A 4K Blu-ray remux is a direct lossless transfer of the audio, video, and subtitle streams from a 4K Ultra HD Blu-ray disc into a single file container (typically MKV) without transcoding or re-encoding. The goal is to preserve the original disc-quality streams (HEVC/HEVC HDR, object-based audio, subtitle tracks, menus optionally) so playback matches the source disc bit-for-bit for audiovisual streams.
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The remux may also include lossy secondary tracks (AC3, E-AC3) for compatibility or commentary. Blu-ray Remux 4K — Complete Guide What it