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[MBS] DiscRecording Audio quality (MBS Xojo Plugin Mailinglist archive)

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Re: [MBS] MIDI Destinations and External Devices   -   Ron Benditt
  [MBS] DiscRecording Audio quality   -   Bryan Lund
   Re: [MBS] DiscRecording Audio quality   -   Bryan Lund
    [MBS] DiscRecording Audio quality   -   marko-st ihug.co.nz
     Re: [MBS] DiscRecording Audio quality   -   Bryan Lund
      Re: [MBS] DiscRecording Audio quality   -   Christian Schmitz
       Re: [MBS] DiscRecording Audio quality   -   Bryan Lund
        Re: [MBS] DiscRecording Audio quality   -   Christian Schmitz
     Re: [MBS] DiscRecording Audio quality   -   Christian Schmitz

[MBS] DiscRecording Audio quality
Date: 20.01.04 10:16 (Tue, 20 Jan 2004 01:16:13 -0800)
From: Bryan Lund
I've been playing around with the Audio burning portion of the
DiscRecording class and I've noticed that the audio tracks created with
DRCreateDRAudioTrackMBS (as in the Audio burner example project) are of
a much lower quality than the source AIFF. (The levels are somewhat
muted and there is a fairly loud static "hiss" on any track.)

Any idea why this is? Is there some extra property that needs to be
set in order to retain the quality of the original AIFF? The Audio
burner example project has this problem, so I figured I should ask
before delving too much further.

Thanks,
-Bryan

Re: [MBS] DiscRecording Audio quality
Date: 20.01.04 23:22 (Tue, 20 Jan 2004 14:22:21 -0800)
From: Bryan Lund

On Jan 20, 2004, at 1:16 AM, Bryan Lund wrote:

> I've been playing around with the Audio burning portion of the
> DiscRecording class and I've noticed that the audio tracks created
> with DRCreateDRAudioTrackMBS (as in the Audio burner example project)
> are of a much lower quality than the source AIFF. (The levels are
> somewhat muted and there is a fairly loud static "hiss" on any track.)
>
> Any idea why this is? Is there some extra property that needs to be
> set in order to retain the quality of the original AIFF? The Audio
> burner example project has this problem, so I figured I should ask
> before delving too much further.

Just to give a little more info:

I still get this low quality audio track if I convert any audio file
(mp3, etc) to AIFF using the following settings (along with
OpenAIFFExporter):

q.SetSoundFormat 16,&hAC440000,OSTypeFromStringMBS("NONE"),2

The resulting AIFF sounds great, but when burned (from the Audio
burning example) it sounds funky.

-Bryan

[MBS] DiscRecording Audio quality
Date: 23.01.04 04:30 (Fri, 23 Jan 2004 16:30:51 +1300)
From: marko-st ihug.co.nz
I am noticing the same issue that Bryan Lund is experiencing. The .aiff
file is created by non MBS code (and I have used several including my
own). The .aiff file sounds great when played in iTunes, and in
Quicktime MoviePlayer, but after burning using the DiskRecording
DRCreateDRAudioTrackMBS calls it sounds like the bitdepth has been
decreased.

Is this being addressed ?

Note: for sample code - the problem can be replicated using the
existing sample file that comes with the plugin.

Re: [MBS] DiscRecording Audio quality
Date: 24.01.04 00:48 (Fri, 23 Jan 2004 15:48:11 -0800)
From: Bryan Lund

On Jan 22, 2004, at 7:30 PM, <email address removed> wrote:

> I am noticing the same issue that Bryan Lund is experiencing. The
> .aiff file is created by non MBS code (and I have used several
> including my own). The .aiff file sounds great when played in iTunes,
> and in Quicktime MoviePlayer, but after burning using the
> DiskRecording DRCreateDRAudioTrackMBS calls it sounds like the
> bitdepth has been decreased.
>
> Is this being addressed ?
>
> Note: for sample code - the problem can be replicated using the
> existing sample file that comes with the plugin.

I've looked into this a little further, and cannot replicate the
problem on the cocoa side (using Apple's Audio Burner example).

Any ideas?

-Bryan

Re: [MBS] DiscRecording Audio quality
Date: 24.01.04 01:27 (Sat, 24 Jan 2004 01:27:53 +0100)
From: Christian Schmitz
Bryan Lund <<email address removed>> wrote:

> I've looked into this a little further, and cannot replicate the
> problem on the cocoa side (using Apple's Audio Burner example).

I'm using Apples Code, so I've to check if they fixed something.

*later*

Oh yes. The old code only uses the left channel where the new code uses
right and left. I fix that for the next prerelease.

Mfg
Christian

Re: [MBS] DiscRecording Audio quality
Date: 28.01.04 23:58 (Wed, 28 Jan 2004 14:58:22 -0800)
From: Bryan Lund

On Jan 23, 2004, at 4:27 PM, Christian Schmitz wrote:

> Bryan Lund <<email address removed>> wrote:
>
>> I've looked into this a little further, and cannot replicate the
>> problem on the cocoa side (using Apple's Audio Burner example).
>
> I'm using Apples Code, so I've to check if they fixed something.
>
> *later*
>
> Oh yes. The old code only uses the left channel where the new code uses
> right and left. I fix that for the next prerelease.

Did this fix get put into the current prerelease? (I didn't see it in
the notes so I thought I'd ask since I don't have my new registration
key yet.)

-Bryan

Re: [MBS] DiscRecording Audio quality
Date: 29.01.04 02:31 (Thu, 29 Jan 2004 02:31:08 +0100)
From: Christian Schmitz
Bryan Lund <<email address removed>> wrote:

> Did this fix get put into the current prerelease?

Yes, of course.
I just forgot to write it down.

mfg
Christian

Re: [MBS] DiscRecording Audio quality
Date: 24.01.04 01:27 (Sat, 24 Jan 2004 01:27:13 +0100)
From: Christian Schmitz
<email address removed> <<email address removed>> wrote:

> I am noticing the same issue that Bryan Lund is experiencing. The .aiff
> file is created by non MBS code (and I have used several including my
> own). The .aiff file sounds great when played in iTunes, and in
> Quicktime MoviePlayer, but after burning using the DiskRecording
> DRCreateDRAudioTrackMBS calls it sounds like the bitdepth has been
> decreased.

Well, I just made an AIFF file 44.1 kHz, 16bit, stereo using the QT
Movie exporter and it works nice.
I can't find a difference between the AIFF before burning and after
burning.

The code from Apple I use here supports 1,2,3,4 or 6 channels, 1 to
128bit rate and 44.0 or 44.1 KHz.

Mfg
Christian