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Add lossless M4A concatenation tool

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Shell script to recombine individual story m4a files back into
per-cassette files using ffmpeg concat demuxer (stream copy, no
re-encoding). Generates chapter markers from input filenames and
preserves album art.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Michael Smith
2026-02-11 09:45:27 +01:00
parent 3ba7b31148
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@@ -38,6 +38,13 @@ This document specifies the functional requirements for an SDL2 based media play
## 5. Changelog
### 2026-02-11 — Lossless M4A concatenation tool
- **New tool**: `tools/concat_cassette.sh` — losslessly concatenates multiple m4a files into a single file using the ffmpeg concat demuxer (`-c copy`, no re-encoding). Designed to recombine individual story files back into per-cassette files.
- **Chapter markers**: Generates ffmpeg metadata with one chapter per input file, titled from the input filename (sans extension). Chapters enable navigation within the combined file.
- **Album art preserved**: Attached pictures from the first input file carry through automatically via stream copy.
- **Fast-start output**: Uses `-movflags +faststart` to place the moov atom at the front for better seeking.
### 2026-02-10 — Volume control and d-pad/keyboard navigation
- **Cursor-based navigation**: Replaced mouse input with a focus-highlight model. Arrow keys (Left/Right) and d-pad move a visible blue highlight between UI elements; Enter/A button activates the focused button. Designed for use on a handheld gaming device with no mouse.