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Topic: Do I need gap detection in EAC? (Read 11189 times) previous topic - next topic
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Do I need gap detection in EAC?

Hello, I am going to start ripping my CD collection for my new (and first) portable, and I'm using EAC for the job. I was wondering if it is important to detect the gaps before ripping the tracks. I am not going to do a CD image , nor archive the WAVs in any way. Just ripping tracks to mp3. Will EAC rip the tracks correctly even if the gaps are "unknown"?

Thank you...
LAME 3.97b2 -V4 --vbr-new for iRiver H340

Do I need gap detection in EAC?

Reply #1 –
> "Will EAC rip the tracks correctly even if the gaps are "unknown"?"

Yes. EAC will detect the gaps automatically, whether you tell it to or not, and rip from/to the appropriate index positions. (actually, I just mean to say that gaps will not be left out. Appending them to the end of the previous track (the default) may or may not be "appropriate"...)

http://wiki.hydrogenaudio.org/index.php?title=Gap_settings

Do I need gap detection in EAC?

Reply #2 –
Thank you for the information. Very helpful. The default behavior seems fine for the job.
LAME 3.97b2 -V4 --vbr-new for iRiver H340

Do I need gap detection in EAC?

Reply #3 –
Quote
Yes. EAC will detect the gaps automatically, whether you tell it to or not, [a href="index.php?act=findpost&pid=336791"][{POST_SNAPBACK}][/a]


If you extract by tracks. EAC won't detect them at all. But they are appened to the previous track by default because this is the Red Book standard.
So you don't need to detect them.

Do I need gap detection in EAC?

Reply #4 –
Quote
But they are appened to the previous track by default because this is the Red Book standard.
[a href="index.php?act=findpost&pid=336801"][{POST_SNAPBACK}][/a]

Is it ? Logically and in the cuesheet the pregap belongs to the next track. The postgap of the last track doesn't exist, but the pregap of the first track can.
I know that I know nothing. But how can I then know that ?

Do I need gap detection in EAC?

Reply #5 –
Yes, all tracks begin at index 01.
Thus the gaps (indexes 00) belong to the previous track, and the gap of the first track is not read.

Do I need gap detection in EAC?

Reply #6 –
Actually, track N index 00 is played at the end of track N-1. Sorry for the confusion.

Do I need gap detection in EAC?

Reply #7 –
Well, no, in fact, the audio extraction routines in CD-ROM drives have decided to append the gaps to the previous track !

Phew !

Do I need gap detection in EAC?

Reply #8 –
I'm not sure if I understand all the languages here...If I were to use EAC to rip my CD's by tracks, then I don't need to press "F4" and do a gap detection?

Do I need gap detection in EAC?

Reply #9 –
Quote
I'm not sure if I understand all the languages here...If I were to use EAC to rip my CD's by tracks, then I don't need to press "F4" and do a gap detection?
[a href="index.php?act=findpost&pid=338133"][{POST_SNAPBACK}][/a]

You don't need to detect gaps. EAC rips from index 01 to index 01, and the index 01 possitions are listed in the CDs TOC.

-Martin.

Do I need gap detection in EAC?

Reply #10 –
Yes.
Gap detection is only sensible if you're anal (me) or want to burn the image+cue sheet back on audio CD. But then the detection is done automatically.
I know that I know nothing. But how can I then know that ?

Do I need gap detection in EAC?

Reply #11 –
Here's a new question...

I put in a CD and I detect the gaps, and EAC tells me they're all either 0s or 3.5s, but I put it in another drive and the gaps all have different values...

Should I suspect that one of these drives is not very good for DAC?

Do I need gap detection in EAC?

Reply #12 –
Quote
Yes.
Gap detection is only sensible if you're anal (me) or want to burn the image+cue sheet back on audio CD. But then the detection is done automatically.
[a href="index.php?act=findpost&pid=338154"][{POST_SNAPBACK}][/a]


But Martin H. just said you don't need to...

