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Support lossless ALAC codec #50

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Merged
weak-head merged 3 commits into from
Nov 4, 2025
Merged

Support lossless ALAC codec #50

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386b86f
Include lossless option into readme
weak-head Nov 4, 2025
0a72e1f
Support 'alac' lossless codec
weak-head Nov 4, 2025
0f5a628
Reflect ALAC encoding in the output log
weak-head Nov 4, 2025
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5 changes: 4 additions & 1 deletion README.md
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Expand Up @@ -84,7 +84,10 @@ m4bify [--help] [-d | --chapters-from-dirs] [-b <bitrate> | --bitrate <bitrate>]
**Options**

- `-d`, `--chapters-from-dirs`: Treats each top-level subdirectory as a chapter.
- `-b <value>`, `--bitrate <value>`: Sets the audio encoding bitrate (e.g. "128k", default: VBR Very High).
- `-b <value>`, `--bitrate <value>`: Sets the audio encoding bitrate. Supported values:
- `<num>k` - Fixed bitrate (e.g. "32k", "128k")
- `vbr` - VBR Very High
- `alac` - [Apple Lossless Audio Codec](https://en.wikipedia.org/wiki/Apple_Lossless_Audio_Codec)
- `--help`: Displays usage instructions and exits.

**Arguments**
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10 changes: 8 additions & 2 deletions m4bify.sh
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Expand Up @@ -117,8 +117,11 @@ function print_usage {
echo -e " ${COLORS[ARGS]}-d, --chapters-from-dirs${NC} Treats each top-level subdirectory as a chapter."
echo -e " Files within each chapter directory (including nested ones)"
echo -e " are discovered recursively and processed alphabetically."
echo -e " ${COLORS[ARGS]}-b, --bitrate <value>${NC} Desired audio bitrate for the output, e.g., \"128k\" or \"96k\"."
echo -e " Defaults to VBR Very High quality (~96-192 kbps)."
echo -e " ${COLORS[ARGS]}-b, --bitrate <value>${NC} Desired audio bitrate for the output."
echo -e " Supported values:"
echo -e " - ${COLORS[ARGS]}<num>k${NC} - Fixed bitrate (e.g. 32k, 128k)"
echo -e " - ${COLORS[ARGS]}vbr${NC} - VBR Very High (~96-192 kbps)"
echo -e " - ${COLORS[ARGS]}alac${NC} - Apple Lossless Audio Codec"
echo -e " ${COLORS[ARGS]}--help${NC} Display this help message and exit."
echo -e ""
echo -e "${COLORS[TITLE]}Arguments:${NC}"
Expand Down Expand Up @@ -223,6 +226,9 @@ function convert {
quality="-q:a ${AAC_VBR_PROFILE}"
echo -e "${COLORS[ACTION]}Encoding '${path_info}' [${codec} vbr ${AAC_VBR_PROFILE}]...${NC}"
fi
elif [[ "${bitrate}" == "alac" ]]; then
codec="alac"
echo -e "${COLORS[ACTION]}Encoding '${path_info}' [alac]...${NC}"
else
quality="-b:a ${bitrate}"
echo -e "${COLORS[ACTION]}Encoding '${path_info}' [${codec} cbr ${bitrate}]...${NC}"
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