VisualBoyAdvance - linux: games either too fast, or robotic sound

_numlock_ · May 13th, 2006, 12:45

Hi,

I've tried VisualBoyAdvance 1.7.2 (gtk) and a self-compiled VisualBoyAdvance CVS 2006-05-13 (SDL).

At default parameters, the speed is very high (~300%) with fast sound too. This happens with both GBA and GB ROMS.

Ok, so I tried the "--throttle=100" parameter:
- runs at correct, but very irregular game speed
- sound is totally awful with this option

Even with a less demanding game (Super Mario Land 1 on GameBoy) the problem happens. I have no issues with Super Mario Land 1 in gnuboy emulator.

Is there something else I should try ? Patches and/or alternate code is welcome, as I can try to compile it :-)

By the way: platform is gentoo, 32-bit, on 2 GHz AMD Turion64.

Thanks !

Last edited by _numlock_; May 14th, 2006 at 11:23..

**Forgotten** · May 16th, 2006, 02:12

Maybe the sound syncornization is disabled? VBA synchronizes speed by watching the sound buffer. There might have been a patch on the SDL version that could have caused this, but I don't know. You could try the previous version of SDL.cpp to see if this was the problem.

_numlock_ · May 19th, 2006, 23:26

I have just tried version 1.7 (SDL build) taken from there:
https://sourceforge.net/project/show...group_id=63889

The file is named " VisualBoyAdvance-1.7-SDL-linux-glibc22.tar.gz" and the problem is the same :-(

Does the SDL Windows version work well ?

PS: By the way, my SDL library uses ALSA sound. I'm building an OSS-only SDL version, to see if it helps. I'd really love to make it work ! What else should I try ?

Last edited by _numlock_; May 19th, 2006 at 23:33..

darth sephiroth · May 19th, 2006, 23:37

check if "frame-skip" is on... when frames are skipped i think sound gets skipped as well in vba.

_numlock_ · May 20th, 2006, 00:35

With "--no-auto-frameskip" the graphics and scrolling seem smoother. But I don't think many frames are dropped: everything is always *way* too fast, including the sound...

To stay simple, I'm testing on the gameboy game "Duck Tales", which runs at normal speed (and with fine sound) with gnuboy...

PS: I just noticed, when I hold the spacebar, VisualBoyAdvance runs extremely (~20 times) fast. Is that expected ?

By default (ie: with no command-line arguments), is VisualBoyAdvance supposed to run at max speed, or rather at normal (100%) speed ?

Last edited by _numlock_; May 20th, 2006 at 00:43..

May 13th, 2006, 12:45	#1
_numlock_ Registered User Join Date: May 2006 Location: Switzerland Posts: 3	VisualBoyAdvance - linux: games either too fast, or robotic sound Hi, I've tried VisualBoyAdvance 1.7.2 (gtk) and a self-compiled VisualBoyAdvance CVS 2006-05-13 (SDL). At default parameters, the speed is very high (~300%) with fast sound too. This happens with both GBA and GB ROMS. Ok, so I tried the "--throttle=100" parameter: - runs at correct, but very irregular game speed - sound is totally awful with this option Even with a less demanding game (Super Mario Land 1 on GameBoy) the problem happens. I have no issues with Super Mario Land 1 in gnuboy emulator. Is there something else I should try ? Patches and/or alternate code is welcome, as I can try to compile it :-) By the way: platform is gentoo, 32-bit, on 2 GHz AMD Turion64. Thanks ! Last edited by _numlock_; May 14th, 2006 at 11:23..

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May 16th, 2006, 02:12	#2
Forgotten Emu author Join Date: Oct 2001 Posts: 483	Maybe the sound syncornization is disabled? VBA synchronizes speed by watching the sound buffer. There might have been a patch on the SDL version that could have caused this, but I don't know. You could try the previous version of SDL.cpp to see if this was the problem.

May 19th, 2006, 23:26	#3
_numlock_ Registered User Join Date: May 2006 Location: Switzerland Posts: 3	I have just tried version 1.7 (SDL build) taken from there: https://sourceforge.net/project/show...group_id=63889 The file is named " VisualBoyAdvance-1.7-SDL-linux-glibc22.tar.gz" and the problem is the same :-( Does the SDL Windows version work well ? PS: By the way, my SDL library uses ALSA sound. I'm building an OSS-only SDL version, to see if it helps. I'd really love to make it work ! What else should I try ? Last edited by _numlock_; May 19th, 2006 at 23:33..

May 19th, 2006, 23:37	#4
darth sephiroth .!. (^.^) .!. Join Date: Jan 2006 Location: You're looking at it right now. Posts: 2,017	check if "frame-skip" is on... when frames are skipped i think sound gets skipped as well in vba.

May 20th, 2006, 00:35	#5
_numlock_ Registered User Join Date: May 2006 Location: Switzerland Posts: 3	With "--no-auto-frameskip" the graphics and scrolling seem smoother. But I don't think many frames are dropped: everything is always way too fast, including the sound... To stay simple, I'm testing on the gameboy game "Duck Tales", which runs at normal speed (and with fine sound) with gnuboy... PS: I just noticed, when I hold the spacebar, VisualBoyAdvance runs extremely (~20 times) fast. Is that expected ? By default (ie: with no command-line arguments), is VisualBoyAdvance supposed to run at max speed, or rather at normal (100%) speed ? Last edited by _numlock_; May 20th, 2006 at 00:43..