#!/bin/bash # chd2iso_repack.sh INPUT_CHD="$1" OUTPUT_ISO="$INPUT_CHD%.chd_repacked.iso" TEMP_DIR=$(mktemp -d)echo "Extracting CHD..." chdman extractcd -i "$INPUT_CHD" -o "$TEMP_DIR/disc.cue" -ob "$TEMP_DIR/disc.bin"
echo "Converting to intermediate ISO..." bchunk "$TEMP_DIR/disc.bin" "$TEMP_DIR/disc.cue" "$TEMP_DIR/interim"
echo "Mounting and repacking..." sudo mount -o loop,ro "$TEMP_DIR/interim.iso" "$TEMP_DIR/mnt" mkisofs -R -J -udf -o "$OUTPUT_ISO" "$TEMP_DIR/mnt" sudo umount "$TEMP_DIR/mnt" convert chd to iso repack
echo "Cleaning up..." rm -rf "$TEMP_DIR" echo "Repacked ISO created: $OUTPUT_ISO"
Most fan-translation patches (XDelta, IPS, or PPF) are designed for ISO or BIN/CUE files. Applying a translation patch directly to a CHD is impossible without decompression.
| Issue | Likely Cause | Solution |
|-------|--------------|----------|
| chdman fails with "unsupported version" | CHD v5+ (MAME 0.200+) | Update MAME tools to latest |
| Repacked ISO won't boot | Missing boot catalog | Add -b boot/bootimage.bin to mkisofs |
| Audio tracks missing | CHD contained CD-DA | Use extractcd and keep .cue for burning |
| File sizes mismatch | Padding removal | Compare sector counts; repack is normal | Most fan-translation patches (XDelta, IPS, or PPF) are
Do not confuse repacking (modifying content) with recompressing. Converting CHD to ISO expands the data so you can modify it. After editing, you can repack it back into a CHD to save space again.