- Add a small helper to move N_m3u8DL-RE final outputs into the expected temp path (preserve actual suffix) and keep subtitle codec consistent with the produced file.
- Skip generic HLS segment merging when N_m3u8DL-RE is in use to avoid mixing in sidecar files and reduce Windows file-lock issues.
- Harden segmented WebVTT merging to avoid IndexError when caption segment indexes exceed the provided duration list.
