asp.net(C#)制作视频网站出现大视频不能播放，小视频可以播放，求解决 - 编程论坛

我在制作视频网站（VS软件做的）用微软自带的视频代码在运行时 849k的avi视频可以播放，但是3G的avi视频不可以播放，求解决。一下是微软自带的视频代码
<object classid="CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95" codebase="http://activex.,1,52,701"
    height="500" id="nstv" style="border: 7px none rgb(192,192,192); LEFT: 0px; TOP: 0px; width: 123%;"
    type="application/x-oleobject"
          standby="Loading Microsoft Windows Media Player components...">
  <param name="AudioStream" value="-1"/>
  <param name="AutoSize" value="0"/>
  <param name="AutoStart" value="-1"/>
  <param name="AnimationAtStart" value="0"/>
  <param name="AllowScan" value="-1"/>
  <param name="AllowChangeDisplaySize" value="-1"/>
  <param name="AutoRewind" value="0"/>
  <param name="Balance" value="0"/>
  <param name="BaseURL" value=""/>
  <param name="BufferingTime" value="6"/>
  <param name="CaptioningID" value=""/>
  <param name="ClickToPlay" value="-1"/>
  <param name="CursorType" value="0"/>
  <param name="CurrentPosition" value="-1"/>
  <param name="CurrentMarker" value="0"/>
  <param name="DefaultFrame" value=""/>
  <param name="DisplayBackColor" value="0"/>
  <param name="DisplayForeColor" value="16777215"/>
  <param name="DisplayMode" value="0"/>
  <param name="DisplaySize" value="0"/>
  <param name="Enabled" value="-1"/>
  <param name="EnableContextMenu" value="-1"/>
  <param name="EnablePositionControls" value="-1"/>
  <param name="EnableFullScreenControls" value="0"/>
  <param name="EnableTracker" value="-1"/>
  <param name="Filename" value='<%=Session["path"]%>'/>
  <param name="InvokeURLs" value="-1"/>
  <param name="Language" value="-1"/>
  <param name="Mute" value="0"/>
  <param name="PlayCount" value="1"/>
  <param name="PreviewMode" value="0"/>
  <param name="Rate" value="1"/>
  <param name="SAMILang" value=""/>
  <param name="SAMIStyle" value=""/>
  <param name="SAMIFileName" value=""/>
  <param name="SelectionStart" value="-1"/>
  <param name="SelectionEnd" value="-1"/>
  <param name="SendOpenStateChangeEvents" value="-1"/>
  <param name="SendWarningEvents" value="-1"/>
  <param name="SendErrorEvents" value="-1"/>
  <param name="SendKeyboardEvents" value="0"/>
  <param name="SendMouseClickEvents" value="0"/>
  <param name="SendMouseMoveEvents" value="0"/>
  <param name="SendPlayStateChangeEvents" value="-1"/>
  <param name="ShowCaptioning" value="0"/>
  <param name="ShowControls" value="-1"/>
  <param name="ShowAudioControls" value="-1"/>
  <param name="ShowDisplay" value="0"/>
  <param name="ShowGotoBar" value="0"/>
  <param name="ShowPositionControls" value="-1"/>
  <param name="ShowStatusBar" value="1"/>
  <param name="ShowTracker" value="-1"/>
  <param name="TransparentAtStart" value="-1"/>
  <param name="VideoBorderWidth" value="0"/>
  <param name="VideoBorderColor" value="0"/>
  <param name="VideoBorder3D" value="0"/>
  <param name="Volume" value="-60"/>
  <param name="WindowlessVideo" value="0"/>
</object>