Can not start playing video wherever I want in an ASF file being b

Hi all,

While the ASF video file is being built (using WriteStreamSample() or
WriteSample() functions of WMFormat v9.5 SDK), it is impossible to start
playing wherever I want in it (no matter the movie player chosen : Media
Player v10, DivX v6 Player, GraphEdit, etc).
I can only play the file by its start point.
But when file building is finished and I open it, I can start playing
wherever I want.

Is this seek restriction a limitation of WMFormat SDK or of the ASF format ?
Are there something I am doing bad ?

I noticed (via Windows Media ASFView) on a file not terminated properly
(after a voluntary "crash") that :
- file duration value is 00:00.000
- 'Broadcast' and 'Live' attributes values are '1'
- 'Data Object' size is not set and 'Data Object'does not have a packet count.
I am surprised that these fields are not updated during streaming.
Is that the problem ?

Note: I have only one stream, the video stream (no audio stream).

Thanks.
rvfr.
.

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