Re: Audio Capture - File Sizes Double

Subject: Re: Audio Capture - File Sizes Double
From: Ryan Henderson <email@hidden>
Date: Fri, 20 Dec 2002 12:03:45 +0800
User-agent: Microsoft-Entourage/10.0.0.1309

On 20/12/02 10:55 AM, "Ryan Henderson" <email@hidden> wrote:

> 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.
>

Just done some more testing with the standard SondRecord program supplied by
apple.

When the settings dialog comes up and I select mono that's when all the
problems start occurring. I think it is doing what you are mentioning but
it's like QT is the problem rather than me. It's almost like it's allocating
enough space for stereo even though it's only recording in mono. Stereo
recording is fine..

>
> 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
>>>>> _______________________________________________
>>>>> quicktime-java mailing list | email@hidden
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>>>>>
>>>>
>>>
>>> Ryan Henderson
>>> Programmer
>>> 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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>
> Ryan Henderson
> Programmer
> 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)
> _______________________________________________
> quicktime-java mailing list | email@hidden
> Help/Unsubscribe/Archives:
> http://www.lists.apple.com/mailman/listinfo/quicktime-java
> Do not post admin requests to the list. They will be ignored.

Ryan Henderson
Programmer
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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	>Re: Audio Capture - File Sizes Double (From: Ryan Henderson <email@hidden>)

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