What if you do a gap detection? Would the rips of the tracks be any different from the tracks ripped w/o the gap detection done?

Do I need gap detection in EAC?

Reply #13 –
Quote
Here's a new question...

I put in a CD and I detect the gaps, and EAC tells me they're all either 0s or 3.5s, but I put it in another drive and the gaps all have different values...

Should I suspect that one of these drives is not very good for DAC?
[a href="index.php?act=findpost&pid=338159"][{POST_SNAPBACK}][/a]

Does it happen when Detection accuracy is set to Secure on both drives?

Do I need gap detection in EAC?

Reply #14 –
Quote
What if you do a gap detection? Would the rips of the tracks be any different from the tracks ripped w/o the gap detection done?

There will be no difference. You shouldn't detect gaps in your case... You should only detect gaps, if you wan't to change the way that the gaps are treated... EAC always detects gaps when making a cuesheet...

-Martin.

Do I need gap detection in EAC?

Reply #15 –
Quote
Here's a new question...

I put in a CD and I detect the gaps, and EAC tells me they're all either 0s or 3.5s, but I put it in another drive and the gaps all have different values...

Should I suspect that one of these drives is not very good for DAC?
[a href="index.php?act=findpost&pid=338159"][{POST_SNAPBACK}][/a]

Try a different detection method. Detection accuracy settings (Inaccurate/Accurate/Secure) are not as important as the right detection method.

Do I need gap detection in EAC?

Reply #16 –
Quote
Quote
Yes.
Gap detection is only sensible if you're anal (me) or want to burn the image+cue sheet back on audio CD. But then the detection is done automatically.
[a href="index.php?act=findpost&pid=338154"][{POST_SNAPBACK}][/a]


But Martin H. just said you don't need to...

What if you do a gap detection? Would the rips of the tracks be any different from the tracks ripped w/o the gap detection done?
[a href="index.php?act=findpost&pid=338197"][{POST_SNAPBACK}][/a]

They won't. Please distinguish between audio data and "TOC" data. Gap detection doesn't affect what EAC extracts, only the way it arranges the extracted audio data (possibly, if you tell it to append to next track or so).
I know that I know nothing. But how can I then know that ?

Do I need gap detection in EAC?

Reply #17 –
Quote
Quote
Quote
Yes.
Gap detection is only sensible if you're anal (me) or want to burn the image+cue sheet back on audio CD. But then the detection is done automatically.
[a href="index.php?act=findpost&pid=338154"][{POST_SNAPBACK}][/a]


But Martin H. just said you don't need to...

What if you do a gap detection? Would the rips of the tracks be any different from the tracks ripped w/o the gap detection done?
[a href="index.php?act=findpost&pid=338197"][{POST_SNAPBACK}][/a]

They won't. Please distinguish between audio data and "TOC" data. Gap detection doesn't affect what EAC extracts, only the way it arranges the extracted audio data (possibly, if you tell it to append to next track or so).
[a href="index.php?act=findpost&pid=338344"][{POST_SNAPBACK}][/a]


Okay, I guess this will solve it for me once and for all.

If I decide to go and make a cue sheet+image of the CD, then I should use gap detection. Right?

If I decide to go and rip the CD's for each individual tracks, then don't use gap detection? Right?

Do I need gap detection in EAC?

Reply #18 –
Quote
If I decide to go and make a cue sheet+image of the CD, then I should use gap detection. Right?

No. EAC always detects gaps when making cuesheet's, so there's no need to detect gaps manually...
Quote
If I decide to go and rip the CD's for each individual tracks, then don't use gap detection? Right?

If you want to rip to individual tracks with the gaps appended to the previous track(default), then you shouldn't detect gaps...
You only need to detect gaps if you want to change the way that the gaps are treated, like appending the gaps to the next track, or to completely leave out the gaps. If you don't detect gaps, then the options for gap treatment will be greyed out.

-Martin.

Do I need gap detection in EAC?

