README: update Usage & title
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README.md
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README.md
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NRGrip - extract audio track and cue sheet from an NRG audio CD image
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=====================================================================
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NRGrip - extract audio data and cue sheet from an NRG audio CD image
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====================================================================
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This program works on a Nero Burning ROM's NRG image of an audio CD and is able
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to:
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@ -35,18 +35,26 @@ on your system, then:
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Usage
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-----
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At the moment, NRGrip doesn't take any options, you just invoke it with the name
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of an NRG image:
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To see the full usage, run:
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nrgrip image.nrg
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nrgrip --help
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Basically, you can display the metadata and extract the data with:
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nrgrip -ix image.nrg
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The cue sheet will be extracted as `image.cue`, and the audio data as
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`image.raw`.
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To play the extracted raw audio data, you may use `aplay`, from the ALSA utils
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(you can also do that directly on the NRG file):
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The raw audio data from a CD is 16 bit, little endian, 44100 Hz, stereo. To
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play it, you may use, for instance, `aplay` from the ALSA utils, or `ffplay`
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from `FFmpeg`:
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aplay -f cd image.raw
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ffplay -f s16le -ac 2 image.raw
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Note that you can also play the NRG file directly, if the sector size is 2352
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(no sub-channel).
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To encode the raw audio data to FLAC (and embed the cue sheet in it):
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