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janefield2002@yahoo.com - 30 Apr 2007 04:58 GMT

Hi,

I am programmatically running Windows Media encoder to create
various .wmv files, that I then publish on a publishing point and link
to from an HTML page. However, my links are purely text based. I would
like to have thumbnails (like they have on online video websites) that
link to the videos. So, I would also like to be able to
prgrammatically extract an "image" from the .wmv that I can use as a
thumbnail / image on the HTML page that links to the video. How can I
do this?

Thanks a lot!

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vegethalia - 30 Apr 2007 07:57 GMT

Hi janefield.

You can use the WMSDK to recover the first frame of every file. Simply
do (in pseudocode:)

CComPtr<IIWMReader> pReader;
CComPtr<INSSBuffer> pINSBuff;

pReader->Open(file);
pReader->GetNextSample(videoStreamNumber, pInsBuff, times....);

Then in pInsBuff you will have the bits of the image. You can
configure the OutputProps of the reader to configure the color space
(RGB24, YUV, etc) and the size of the bitmap. Default is RGB24 and
original image size.
You also have to discover the videoStreamNumber (obtaining a profile
from the reader and examining every stream in it).

Vegethalia.

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http://www.pleyhades.com

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