- Migrate the UI from tkinter to customtkinter (themed, system appearance)
- Detect ffmpeg via shutil.which; warn and disable concat if it's missing
- Auto-fill the output name from the first selected file
- Inline output-name conflict detection against the source files, with a
live red warning and the button disabled while a conflict exists
- Escape paths in the concat list file (quotes/backslashes), write as UTF-8
- Run ffmpeg with explicit -c:v copy / -c:a copy and surface stderr on error
- Re-enable the button and clean up file_list.txt on every exit path
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
- Plain tkinter GUI: file picker, listbox of selected videos
- Move Up / Move Down buttons to reorder the sequence
- Output name entry + output directory chooser
- Optional 'delete originals after concatenation' checkbox
- Concatenates with the ffmpeg concat demuxer (-c copy) on a worker thread
- Crude fixed time estimate (5s-per-file countdown before running ffmpeg)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
