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Full Version: POSTGAP / PREGAP in Cue-Sheets
Hydrogenaudio Forums > CD-R and Audio Hardware > CD Hardware/Software
Vietwoojagig
Hi,

I was making some test with POSTGAP and PREGAP in cue-sheets
I used this cue:
CODE
FILE "01.wav" WAVE
 TRACK 01 AUDIO
   INDEX 01 00:00:00
   POSTGAP 00:20:00
FILE "02.wav" WAVE
 TRACK 02 AUDIO
   PREGAP 00:10:00
   INDEX 01 00:00:00

What I was expecting was this:
Track 1: 01.wav + 20 seconds of silence
Track 2, Index 0: 10 seconds filled with silence
Track 2, Index 1: 02.wav

I made the test with EAC, Burrrn, burnatonce and Nero 7.

Burrrn and burnatonce ignored the POSTGAP:
Track 1: 01.wav
Track 2, Index 0: 10 seconds filled with silence
Track 2, Index 1: 02.wav

Nero burned everything as expected.

EAC had the strangest behaviour:
Track 1: 01.wav
Track 2: 20 seconds filled with silence
Track 3: 10 seconds filled with silence
Track 4: 02.wav

Leaving out PREGAP or POSTGAP out of the cue made EAC work (for the new cases) as expected.

Can someone confim the behaviour? I used EAC 0.95beta4 with CDRDAO
Why do burrrn and burnatonce ignore the POSTGAP command.

thanks
Never_Again
QUOTE(Vietwoojagig @ Mar 16 2006, 08:58 AM)
EAC had the strangest behaviour:
Track 1: 01.wav
Track 2: 20 seconds filled with silence
Track 3: 10 seconds filled with silence
Track 4: 02.wav
*

I don't even get that far. EAC (0.95 beta 3) apparently doesn't like your your cue sheet and, according to its CD Layout Editor, changes it to
CODE
FILE "01.wav" WAVE
 TRACK 01 AUDIO
   INDEX 01 00:00:00
FILE "02.wav" WAVE
 TRACK 02 AUDIO
   PREGAP 00:20:00
   INDEX 01 00:00:00

without notice. Editing the the cue within EAC to correct these changes does not help: when you reopen it, it's back to the way EAC set it. Writing aborts at the lead-in stage with this Error Message dialog box:
CODE
Write error!
Send CUE sheet :
Invalid field in paramater list
The CD-R remains blank.
Egor
Some information about possible porblem with PREGAP is included in CDRWIN's help file:
QUOTE
PREGAPS GREATER THAN 3 SECONDS LONG - Some recorders will refuse to record a disc with any pregaps that exceed three seconds in length.
Vietwoojagig
It's definitely a EAC Bug.

After loading the CUE into EAC, it shows the following disc-layout:
CODE
+-------+-------+-------+-------+--------+
| Title | File  | Track | Index | Length |
+-------+-------+-------+-------+--------+
|  01   |   1   |   1   |   1   |  04:45 |
|       |   -   |   2   |   0   |  00:10 |
|  01   |   -   |   1   |   1   |  00:20 |
|  02   |   2   |   2   |   1   |  05:50 |
+-------+-------+-------+-------+--------+

But It should be:
CODE
+-------+-------+-------+-------+--------+
| Title | File  | Track | Index | Length |
+-------+-------+-------+-------+--------+
|  01   |   1   |   1   |   1   |  04:45 |
|       |   -   |   -   |   1   |  00:20 |
|       |   -   |   2   |   0   |  00:10 |
|  02   |   2   |   2   |   1   |  05:50 |
+-------+-------+-------+-------+--------+

You see, line 2 and 3 have been messed up.
The layout is wrong before CDRDAO or a recorder is involved.
Egor
Yeah, I see that EAC has a bug smile.gif when PREGAP and POSTGAP are neighbouring, but my comment was actually to previous poster Never_Again, who had got "Send CUE sheet: Invalid field in paramater list" error.
Never_Again
I did some reading and more testing in the meanwhile, and here is what I found. PREGAP and POSTGAP commands are only used with WAVs that have the gaps left out. If you want gaps larger than 00:03.00, you should operate with INDEXes and WAVs created the usual way (that is, with gaps appended to previous track). As Egor's post indicates, the limit on PREGAP/POSTGAP length seems be harware imposed rather than a software bug.

Out of curiosity, I tried the same cue sheet again; this time with PREGAP/POSTGAP down to 3 sec each. The results were slightly bizarre. The NEC 3520A balked at the lead-in stage and ejected the blank. The PX-712A burned it. When I reloaded the CD-R into EAC, I was surprised to see that while the second track turned out as expected, the first track was three seconds of silence. A closer examination revealed that the entire first track appeared as hidden.

Yet, when I loaded the CD-R into a standalone, it played the first track as expected. Same with the NEC: no hidden track.

Thus I would recommend sticking with INDEX and WAVs with gaps appended to previous tracks; or better yet, a single WAV image.
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