如何在asp.net中流式传输视频内容?

时间:2010-04-22 01:26:43

标签: c# .net asp.net streaming video-streaming

我有以下代码下载视频内容:

WebRequest wreq = (HttpWebRequest)WebRequest.Create(url);
using (HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse())
using (Stream mystream = wresp.GetResponseStream())
{
  using (BinaryReader reader = new BinaryReader(mystream))
  {
    int length = Convert.ToInt32(wresp.ContentLength);
    byte[] buffer = new byte[length];
    buffer = reader.ReadBytes(length);

    Response.Clear();
    Response.Buffer = false;
    Response.ContentType = "video/mp4";
    //Response.BinaryWrite(buffer);
    Response.OutputStream.Write(buffer, 0, buffer.Length);
    Response.End();
  }
}

但问题是整个文件在播放前下载。如何进行流式处理和播放,因为它仍在下载?或者由客户/接收器应用程序来管理?

3 个答案:

答案 0 :(得分:22)

您正在将整个文件读入单个缓冲区,然后立即发送整个字节数组。

您应该在while循环中读入较小的缓冲区。

例如:

byte[] buffer = new byte[4096];

while(true) {
    int bytesRead = myStream.Read(buffer, 0, buffer.Length);
    if (bytesRead == 0) break;
    Response.OutputStream.Write(buffer, 0, bytesRead);
}

答案 1 :(得分:2)

你看过Smooth Streaming吗?

查看示例代码here

答案 2 :(得分:2)

这对您更有效,特别是如果您需要从服务器上的文件流式传输视频,或者甚至此文件托管在其他服务器上

文件在您的服务器上:

context.Response.BinaryWrite(File.ReadAllBytes(HTTPContext.Current.Server.MapPath(_video.Location)));

外部服务器上的文件:

var wc = new WebClient();
    context.Response.BinaryWrite(wc.DownloadData(new Uri("http://mysite/video.mp4")));