/7.31.0
Host: 127.0.0.1:10243
Accept: text/html,*/*;q=0.8
HTTP/1.1 406 Not Acceptable
Last-Modified: Tue, 21 May 2013 21:01:09 GMT
Server: Microsoft-HTTPAPI/2.0
Accept-Ranges: bytes
TransferMode.DLNA.ORG: Interactive
Date: Fri, 30 Aug 2013 09:10:32 GMT
Connection: close
Content-Length: 0
成功请求:
curl -v -o file.jpg -H "Accept: text/html,*/*" "http://127.0.0.1:10243/WMPNSSv4/3065481158/0_e0I5MzA1MTRELUYwMEEtNEQwRC1CQzg4LTg3NEI5QjQ4MDYyM30uMC5C.jpg"
GET /WMPNSSv4/3065481158/0_e0I5MzA1MTRELUYwMEEtNEQwRC1CQzg4LTg3NEI5QjQ4MDYyM30uMC5C.jpg HTTP/1.1
User-Agent: curl/7.31.0
Host: 127.0.0.1:10243
Accept: text/html,*/*
HTTP/1.1 200 OK
Content-Length: 2394679
Content-Type: image/jpeg
Last-Modified: Tue, 21 May 2013 21:01:09 GMT
Server: Microsoft-HTTPAPI/2.0
Accept-Ranges: bytes
TransferMode.DLNA.ORG: Interactive
Date: Fri, 30 Aug 2013 09:10:40 GMT