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Setting AIFF compression?

 
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silsurf



Joined: 16 Sep 2008
Posts: 11

PostPosted: Tue Sep 16, 2008 4:32 pm    Post subject: Setting AIFF compression? Reply with quote

I have a AIFF file I exported from a DVD, it is quite large, uncompressed audio running over 4.5 gigs for 3 hours of audio.

My assumption is that I should compress this audio using one of the AIFF schemes, U-LAW, MACE, etc. in order to get it to the best size to fits on standard audio CD's?

What are the best setting for this?

Thanks in advance.

Henry
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Tue Sep 16, 2008 4:46 pm    Post subject: Setting AIFF compression? Reply with quote

If you want to save it to a standard audio CD, you can't. Audio CDs
basically require aiff files. (not quite right but close enough).

To compress without loss, you could try FLAC or Apple lossless.
Otherwise, use mp3.

Chuck

silsurf wrote:
Quote:
I have a AIFF file I exported from a DVD, it is quite large, uncompressed audio running over 4.5 gigs for 3 hours of audio.

My assumption is that I should compress this audio using one of the AIFF schemes, U-LAW, MACE, etc. in order to get it to the best size to fits on standard audio CD's?

What are the best setting for this?

Thanks in advance.

Henry




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silsurf



Joined: 16 Sep 2008
Posts: 11

PostPosted: Tue Sep 16, 2008 4:56 pm    Post subject: Hmmm? Reply with quote

I guess what I am trying to understand is that there are indeed compression schemes under the AIFF format. U-LAW, MACE and a few more.

Audio CD data runs around 800 megs for 80 mins, I have files that are AIFF, but are 2-3 times that size, clearly there is a way to get them onto a CD without burning 12 CD for a three hour concert?

Thanks for all thoughts,

Henry
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silsurf



Joined: 16 Sep 2008
Posts: 11

PostPosted: Tue Sep 16, 2008 5:21 pm    Post subject: More confusion? Reply with quote

I tried saving out a file in Amadeus using U-LAW 2:1 compression.

The file is indeed about half the size of the original. When I drop it into Toast for burning, it gets converted again and gets even smaller?

The I tried dropping some of the uncompressed files into Toast. They drop in without going through any conversion, but if I drop about 1.5 gigs of AIFF files into the Toast window, it says it can fit them all on a standard audio CD?

Hows that math work??


Henry
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Gerard Bik



Joined: 10 Nov 2006
Posts: 353

PostPosted: Tue Sep 16, 2008 5:32 pm    Post subject: Setting AIFF compression? Reply with quote

Quote:
I tried saving out a file in Amadeus using U-LAW 2:1 compression.

The file is indeed about half the size of the original. When I drop it into Toast for burning, it gets converted again and gets even smaller?

The I tried dropping some of the uncompressed files into Toast. They drop in without going through any conversion, but if I drop about 1.5 gigs of AIFF files into the Toast window, it says it can fit them all on a standard audio CD?

Hows that math work??

Henry


I would try to burn a cd and see what comes out. The low price of a blank cd will be worth it.

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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Tue Sep 16, 2008 5:52 pm    Post subject: Setting AIFF compression? Reply with quote

Not onto an audio CD -- onto a CD yes, but not onto an audio CD. An
audio CD is approximately 44.1khz stereo 16-bit words so there are a bit
over 10 megabytes per minute. End of story.

to quote wikipedia
MACE (Macintosh Audio Compression and Expansion) is an obsolete audio
encoding system. It makes a considerably smaller file than straight PCM,
but results in a huge reduction of audio quality and considerable amount
of noise at any bit rate. It has been used in, among others, AIFF file
formats.

and
u-law (mu-law) is an algorithm decreasing dynamic range.

Neither are what you want.

Chuck

silsurf wrote:
Quote:
I guess what I am trying to understand is that there are indeed compression schemes under the AIFF format. U-LAW, MACE and a few more.

Audio CD data runs around 800 megs for 80 mins, I have files that are AIFF, but are 2-3 times that size, clearly there is a way to get them onto a CD without burning 12 CD for a three hour concert?

Thanks for all thoughts,

Henry




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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Tue Sep 16, 2008 6:02 pm    Post subject: Setting AIFF compression? Reply with quote

As data or as audio? I only see time when I throw it onto an audio CD.

Also, when you added the 1.5 gbyte, had you put the CD in? You can get
a huge amount of stuff in there, but when you insert the CD, it says no
way. You could be using a DVD so it will let you add more stuff than
will fit on a CD.

Chuck

silsurf wrote:
Quote:
I tried saving out a file in Amadeus using U-LAW 2:1 compression.

The file is indeed about half the size of the original. When I drop it into Toast for burning, it gets converted again and gets even smaller?

The I tried dropping some of the uncompressed files into Toast. They drop in without going through any conversion, but if I drop about 1.5 gigs of AIFF files into the Toast window, it says it can fit them all on a standard audio CD?

Hows that math work??


Henry




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silsurf



Joined: 16 Sep 2008
Posts: 11

PostPosted: Tue Sep 16, 2008 9:29 pm    Post subject: All is good Reply with quote

AS you suggested, the proof is in the burn. The burn went fine, audio sounds great, track markers are in place. All is well.

Still confused why the individual files are so large?

I mean if I take one of these extracted AIFF files and just open it in Amadeus Pro and save it, it gets cut done in size by about 40%

Anyway, thanks very much for your help.

Henry
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robert_theory



Joined: 29 Nov 2006
Posts: 35

PostPosted: Tue Sep 16, 2008 9:53 pm    Post subject: Setting AIFF compression? Reply with quote

Quote:
Still confused why the individual files are so large?
I mean if I take one of these extracted AIFF files and just open it
in Amadeus Pro and save it, it gets cut done in size by about 40%

Two possibilities: Large metadata in the files of some sort, or you
are opening a 24-bit AIFF file and saving it as a 16-bit file.

-- Robert
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silsurf



Joined: 16 Sep 2008
Posts: 11

PostPosted: Tue Sep 16, 2008 10:18 pm    Post subject: thanks Reply with quote

Thanks again.

Henry
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Tue Sep 16, 2008 10:49 pm    Post subject: Setting AIFF compression? Reply with quote

How big are they? They should be about 10 Mbyte a minute. If you are
saving them in something other than straight aiff, you are compressing
them -- probably more correctly, throwing data out of them. When you
put them on a CD for audio, it is GOING TO BE 10 Mbytes per minute.

As far as I know, there is no socially redeeming value in saving them in
anything other than straight aiff. If you want to compress them for
storage, use mp3. At the highest accuracy level of mp3, you should
reduce the file by about a factor of 6.

Chuck

silsurf wrote:
Quote:
AS you suggested, the proof is in the burn. The burn went fine, audio sounds great, track markers are in place. All is well.

Still confused why the individual files are so large?

I mean if I take one of these extracted AIFF files and just open it in Amadeus Pro and save it, it gets cut done in size by about 40%

Anyway, thanks very much for your help.

Henry




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