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Pre-emphasis detection in EAC
kikonenko
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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Posts in this topic
- kikonenko   Pre-emphasis detection in EAC   Dec 5 2013, 21:42
- - DVDdoug   QUOTE I really like EAC but missing pre-emphasis o...   Dec 5 2013, 22:13
- - pdq   Are you sure that any of your CDs actually have pr...   Dec 5 2013, 22:28
- - greynol   EAC detects pre-emphasis in TOC only. Whether man...   Dec 5 2013, 22:53
- - kikonenko   Hi, yeah it's just that i have a moderately la...   Dec 5 2013, 22:57
- - kikonenko   Sorry was typing while you posted. Thanks exactly ...   Dec 5 2013, 23:04
- - greynol   Post-0.95b3 reads from TOC only. Determining whet...   Dec 5 2013, 23:11
|- - drSeehas   QUOTE (greynol @ Dec 5 2013, 23:11) Post-...   Jul 29 2014, 19:21
- - kikonenko   Thanks, i'll make sure to post regularly with ...   Dec 6 2013, 00:16
- - edwardar   I use Cueripper, which detects pre-emphasis in the...   Dec 6 2013, 10:18
- - greynol   The link I provided makes it evident that the feat...   Dec 6 2013, 13:54
- - Porcus   Re detection software: dBpoweramp does only detect...   Dec 6 2013, 21:00
- - Lazlo Nibble   Unfortunately it's not uncommon for discs to h...   Feb 1 2014, 22:41
|- - 2Bdecided   QUOTE (Lazlo Nibble @ Feb 1 2014, 22:41) ...   Jul 31 2014, 09:03
|- - Lazlo Nibble   QUOTE (2Bdecided @ Jul 31 2014, 02:03) La...   Aug 7 2014, 01:36
- - mjb2006   I don't have 0.95 beta 3, so I can't confi...   Jul 29 2014, 22:24
|- - drSeehas   QUOTE (mjb2006 @ Jul 29 2014, 22:24) ... ...   Jul 29 2014, 22:59
- - mjb2006   Hmm, well, I'm not sure what you are trying to...   Jul 30 2014, 08:29
|- - drSeehas   QUOTE (mjb2006 @ Jul 30 2014, 09:29) ... ...   Jul 30 2014, 10:32
- - mjb2006   OK, clearly I need to research this further...   Jul 30 2014, 12:38
- - Lazlo Nibble   FWIW, I verified it by running v0.95pb3 and drSeeh...   Jul 31 2014, 00:30
|- - drSeehas   QUOTE (Lazlo Nibble @ Jul 31 2014, 01:30)...   Jul 31 2014, 07:29
- - Lazlo Nibble   Supporting information, as requested by greynol: ...   Jul 31 2014, 04:07
- - mjb2006   Thanks guys. I updated the Removed features sectio...   Jul 31 2014, 08:45
- - drSeehas   QUOTE (mjb2006 @ Jul 31 2014, 09:45) ... ...   Jul 31 2014, 08:57


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