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Open camera device by index through FFmpeg #27841 ### Pull Request Readiness Checklist resolves https://github.com/opencv/opencv/issues/26812 Example of explicit backend option (similar to `-f v4l2` from command line) ``` export OPENCV_FFMPEG_CAPTURE_OPTIONS="f;v4l2" ``` see https://trac.ffmpeg.org/wiki/Capture/Webcam for available options See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake |
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