Re: Audio Capture - File Sizes Double

• Subject: Re: Audio Capture - File Sizes Double
• From: Steve Franks <email@hidden>
• Date: Fri, 20 Dec 2002 11:23:28 +0800

On 20/12/02 3:50 AM, "ryan francesconi" <email@hidden> wrote:

i haven't noticed this in my code and files. data of that size doesn't fit
in a resource fork. my only guess is that you are recording stereo and are
expecting mono data. or you are recording at 44.1 and are expecting 22050,
etc..
but you're no dummy so i'm sure you thought of that already. then again it
maybe a bug.

Yeah I have checked all those things. See the problem is QT reports the file
size for that track to be the correct size, when you export that single
track it is the right size, but the file system reports the file to be
double the tracks size. There is only one track in the movie. And it does
not happen on windows !

See this image:

http://ryan.bur.st/sizediff.gif

try compressing your audio with the exporter. i generally record to file
then immediate compress or export the result. that may solve your problem.
that might be why i haven't noticed. also, i haven't messed with this stuff
since last spring.

Yeah our files get compressed by our custom compressors using cleaner on
different machines. There obviously is the post recording / pre -
compression workaround, but I would prefer not to use a workaround.

rf





----- Original Message -----
From: "Ryan Henderson" <email@hidden>
To: "Steve Franks" <email@hidden>;
<email@hidden>
Sent: Wednesday, December 18, 2002 10:58 PM
Subject: Re: Audio Capture - File Sizes Double

On 19/12/02 1:43 PM, "Steve Franks" <email@hidden> wrote:

Hmmm, dont have any direct experience about this, but I just wonder if
its duplicating the
data in the resource fork since its so close to double.

I have no idea myself (No experience with JDirect either). The problem we
have is that our recordings are now 500mb instead of 250mb and we FTP each
file at least once over the network. So you can imagine that makes quite a
bit of extra network traffic. The thing is this happens using QT's

supplied

sample code. It's not like I am doing anything special..

Thanks for the idea anyway.

On Thursday, December 19, 2002, at 01:00 PM, Ryan Henderson wrote:

I have done few tests and this still seems to be a problem.

Basically audio files captured using QTJava (maybe just a QuickTime
thing
not so sure yet) are double the audio tracks size. So if you record
say 5
seconds @ 80k per second the file size should be 400k but the file
consumes
800k!


See :

http://ryan.bur.st/sizediff.gif

as an example screenshot of the output differences.


If you export the movie it is still the same size, however if you just
export the track and then save the movie it comes out at the proper
size.

Can anybody out there capturing audio please confirm this happens to
them as
well.


Cheers
Ryan
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Ryan Henderson
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Multimedia Centre
University of Western Australia

"Not everything that can be counted counts, and not everything that counts
can be counted." - Albert Einstein (1879-1955)
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University of Western Australia

"Not everything that can be counted counts, and not everything that counts
can be counted." - Albert Einstein (1879-1955)
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