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You cannot change color conversion in cv::VideoCapture without code changes.
As I know all production devices and all Android emulators since Android 2.3 support NV21 frame format. It is one of the format, that all devices must support. The is only problem with some old Android emulators, i.e. Android 2.2, that retries frames in some strange non standard format. It is emulator bug and I do not recommend you to use it.
