multimux
Master Audio Mixdown Suite
Visually mix down multiple discrete audio container tracks into a single master track, while preserving the video stream bit-for-bit with instant, lossless, container-level passthrough. Built natively in Electron + SolidJS, powered by a high-performance concurrent D-lang core.
D-Lang Concurrency
Pipes process threads using D's native actor-model message passing, isolating FFmpeg completely to protect Electron from C-level segfaults.
Process Affinity
Updates background FFmpeg subprocess scheduling to Below Normal, keeping your operating system 100% responsive even under maximum conversion load.
Lossless Passthrough
Moves video packets bit-for-bit directly from the input container without transcoding, generating files instantly and preserving 100% original quality.