Decode information stored in a recorded video file, generated by the the "send" module. After recording a video from "send" on your phone, run this program on your personal computer to get the file back.

Vis-transfer receiver is an C++ program. To compile, you will need:

• A C++23-capable compiler (such as LLVM on Windows or a modern version of GCC on Linux);
• CMake 3.25 or higher;
• Git.

Open a terminal window in this folder (recv folder). Run the following commands to build the executable:

cmake --preset default  # Needs internet access
cmake --build build --config Release
cmake --install build --prefix dist --config Release 

The executable will be available in the dist folder. To decode a previously recorded video file, specify it as a command-line parameter, as well as the output file:

dist/vis-recv.exe recording.mp4 -o myfile.pdf

The project bundles a specific version of Vcpkg, which will be downloaded at CMake configure step. It manages the project dependencies:

• CLI11, for command-line parsing;
• OpenCV, for reading videofiles;
• ZXing, for decoding QR codes;
• LLFIO, for memory-mapped files;
• CryptoPP, for hashing;
• fmt, for logging.