[DirectShow] How to use VMR-9 to display video as "Nearest Neighbor"?

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Dear Experts,

I am currently using directShow to write a video player in school project. I use VMR-9 in windowless mode as my renderer filter.

Every thing work fine, my video player can play videos! But when I resize (in my case is enlarging) the application (which means resize the video window), the image of the video appeared smoothly as it has been render with Bilinear Interpolation Algorithm. But all I want is just the Nearest Neighbor Algorithm (the image look bad but real).

I've heard that this can be configured in VMR-9 renderer Filter, but Google doesn't return me any result related to this. Does anyone else here know how to do it? I am really stucked now.

Thank you very much for your concern.

Posted 26-Oct-10 18:52pm

phongvm90

Updated 26-Oct-10 22:14pm

Sauro Viti

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Sauro Viti · Answer 1 · 2010-10-26T22:11:00

I had a look at the Video Mixing Renderer Filter 9 (Win dows)[^] (I used it, but I didn't change the settings you are talking about).
I think you can use the IVMRMixerControl9 Interface (Windows)[^] and especially the IVMRMixerControl9::SetMixingPrefs Method (Windows)[^]. Here[^] you find the possible settings that you can use.

phongvm90 · Answer 2 · 2010-10-27T16:08:00

Thank for your advise Mr Sauro,

But i really don't know why IVMRMixerControl9::SetMixingPrefs Method (Windows) doesn't work with me.

I set number of streams to 1.
I set rendering mode to VMR9Mode_Windowless
I copy the code from MSDN and change a litter bit to apply it in my application:

C++

    // Get the current mixing preferences.
DWORD dwPrefs;
m_p_mix_control_->GetMixingPrefs(&dwPrefs);

// Remove the current filtering flag.
dwPrefs &= ~MixerPref9_FilteringMask;

// Add the render target flag that we want.
dwPrefs |= MixerPref9_PointFiltering;

// Set the new flags.
hr= m_p_mix_control_->SetMixingPrefs(dwPrefs);

==> the result is still the same. Like nothing happened.

How can I solve this?

[DirectShow] How to use VMR-9 to display video as "Nearest Neighbor"?

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