Windows Media Format SDK - Too much of Delay

Question

 

Hello,

 

I am using WMF SDK to create a video stream out of many BMPs(Live source). I am getting around 3-4 seconds of delay.

I am passing uncompressed packets using IWMWriter::WriteSample(...) method.

Is there any way to reduce the delay?

 

Following is my writer profile. After configuring following profile, I am setting the buffer window (using

SetBufferWindow) to 200 ms. Still the delay is around 3-4 seconds.

 

 

<profile version="589824"

storageformat="1"

name="test"

description="Streams: 1 video">

<streamconfig majortype="{73646976-0000-0010-8000-00AA00389B71}"

streamnumber="1"

streamname="Video Stream"

inputname="Video409"

bitrate="239000"

bufferwindow="1000"

reliabletransport="0"

decodercomplexity="SP"

rfc1766langid="en-us"

>

<videomediaprops maxkeyframespacing="20000000"

quality="60"/>

<wmmediatype subtype="{33564D57-0000-0010-8000-00AA00389B71}"

bfixedsizesamples="0"

btemporalcompression="1"

lsamplesize="0">

<videoinfoheader dwbitrate="239000"

dwbiterrorrate="0"

avgtimeperframe="333667">

<rcsource left="0"

top="0"

right="320"

bottom="240"/>

<rctarget left="0"

top="0"

right="320"

bottom="240"/>

<bitmapinfoheader biwidth="320"

biheight="240"

biplanes="1"

bibitcount="24"

bicompression="WMV3"

bisizeimage="0"

bixpelspermeter="0"

biypelspermeter="0"

biclrused="0"

biclrimportant="0"/>

</videoinfoheader>

</wmmediatype>

</streamconfig>

</profile>

&#0;

 

Thanks in advance.

 

Regards,

Samir

Answer 1

please reply..

Answer 2

It is not surprising to have 5-10 seconds of latency if you are using Windows media SDK. Microsoft is lagging way behind other technologies like VLC, Darwin etc.

Windows media 2003 server at any case cannot be used for live video broadcasting. I have tested different configuration, profiles etc and found Windows media is good only for recorded video broadcasting.

Dont expect any support from microsot guys as they dont have any answer for this. (I have tried enough to get an answer with no luck)

Answer 3

Are you writing to a NetworkSink and connecting from WMP?  If so, there is buffering in both the NetworkSink and the Player which is "delay". 
if you need low latency, use DirectShow/DirectX and the Windows Media Compressors

Answer 4

Hello TAV95

Thanks for replying.

Yes. I am writing to network sink. I have also written network reader. I have set buffer window to 200 ms in writer object. But after setting buffer the latency is around 4 seconds.

What exactly is windows media compressors?

I am new to directx. Using directshow/directx, can we achieve the writer and reader functionality? How directx/directshow different from Windows Media Format SDK?

Answer 5

TAV95 ?

Regards
Ratheesh Kalarot
http://www.cs.auckland.ac.nz/~ratheesh/

Answer 6

This forum is for Media Foundation Development.

See this post at the top of the forum for resources for other
multimedia forums and newsgroups:

http://social.msdn.microsoft.com/Forums/en-US/mediafoundationdevelopment/thread/c78d9b6e-2da2-42d9-8cde-606a498522fb

For Windows Vista questions, please post in the appropriate forum here:

http://social.answers.microsoft.com/Forums/en-US/category/windowsvista/

For Windows XP questions, use one of these forums or newsgroups:

http://www.microsoft.com/windowsxp/expertzone/newsgroups.mspx

For Windows 7 Media questions: (more W7 forums if you go up a level)

http://social.technet.microsoft.com/Forums/en-US/w7itpromedia/threads

Windows Media SDK questions belong here (see the left pane of the page
below for other WM categories including Player, Encoder and
MovieMaker):
 http://www.microsoft.com/windows/windowsmedia/community/newsgroups/WindowsMedia/default.mspx?dg=microsoft.public.windowsmedia.sdk&lang=en&cr=US

General Windows multimedia questions (wave, Video for Windows, mmio,http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.win32.programmer.mmedia

The Windows Driver Kit (previously known as the DDK) has a
forum/newsgroup on MSDN here:

http://msdn.microsoft.com/newsgroups/default.aspx?dg=microsoft.public.development.device.drivers&lang=en&cr=US


For Silverlight questions, including developer ones:

http://silverlight.net/forums/

The official Microsoft forums for Windows Media Center, including for
developers, are:

http://thegreenbutton.com/forums/

For DirectX SDK questions use these Microsoft forums:

http://forums.xna.com/forums/default.aspx?GroupID=7

For Microsoft Expression products there are forums here:

http://expression.microsoft.com/en-us/cc182192.aspx

Unfortunately, my Moderator 'move thread' permissions do not extend to
those forums.   Please read the posts at the top of the forums before
posting.

This thread is locked.  Please re-post in the appropriate forum or newsgroup.

---

Please use Vote As Helpful (green up arrow at top-left of posts) and Mark As Answer where appropriate.
My dshow site is http://tmhare.mvps.org.