streaming while recording using DirectShow

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tuvman - 09 Sep 2008 22:26 GMT

Hello, I have a directshow application which captures video from a
camera or TV tuner. It currently writes WMV using the ASFWriter
filter. I'm considering purchasing windows media server so I can
stream content as I'm recording to a web browser/silverlight.

Is it possible to configure windows media server to look at a
directory and stream any WMV files within it even if my application is
currently writing to it? Or is the only way to publish live content
using windows media encoder? Or is there another way?

thanks,
Tuviah

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Jerislav - 12 Sep 2008 17:03 GMT

> Hello, I have a directshow application which captures video from a
> camera or TV tuner. It currently writes WMV using the ASFWriter
[quoted text clipped - 8 lines]
> thanks,
> Tuviah

Hi,

you can instruct WMS to look into directory for WMV files, but it
won't be able to seek archive in progress. And also, it won't sync
with stream. It will just start from start of file.

So, for example, you are archiving for 15 minutes, WMS connects to
your archive, and starts broadcasting it, it will be late by 15
minutes. There isn't a way to catch up for him, unless it started
immediately after file is created.

Even in that scenario, it won't actually go smooth, because WMS isn't
made for that use case. It is easier to add program network output to
ASF Writter then to solve all this other problems.

You have good examples in Windows Media Format SDK about creating
Network sinks, and because WM ASF writer is build around WMF, it
exposes all necessary interfaces for you to configure network
broadcast or push to server.

Jerislav

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