pub fn start_lossless_cut(project: Project, out_path: PathBuf) -> Arc<Progress>Expand description
Lossless cut: ffmpeg -ss in -t dur -i src -c copy -avoid_negative_ts make_zero per segment (with
-map dropping muted audio streams), then concat demuxer when there is more than one segment.
Cuts land on keyframes (not frame-accurate) — that’s the trade for being instant.