Realtime Direct Show rendering

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5.00/5 (1 vote)

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Hello,

I have just started off a little bit of programming with Directshow.
What I can do quiet easily is link up IGraphBuilder to a few filters such as IMediaControl, IBaseFilter, IVMRWindowlessControl, etc and play an avi file from the local harddrive by using a pGraph->RenderFile(..) function.

This is all good, however, now I am faced with a problem where I have an array of frames in RAM, I want to do some processing on them , and I want to render them on a directshow surface.

However, I do NOT want to save it to a temporary avi file, I want to render these frames "as they come". (real-time)

I have googled and went on codeproject, most of the implementations are using the RenderFile() function, which is something I do not want to do as saving frames to a Tmp folder first will cause a lot of delays.

I would really appreciate some help from you guys, I am a bit lost here :(

Posted 20-Feb-12 8:24am

weirdProgrammer-2

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Sergey Alexandrovich Kryukov 20-Feb-12 14:42pm

Just a note: it is not called "real time".
--SA

Sergey Alexandrovich Kryukov 20-Feb-12 14:48pm

Nevertheless, the question is interesting enough; and your understanding that using temporary files is bad, so I voted 5 for the question. (And gave an advice in my answer.)
--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-02-20T08:46:00

Solution 1

Of course you should not use temporary files. This is a pretty big topic though.

I hope this cycle of three CodeProject articles can help you to understand the techniques involved:
DirectShow Filters Development Part 1: Video Rendering with Direct2D[^],
DirectShow Filters Development Part 2: Live Source Filter[^],
DirectShow Filters Development Part 3: Transform Filters[^].

Good luck,

—SA

Posted 20-Feb-12 8:46am

Sergey Alexandrovich Kryukov

v2

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Sergey Alexandrovich Kryukov 21-Feb-12 5:19am

[OP commented, the comment moved from the "solution" which needs to be removed:]

Hi SA,

thanks a lot for your guidance, I will go through the codeproject articles that you put up.
Do you reckon this is a very long project for somebody who is just starting out on DirectShow.

P.S. thanks for the correction reg. Real time

Sergey Alexandrovich Kryukov 21-Feb-12 5:21am

You are very welcome.

I hope you can accept this answer formally (green button).

Please do not post comments like this one as a "solution": it is not a solution, will be removed, no one will get e-mail notification (but if you comment on a post or another comment, all original authors of the post will be notified), so, use comments or "Improve question".

Good luck, call again.
--SA

Sergey Alexandrovich Kryukov 21-Feb-12 5:24am

About the size and difficulty of the project -- I don't know, it depends on the scope of the application. This topic is relatively complex and difficult for development. I use more of WPF which provides much smoother programming model for such things, but perhaps less flexibility -- hard to say...
--SA