Purpose -- a stripped down version of rpicam-vid that supports 2 concurrent cameras, PIP overlay and multiple output files and streams. by stripped down I mean all no other output than libav, removed post image processing, preview and all other utilities of rpicam-apps.
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libcamera development package sudo apt install -y libcamera-dev
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libav development packages sudo apt install libavcodec-dev libavdevice-dev libavformat-dev libswresample-dev
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git package sudo apt install -y git
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boost and other packages used sudo apt install -y cmake libboost-program-options-dev libdrm-dev libexif-dev
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meson build enviroment packages sudo apt install -y meson ninja-build *copy the repository https://github.com/wkeeling63/RPi2Cam.git *build program cd to the cloned repostitory
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one time meson setup meson setup build -Denable_libav=enabled *compile meson compile -C build *compile and install sudo meson install -C build
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might be need it of shared library not found sudo ldconfig