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Pre-emphasis detection in EAC
post Dec 5 2013, 21:42
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Hi, i'm concerned about EAC's pre-emphasis detection reliability. I've made a few rips of my cd collection and some came up pre-emphasized in EAC rightmost column. Also the generated cue sheet has FLAGS PRE. This confirms that EAC has some kind of pre-emphasis detection going. Problem is i read on some other threads that pre-emphasis info may be located in two different places (TOC and subcode) and worse, as one user suggested in a thread, they may contradict each other. As an example: a cdda2wav was posted which found pre-emphasized CD that EAC(1.03) couldn't detect (emphasis logs). A little search shows more cdda2wav log results that back up that claim. Now i'd like to keep using EAC but would hope someone here can explain where exactly EAC looks for pre-emphasis (subcode? TOC? both? why is it missing pre-emp while cdda2wav detects it? the wiki says something about a TOC detection feature that could detect pre-emphasis and copyright in the subcode was discontinued in 0.95 due to European law but that paragraph is rather confusing and i don't really get what it says). I really like EAC but missing pre-emphasis on some of my rips is a huge loss i'm not willing to take.

Thanks in advance for any help smile.gif
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Lazlo Nibble
post Feb 1 2014, 22:41
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Unfortunately it's not uncommon for discs to have the PRE flag set in the subcodes but not the TOC. My ripping workflow includes a cdrdao pass to check TOC data against the subcodes and so far I've uncovered a half-dozen or more examples in my collection, including titles mastered as late as 1989 (The Blue Nile's Hats) and pressed well into the mid-'90s (my copy of Sandra's The Long Play, which has an IFPI mould SID). If you want to know for sure, you have to check the subcodes.

I maintain a list of discs known to have pre-emphasis here, based largely on information from the Hoffman forums thread. It includes matrix code and TOC-vs.-subcode flag information where I've been able to get it.
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