2.1 KiB

NRGrip - extract audio data and cue sheet from an NRG audio CD image

This program works on a Nero Burning ROM's NRG image of an audio CD and is able to:

  • read and display its metadata;

  • extract the cue sheet;

  • extract the raw audio tracks as one single file, which can then be encoded by the user to a more convenient audio format such as FLAC, and possibly split according to the cue sheet.

For now, only NRG v2 is handled (not NRG v1), and not all of the metadata chunks are decoded. If you have interest in adding support for additional chunks or formats and have a test image handy, please contact the author or open a ticket. In particular, it would be interesting to support ISRC/CD-Text; handling of multisession and hybrid (audio and data) discs would also be a nice feature.

NRGrip is licensed under the terms of the Expat (MIT) license. See the COPYING file.


NRGrip is written in Rust. Make sure Cargo is installed on your system, then:

cargo build --release
cargo install


To see the full usage, run:

nrgrip --help

Basically, you can display the metadata and extract the data with:

nrgrip -ix image.nrg

The cue sheet will be extracted as image.cue, and the audio data as image.raw.

The raw audio data from a CD is 16 bit, little endian, 44100 Hz, stereo. To play it, you may use, for instance, aplay from the ALSA utils, or ffplay from FFmpeg:

aplay -f cd image.raw
ffplay -f s16le -ac 2 image.raw

Note that you can also play the NRG file directly, if the sector size is 2352 (no sub-channel).

To encode the raw audio data to FLAC (and embed the cue sheet in it):

flac --endian=little --sign=signed --channels=2 --bps=16 \
  --sample-rate=44100 --cuesheet=image.cue image.raw

To split the FLAC file according to the cue sheet, you may use, cuetools and shntool:

cuebreakpoints image.cue | shnsplit -o flac image.flac

Or mp3splt:

mp3splt -c image.cue image.flac