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ARSCLIST  June 2005

ARSCLIST June 2005

Subject:

Re: 2GB limit for audio file formats

From:

Rod Stephens <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Fri, 24 Jun 2005 10:03:55 -0700

Content-Type:

text/plain

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text/plain (82 lines)

Hi Alec,

I just got this off of the "Hydrogenaudio Forum Discussion" :

http://www.hydrogenaudio.org/forums/lofiversion/index.php/t32422.html

Quote:

> cliveb
> Mar 17 2005, 03:35 AM
> QUOTE(ChiGung @ Mar 17 2005, 03:40 AM)
> The common wav header can only allocate 4 bytes to state the total wav
> length in bytes which will be why there's a two Gig limit.
>
> <http://www.hydrogenaudio.org/forums/lofiversion/index.php/index.php?act=findpost&pid=282850>
>
>
> This isn't quite correct. It is true that the file length in the WAV
> header is a 4 byte integer, but it's an *unsigned* number, which means
> that the maximum size of a WAV file is actually 4GB, not 2GB.
>
> Some audio programs get this wrong, and interpret the file length as a
> signed number, thus imposing a 2GB limit. I can confirm that Wave
> Repair supports WAV files up to 4GB, and if used just for recording
> it's free. And I see someone else has pointed out that Audacity (also
> free) will also go above 2GB.


Hope this helps.

Rod Stephens
Family Theater Productions


Alec McLane wrote:

> We are recording (mostly) analog tapes to disk at a sampling rate of
> 88.2KHz and 24-bit resolution, using Peak 4.0 on a G5 running OS 10.3.5.
> While the files are for archival purposes, to make listening copies of
> these recordings we bump them down to 44.1KHz to burn to CD. For the
> archival files, however, we are encountering the 2GB limit for 32-bit
> audio
> file formats, which at that resolution only allows around 65-70 min. of
> music. I'm told this is a limit built into the standards for most audio
> files - WAV, AIFF, Sound Designer, etc., established by Microsoft, Apple,
> and Digidesign, respectively.
>
> While this is enough to record, say, one side of a cassette tape, it may
> not be enough for a 10" reel at 3 3/4 ips, nor is it enough for those few
> occasions when we record from 95- or 125-min DATs. The virtue of Peak 4.0
> is that it allows burning a "playlist" to CD from regions defined
> within a
> single file, and doesn't require the saving of smaller files in order to
> make a CD from the recording. But it has the disadvantage of just
> stopping
> the recording at the 2GB limit, without at least opening up a new file to
> continue, so many recordings get truncated and we have to figure out
> where
> it stopped and begin a new file manually.
>
> In addition to the recording problem, the idea of storing a complete
> tape,
> or at least a side of a tape, as a single file in archival-quality format
> on a server is appealing, just for its simplicity. So even recording
> separate files and then merging them within Peak just to burn a CD is
> still
> not an ideal solution, although for the time being it seems the only one.
>
> Has anyone else found solutions to this problem with other software?
>
> Alec McLane
>
>
> ------------------------------------------------------------------------
> Alec McLane
> Scores & Recordings/
>  World Music Archives       Phone: (860) 685-3899
> Olin Library                       Fax: (860) 685-2661
> Wesleyan University          mailto:[log in to unmask]
> Middletown, CT  06459       http://www.wesleyan.edu/libr/srhome/srdir.htm
>

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