[ixiehao]

An embedded cover can be exposed as a video stream, causing first-video selection to choose the image instead of the movie and producing misleading multi-video warnings. Exclude flagged cover art and timed thumbnails, carry the inspected stream index through FFmpeg conversion and merging, and match the native enhancement track by its MOV/MP4 track ID. Reject cover-only input/output and ambiguous native selection; require matching stream layouts for lossless concat.

Release v1.2.4 (build 10) includes synchronized English, Chinese and Japanese policy/README text and concise release notes.

Validation completed locally:

• 60 Swift tests: 59 passed, 1 opt-in customer-media benchmark skipped. Native Smart Enhance ran successfully with an embedded cover.
• 28 synthetic-media contract checks passed; localization validation passed.
• Cover-first probe responses and actual embedded-cover files exercise selection, editor dimensions, stream copying, software/hardware rotation and both merge routes; frame counts, changing decoded frames, duration and copied movie hashes are checked.
• Isolated universal app GUI: movie + cover succeeds without a false two-video warning; two actual movie tracks keep the real warning; audio + cover fails clearly. Retained results verified in English, Chinese and Japanese.

Packaging uses the existing ad-hoc, unnotarized workflow. Final DMG and public download verification are part of the release procedure.