: A powerful and free Windows-based graphical interface for FFMPEG. It allows you to convert video and audio files to various formats, including 5.1 surround sound options like AC3 or DTS, and is highly recommended by users for its speed.
Finding genuinely free software that correctly handles 5.1 channel mapping—without injecting watermarks or limiting you to two minutes—is tricky. Many "free" converters are demos. Here are the legitimate tools that respect the "free" in . dts 51 audio converter software free