Reply #19 –
Quote
Quote
If I decide to go and make a cue sheet+image of the CD, then I should use gap detection. Right?

No. EAC always detects gaps when making cuesheet's, so there's no need to detect gaps manually...
Quote
If I decide to go and rip the CD's for each individual tracks, then don't use gap detection? Right?

If you want to rip to individual tracks with the gaps appended to the previous track(default), then you shouldn't detect gaps...
You only need to detect gaps if you want to change the way that the gaps are treated, like appending the gaps to the next track, or to completely leave out the gaps. If you don't detect gaps, then the options for gap treatment will be greyed out.

-Martin.
[a href="index.php?act=findpost&pid=338423"][{POST_SNAPBACK}][/a]


Okay...so this has nothing to do with whether I'll get gapless playback or not right?

Do I need gap detection in EAC?

Reply #20 –
i also have a question about gap detection:

i frequently rip single tracks from cds, and i choose to 'leave out gaps', because i figured that gaps are called gaps for a reason, and keeping them appended to a track doesn't make sense unless you're trying to keep the layout of your rip in line with that of the original cd.

is it wrong to do this? if the different gap detection methods offered by EAC produce different results, then am i running a significant risk of unintentionally leaving out parts that are not in the gap but in fact are part of the track? I'm worried because i don't know of a way to figure out which gap detection method is the 'right' one for my drive (Plextor 40/12/40A). EAC just tells me to pick the fastest one.

Do I need gap detection in EAC?

Reply #21 –
I am not sure if this is the right way but I have been using 'Detect Gaps' in EAC for all my CDs that have tracks flowing into the next (read Pink Floyd :-)). The tracks play back perfectly without any gaps after encoding so I have continued using this method. Be aware that I use mainly LAME and Ogg, which encode gapless tracks properly. I have not tried this with other encoders.

Somebody, please correct me if I am wrong   
Reason is immortal, all else mortal
- Pythagoras

Do I need gap detection in EAC?

Reply #22 –
Quote
i also have a question about gap detection:

i frequently rip single tracks from cds, and i choose to 'leave out gaps', because i figured that gaps are called gaps for a reason, and keeping them appended to a track doesn't make sense unless you're trying to keep the layout of your rip in line with that of the original cd.

is it wrong to do this? if the different gap detection methods offered by EAC produce different results, then am i running a significant risk of unintentionally leaving out parts that are not in the gap but in fact are part of the track? I'm worried because i don't know of a way to figure out which gap detection method is the 'right' one for my drive (Plextor 40/12/40A). EAC just tells me to pick the fastest one.
[a href="index.php?act=findpost&pid=338442"][{POST_SNAPBACK}][/a]

when leaving out gaps, keep in mind:
-the gap may contain audio even if EAC reports 100% silence for it
-you can't use accuraterip

Nevertheless, I often leave them out, too, since they don't belong to the tracks in my opinion, at least in case  they contain only digital silence.
I know that I know nothing. But how can I then know that ?

Do I need gap detection in EAC?

Reply #23 –
OK, to clear up the growing confusion in this thread:

Quote
Okay...so this has nothing to do with whether I'll get gapless playback or not right?
[a href="index.php?act=findpost&pid=338427"][{POST_SNAPBACK}][/a]

Gap detection has nothing to do with gapless playback.

Quote
i also have a question about gap detection:

i frequently rip single tracks from cds, and i choose to 'leave out gaps', because i figured that gaps are called gaps for a reason, and keeping them appended to a track doesn't make sense unless you're trying to keep the layout of your rip in line with that of the original cd.

is it wrong to do this? if the different gap detection methods offered by EAC produce different results, then am i running a significant risk of unintentionally leaving out parts that are not in the gap but in fact are part of the track? I'm worried because i don't know of a way to figure out which gap detection method is the 'right' one for my drive (Plextor 40/12/40A). EAC just tells me to pick the fastest one.
[a href="index.php?act=findpost&pid=338442"][{POST_SNAPBACK}][/a]

It is generally not recommended to leave out gaps. They are called "gaps" but there is often music in them. If you are unsure, just rip without detecting gaps. Then EAC will append the gaps to the previous track, that's the default behaviour, and that's how all other rippers do it. If you are worried about "wasting space" on silence, then you could use the "remove silence" option. But, I strongly recommend you don't do that. For example, if you were about to create a CD from those ripped tracks, freedb won't detect the cd properly anymore. And since you will most likely compress the ripped songs, the size difference is negligible.

