issues with the 56KHZAUDIO option of CGFX

[AmigaMance]

Hi.
 When i set the 56KHZAUDIO variable of CGFX to 0, my mp3's are being played in slow motion! I tried with the latest and older versions of SongPlayer and also with AmigaAmp, with the same results. Why does this happen? What's the case with older versions of CGFX in which this variable doesn't even exist?

 I would have set this variable permanently to 1 but as you probably know, this messes up native graphic modes and thus it doesn't allow me to play OCS/AGA games. So, this brings me to my second question: Is there a way to set 56KHZAUDIO to 1 and still have properly working native modes?

[Framiga]

have you tryed with the

KEEPAMIGAVIDEO set to 1? (i'm not on AmigaOS atm)

[AmigaMance]

Framiga wrote:
have you tryed with the

KEEPAMIGAVIDEO set to 1? (i'm not on AmigaOS atm)

 I just did but it doesn't make any difference at all.

[itix]

When i set the 56KHZAUDIO variable of CGFX to 0, my mp3's are being played in slow motion!

Of course, because maximum playback rate is lower without 56kHz audio. Try using 27kHz in your mp3 player.

Is there a way to set 56KHZAUDIO to 1 and still have properly working native modes?

Why they would not work properly? You probably wish to use DblPal modes though.

[Framiga]

i always found a bit tricky to switch from a RTG screen to an AGA one under CGX.

No problems with Picasso96 (used in the past before getting the CVPPC).

For this reason and using the Amiga for video titling, i've been forced to create a spare boot partition starting in AGA.

[AmigaMance]

@itix

When i set the 56KHZAUDIO variable of CGFX to 0, my mp3's are being played in slow motion!

Of course, because maximum playback rate is lower without 56kHz audio. Try using 27kHz in your mp3 player.

  Hmm.. Ok! I reduced the "max freq" from 44100 to 32000hz in SongPlayer and mp3's are played correctly now.
 But since most mp3's are encoded at 44100hz, does this mean that i will experience a small reduction in the quality of playback?

Is there a way to set 56KHZAUDIO to 1 and still have properly working native modes?

Why they would not work properly?

 Because, like i said, the 56KHZAUDIO option messes up native graphics modes. If i launch a multitasking OCS/AGA game and start switching between the game's and the CGFX WorkBench screen, the game's screen will most likely become corrupted.
 In fact, WHDLoad requires to set 56KHZAUDIO to 0, otherwise you will get totally distorted gfx and sound.

You probably wish to use DblPal modes though.

 No. Just simple pal modes for non-rtg games and demos.

[Karlos]

But since most mp3's are encoded at 44100hz, does this mean that i will experience a small reduction in the quality of playback?

Yes. Wether or not that reduction is perceptable given Paula's limitations is debatable.

I used to be able to play 44kHz just fine with AmigaAMP with 44kHz playback over AHI. You just had to make sure that the AHI unit was also set to 44kHz. Of course, this was using a PPC decoder too.

[AmigaMance]

But since most mp3's are encoded at 44100hz, does this mean that i will experience a small reduction in the quality of playback?

 Yes. Wether or not that reduction is perceptable given Paula's limitations is debatable.

  Ok.

I used to be able to play 44kHz just fine with AmigaAMP with 44kHz playback over AHI. You just had to make sure that the AHI unit was also set to 44kHz. Of course, this was using a PPC decoder too.

 Strange. I have also set both AHI and AmigaAMP at 44.1khz and i'm using the PPC decoder.

[itix]

Hmm.. Ok! I reduced the "max freq" from 44100 to 32000hz in SongPlayer and mp3's are played correctly now.
But since most mp3's are encoded at 44100hz, does this mean that i will experience a small reduction in the quality of playback?

You will but not much in my opinion.

Because, like i said, the 56KHZAUDIO option messes up native graphics modes. If i launch a multitasking OCS/AGA game and start switching between the game's and the CGFX WorkBench screen, the game's screen will most likely become corrupted.
In fact, WHDLoad requires to set 56KHZAUDIO to 0, otherwise you will get totally distorted gfx and sound.

I sold by Amiga 1200 long ago but I recall it was due to programs that could not switch from DblPal kind of modes to normal Pal modes.

I did play old OCS games on my Amiga and I had 56KHZAUDIO still set. I think it was possible with WHDLoad. I wish I could remember better. You could try disabling 56kHz audio before starting WHDLoad and restore it when you quit the game. Maybe there was option in WHDLoad...?

[itix]

I used to be able to play 44kHz just fine with AmigaAMP with 44kHz playback over AHI. You just had to make sure that the AHI unit was also set to 44kHz. Of course, this was using a PPC decoder too.

Yeah, but it is not possible if you are using standard Pal mode (max play rate is tied to AGA display).

[Mad-Matt]

maybe the way it was done before cgx had the option is worth a try.

dblpal driver installed and the command "addaudiomodes dblscan quiet" run somewhere.

this was noticably more compatible running whd stuff for instance when using bvision and a tv.

[Karlos]

itix wrote:

I used to be able to play 44kHz just fine with AmigaAMP with 44kHz playback over AHI. You just had to make sure that the AHI unit was also set to 44kHz. Of course, this was using a PPC decoder too.

Yeah, but it is not possible if you are using standard Pal mode (max play rate is tied to AGA display).

I wasn't using an AGA display ;-)

[itix]

I wasn't using an AGA display

Then you never get problems But if you switched to PAL screen you would notice music starts running slower (if at 44kHz) ;-)

[Karlos]

That's true. It even happened on occasion ;-)

One irritating thing is that OctaMED soundstudio doesn't seem to want to do >27kHz regardless of any such settings (well, other than direct-to-disk).