51 lines
2.1 KiB
Plaintext
51 lines
2.1 KiB
Plaintext
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Why do I hear only noise from my first audio CD?
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You may have a byte swapping problem, try cdrecord -swab
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but note that is is most unlikely that you need to use the -swab
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option from cdrecord unless your input files are broken.
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It makes more sense to find out why the inout files are not OK.
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Cdrecord assumes Motorola/Network byte order (big-endian) on input
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regardless of the byte order of the CD-Recorder. If Cdrecord
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encounters a .wav file, byte order is corrected to match the byte order
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of the .wav file.
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Cdrecord by default uses Track at once. This always gives 2 seconds
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pause between two audio tracks and loweres the audio quality.
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For best audio CD quality, use cdrecord -dao (to write in Session At Once)
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ot cdrecord -raw (to write in RAW mode). Note that there are a lot of drives
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notably from Lite-ON that have defective firmware and will write defective
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CDs if you use either TAO or SAO mode. In RAW mode, cdrecord has the
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full control over the complete CD and the chance that the CD is OK
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is much higher.
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The 2 seconds pause between two audio tracks is the CD ***standard***
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The standard says:
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Each track starts with 2 seconds of silence
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followed by at least 4 seconds of audio data.
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For that reason the 2 second pause is generated by the CD-R drive in
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Track at once (TAO) mode.
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CD's that have no pause between two tracks are illegal (compared to RED BOOK).
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These illegal disks may be made with Disk At Once (DAO) only.
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In DAO mode the writing software needs to send the 2 seconds pause as
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binary zeroes and therefore is able to create illegal disks by
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sending audio data instead.
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Some drives don't accept to write illegal disks even in SAO mode.
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In this case, use the RAW mode. In RAW mode, the drive does not even
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"know" what is going on and thus cannot prevent you from writing such
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a disk.
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This audio data (the last two seconds of a track in this case)
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however are part of the next track from viewing the TOC of the disk.
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Digital Audio Extraction programs that work correctly (as intended by the
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CD standard) split the content of a CD into files by including the
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pre-gap (usually holding 2 seconds of pause) at the end of the previous
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track.
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Joerg Schilling
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