Webcam - peut-on avoir des résolutions différentes pour la prévisualisation et Capture du même graphe DirectShow ? -Débordement de pile

I have 2 streams, one for Preview and one for capture in my DirectShow application. Right now, we observe that the Preview is slow for 1080P video and 1280*720 video. I would like to know if we have any method to have different resolutions for the capture and preview streams. If we have any, I can use the high resolution at capture side alone and at Preview, I am OK to display low resolutions.

Thanks

You can connect the capture output to a Infinite Tee filter. Use one output of the tee filter to capture, connect the second output to a resize filter, and use that to preview.

On some hardware you can use preview output directly in a different resolution. But not all hardware supports that. for example some hardware does not scale the preview, so if you use a lower resolution, you only see the top left part of the video. And other hardware does not have a preview pin at all...

I have 2 streams, one for Preview and one for capture in my DirectShow application. Right now, we observe that the Preview is slow for 1080P video and 1280*720 video. I would like to know if we have any method to have different resolutions for the capture and preview streams. If we have any, I can use the high resolution at capture side alone and at Preview, I am OK to display low resolutions.

Thanks

You can connect the capture output to a Infinite Tee filter. Use one output of the tee filter to capture, connect the second output to a resize filter, and use that to preview.

On some hardware you can use preview output directly in a different resolution. But not all hardware supports that. for example some hardware does not scale the preview, so if you use a lower resolution, you only see the top left part of the video. And other hardware does not have a preview pin at all...

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