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videocapture open 64 fails

asked 2014-10-20 13:30:59 -0500

Ropeburn gravatar image

updated 2014-10-20 13:33:13 -0500

How come the 64 bit compile of starter_video fails to open any of the webcams I have, yet the 32 bit compile has no problem seeing any of them? I'm on Windows 8 with VS 2012. Same behavior with OpenCV 2.4.5, 2.4.9 and 3.0 alpha. What gives?

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Did you change target window from x86 to 64 bit ?

FLY gravatar imageFLY ( 2014-10-20 13:41:39 -0500 )edit

I'm building both 32 bit and 64 bit systems with the Cmake generated solutions, so I'm not sure I understand what you are really asking. I've even included /DHAVE_DSHOW /DHAVE_VIDEOINPUT which has no effect.

Ropeburn gravatar imageRopeburn ( 2014-10-20 15:46:44 -0500 )edit

Anybody? Ideas?

Ropeburn gravatar imageRopeburn ( 2014-10-24 15:04:09 -0500 )edit

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answered 2014-10-26 01:02:17 -0500

Have you compiled your x64 version of OpenCV with the WITH_DSHOW and (WITH_VFW and/or WITH_FFMPEG) cmake options? It might miss some of the decoders required to stream your webcam.

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Yes, those are all checked. Did not resolve the issue. Thanks though. I am assuming that someone out there is using the 64bit version that they compiled.

Ropeburn gravatar imageRopeburn ( 2014-10-28 09:55:31 -0500 )edit
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answered 2014-10-28 10:16:56 -0500

Ropeburn gravatar image

I just verified that the 'with' options are the same for the 32 and 64 bit compiles.

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Asked: 2014-10-20 13:30:59 -0500

Seen: 294 times

Last updated: Oct 28 '14