add music or subtitle track to a video file) Lossless stream editing: Combine arbitrary tracks from multiple files (ex.Lossless merge/concatenation of arbitrary files (with identical codecs parameters, e.g.Losslessly rearrange the order of video/audio segments.Losslessly cut out parts of video/audio (for cutting away commercials etc.).Lossless cutting of most video and audio formats.

Everything is extremely fast because it does an almost direct data copy, fueled by the awesome FFmpeg which does all the grunt work.

Or you can add a music or subtitle track to your video without needing to encode. It lets you quickly extract the good parts from your videos and discard many gigabytes of data without doing a slow re-encode and thereby losing quality. The main feature is lossless trimming and cutting of video and audio files, which is great for saving space by rough-cutting your large video files taken from a video camera, GoPro, drone, etc. LosslessCut aims to be the ultimate cross platform FFmpeg GUI for extremely fast and lossless operations on video, audio, subtitle and other related media files.

Free for ios download LosslessCut 3.56