Exact Audio Copy Error
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Sound Editor Tips & Tricks Information Awards Contact About me Resources Download What's new Registration Links Commercial SDK Support FAQ Forum Documentation Other Projects DAE Quality Extraction Technology In secure mode this program either reads every audio sector at least twice or rely on extended error information that some exact audio copy flac drives are able to return with the audio data. That is one reason why the exact audio copy guide program is slower than other rippers. But by using this technique non-identical sectors are detected. If an error occurs (read or sync
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error), the program keeps on reading this sector, until eight of 16 retries are identical, but at maximum one, three or five times (according to the selected error recovery quality) these 16 retries are read. So, in the
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worst case, bad sectors are read up to 82 times! But this effort will help the program to obtain the best result by comparing all of the retries. Advertisement / Anzeige If it is not sure that the audio stream is correct (at least that it can not be said at approx. 99.5%) the program will tell the user where the (possible) read error occurred. The program also tries to correct the jitter artefacts that occur exact audio copy mac on the first block of a track, so that each extraction should be exactly the same. On drives which have the "accurate stream" feature, this is guaranteed. Of course, this technology is a little bit more complex, especially with some CD drives which implements caching. When drives cache audio data, every sector read will be read from the drives cache and is that way always identical. Basically there are several ways to clear the cache. In newer versions it will overread sectors, so that the cache contains sectors from a position elsewhere on the CD. Advertisement / Anzeige EAC has several secure read modes, depending on the features of the drive. One really fast mode (nearly burst mode speed) is for drives with C2 error pointer support, accurate stream and are non-caching. Another mode (up to half of maximum speed) is for non-caching, accurate stream drives (without C2 support). If caching need to be defeated, the secure mode will be much slower, when no read errors occur it will usually something around a third to a fourth of the drives maximum speed. This program is really quite slow in secure mode in comparison with other grabbers, but the program checks every sector over and over to get the correct data with high certainty. If you don't like this feature of EAC and prefer fast copies
Active Member Thread Starter Location: Edmonton Looking for help from any Exact Audio Copy experts! I've got EAC configured to rip CD's using Secure Mode with all settings correctly specified for the model of my optical drive. Track quality is normally 100%, but
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occasionally dips to the high 90's though never below 97%. There are no noticeable artifacts in the exact audio copy psp edition tracks I've listened to, although I've observed that with many CD's there is a "Sync Error" which occurs at the end of ripping the final track; exact audio copy lame this in turn causes the error correction meter to go crazy. I'd say about half of the CD's I've ripped using Secure Mode EAC have experienced a Sync Error at the end, but never during any other part of the ripping process. http://www.exactaudiocopy.de/en/index.php/overview/basic-technology/extraction-technology/ I've listened to the rips of the final track from these discs and there doesn't seem to be any auditory glitches. Just curious if this is a problem, and if so, is there a workaround? I suspect this may have been discussed at the forums before but I can't bring anything up on search. FWIW the drive is a newer Samsung DVD-R/RW DL external USB drive that EAC reports is capable of retrieving C2 information. Any guidance is appreciated. keoki82, Apr 1, 2009 http://forums.stevehoffman.tv/threads/sync-errors-on-final-tracks-in-eac.179137/ #1 GreenDrazi Forum Resident Location: Atlanta, GA You shouldn’t have consistent errors at the end of your CD’s across a lot of discs. If so, I would suspect that this has been caused by bad handling of the discs by something like a multi-disc changer, a car CD player or some type of storage device. No easy way around it though. Clean the discs first. Try ripping on another drive to see if it handles the errors better. If you can’t hear any problems at these bad locations on normal playback, you could try ripping in burst mode. GreenDrazi, Apr 1, 2009 #2 keoki82 Active Member Thread Starter Location: Edmonton Thanks Scott, I'll give what you suggest a try. keoki82, Apr 1, 2009 #3 fadingcaptain Active Member Location: southeastern pa GreenDrazi said: ↑ If you can’t hear any problems at these bad locations on normal playback, you could try ripping in burst mode.Click to expand... Good advice. I've been ripping my entire CD/CD-R collection, and I've had this problem as well - but primarily on burned media that's more than several years old. Always the last track or so. If I have to, I'll switch to burst mode, and then listen carefully to the ripped file for sonic artifacts....sometimes there is, but often there isn't. That's much preferable to watching the drive pound away at the same track for an hour or so, and probably healthier for the drive as well. fadingcaptain, Apr 1, 2009 #4 keoki82 Active Member
EAC version: V0.99 prebeta 5 Contents 1 Extraction Method 1.1 Secure Mode 1.1.1 Drive has 'Accurate Stream' feature 1.1.2 Drive caches audio data 1.1.3 Drive is capable of retrieving C2 error information 1.2 Paranoid Mode 1.3 Fast Mode http://wiki.hydrogenaud.io/index.php?title=EAC_Drive_Options 1.4 Burst Mode 2 Drive 3 Offset / Speed 4 Gap Detection 5 Writer 6 http://www.head-fi.org/t/753005/eac-read-and-sync-errors-few-questions Notes and references 7 External links Extraction Method[edit] Secure Mode[edit] You will need to detect & apply drive features when using secure mode. Even if you chose to use the configuration wizard, it's a good idea to repeat the test a couple of times in order to be sure that the results are consistent (see link). Beware that exact audio these features are unique to every drive. Drive has 'Accurate Stream' feature[edit] Back around the turn of the century when digital audio extraction (DAE) was relatively new, some drives couldn't provide audio data from precise locations. Each time it was told to read a block of audio, a drive might produce data that was shifted slightly ahead or slightly behind. When an adjacent block of data from a subsequent read is shifted, exact audio copy it will either begin with samples repeated from the previous block, or samples between the blocks will be omitted. In DAE, this phenomenon is often called jitter or synchronization error. To compensate for this problem, EAC is able to overlap every read in order to detect and correct any misalignment. Essentially all drives produced today have a feature called 'Accurate Stream' which significantly reduces (if not completely eliminates) the chance that audio data will be shifted between successive reads. When informed that a drive has this feature, EAC will only periodically overlap its reads to check for synchronization problems. If the "Detect Read Features..." function reports "Accurate Stream: Yes", it is safe to check the "Drive has 'Accurate Stream' feature" box. This will result in a significant increase in ripping speed. Drive caches audio data[edit] In order for secure mode to work properly, every read request made by EAC must cause the drive to seek data from the CD. If your drive caches audio, subsequent requests for the same data may result in the drive only fetching this data from its buffer, rather than from the physical disc. To prevent this from happening, EAC has a routine to ensure previously requested data gets flushed from drive's cache. This is done by having the drive read ex
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