# \#msvc

**URL:** https://forum.opencv.org/tag/msvc/404.md

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## [Unclear and unstable meaning of VideoCapture camera index on Windows (MSMF) when multiple cameras are present](https://forum.opencv.org/t/unclear-and-unstable-meaning-of-videocapture-camera-index-on-windows-msmf-when-multiple-cameras-are-present/24262)

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**Author:** [@Mq-b](https://forum.opencv.org/u/Mq-b)\
**Replies:** 0\
**Last updated:** [December 18, 2025, 6:31am UTC](https://forum.opencv.org/t/unclear-and-unstable-meaning-of-videocapture-camera-index-on-windows-msmf-when-multiple-cameras-are-present/24262 "2025-12-18T06:31:06Z")

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Environment OS: Windows 11 Compiler: MSVC (Visual Studio 2022) OpenCV version: (please fill in, e.g. 4.9.0) Backend: MSMF Related framework: Qt (QCameraInfo) Description I am experiencing serious ambigu…

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## [CMake Linker Error: undefined reference](https://forum.opencv.org/t/cmake-linker-error-undefined-reference/18146)

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**Author:** [@T3WI](https://forum.opencv.org/u/T3WI)\
**Replies:** 5\
**Last updated:** [July 3, 2024, 4:17am UTC](https://forum.opencv.org/t/cmake-linker-error-undefined-reference/18146 "2024-07-03T04:17:48Z")

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Hi, I am trying to get started with OpenCV with CMake, and have encountered what looks to be a linker error when building with CMake on visual studio code: \[main\] Building folder: opencv test \[build\] Starting build \[p…