Copy policy
Packet-copy profiles preserve complete overlapping compressed frames where the container supports them. SmartCut64 does not claim sample-accurate splicing inside a compressed audio frame or arbitrary rewriting of opaque data streams.
Transcode policy
When a selected audio stream needs gain, channel/sample-rate change or a different codec, use an explicit transcode profile. Text subtitles can be trimmed and converted to MOV_TEXT for compatible MP4/MOV delivery; bitmap subtitle handling remains conservative.
Metadata and chapters
Container tags, chapters, dispositions, cover art and attachments are retained only when the selected output can represent them and round-trip validation succeeds. The export report records the applied policy.