Developer Builds Python GUI Tool to Convert Stereo Audio into Dolby Digital 5.1

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A developer has released an open-source desktop application that upmixes standard two-channel stereo audio files into six-channel AC-3 Dolby Digital 5.1 surround sound. The tool, built using Python, CustomTkinter, and FFmpeg, lets users adjust surround parameters such as center mix level, rear delay, and LFE subwoofer cutoff via slider controls. It also includes one-click presets for cinema, music, and voice use cases, along with batch folder conversion and a live FFmpeg progress monitor. The application derives surround channels mathematically from stereo phase differences, routing left-minus-right signals to rear speakers to simulate spatial depth. The source code is publicly available on GitHub, and the developer documented key technical challenges including thread-safe UI updates and a Python closure variable-binding bug.

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