Quote
I am not sure if this is the right way but I have been using 'Detect Gaps' in EAC for all my CDs that have tracks flowing into the next (read Pink Floyd :-)). The tracks play back perfectly without any gaps after encoding so I have continued using this method. Be aware that I use mainly LAME and Ogg, which encode gapless tracks properly. I have not tried this with other encoders.

Somebody, please correct me if I am wrong   
[a href="index.php?act=findpost&pid=338462"][{POST_SNAPBACK}][/a]

Again, detecting the gaps has no influence on gapless playback.

Quote
Nevertheless, I often leave them out, too, since they don't belong to the tracks in my opinion, at least in case  they contain only digital silence.
[a href="index.php?act=findpost&pid=338467"][{POST_SNAPBACK}][/a]

If they wouldn't belong there, then they wouldn't be there, would they?

Do I need gap detection in EAC?

Reply #24 –
Quote
OK, to clear up the growing confusion in this thread:

Quote
Okay...so this has nothing to do with whether I'll get gapless playback or not right?
[a href="index.php?act=findpost&pid=338427"][{POST_SNAPBACK}][/a]

Gap detection has nothing to do with gapless playback.

Quote
i also have a question about gap detection:

i frequently rip single tracks from cds, and i choose to 'leave out gaps', because i figured that gaps are called gaps for a reason, and keeping them appended to a track doesn't make sense unless you're trying to keep the layout of your rip in line with that of the original cd.

is it wrong to do this? if the different gap detection methods offered by EAC produce different results, then am i running a significant risk of unintentionally leaving out parts that are not in the gap but in fact are part of the track? I'm worried because i don't know of a way to figure out which gap detection method is the 'right' one for my drive (Plextor 40/12/40A). EAC just tells me to pick the fastest one.
[a href="index.php?act=findpost&pid=338442"][{POST_SNAPBACK}][/a]

It is generally not recommended to leave out gaps. They are called "gaps" but there is often music in them. If you are unsure, just rip without detecting gaps. Then EAC will append the gaps to the previous track, that's the default behaviour, and that's how all other rippers do it. If you are worried about "wasting space" on silence, then you could use the "remove silence" option. But, I strongly recommend you don't do that. For example, if you were about to create a CD from those ripped tracks, freedb won't detect the cd properly anymore. And since you will most likely compress the ripped songs, the size difference is negligible.

Quote
I am not sure if this is the right way but I have been using 'Detect Gaps' in EAC for all my CDs that have tracks flowing into the next (read Pink Floyd :-)). The tracks play back perfectly without any gaps after encoding so I have continued using this method. Be aware that I use mainly LAME and Ogg, which encode gapless tracks properly. I have not tried this with other encoders.

Somebody, please correct me if I am wrong   
[a href="index.php?act=findpost&pid=338462"][{POST_SNAPBACK}][/a]

Again, detecting the gaps has no influence on gapless playback.

Quote
Nevertheless, I often leave them out, too, since they don't belong to the tracks in my opinion, at least in case  they contain only digital silence.
[a href="index.php?act=findpost&pid=338467"][{POST_SNAPBACK}][/a]

If they wouldn't belong there, then they wouldn't be there, would they?
[a href="index.php?act=findpost&pid=338510"][{POST_SNAPBACK}][/a]


What's the remove silence feature that you just mentioned? Does this have to do with "fill up missing offset samples with silence"? Is the fill up missing offset samples with silence feature recommeneded or I should untick it?