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<  Support  ~  Choppy Sound

Emergent
Posted: Thu Apr 03, 2008 9:23 pm Reply with quote
Joined: 03 Apr 2008 Posts: 1
Hi,

I saw your game on gamedev.net; nice work!!

I'm posting to alert you to a sound issue. Simply, the sound is choppy in the game. It's as though you're not keeping up with filling your audio buffers (or maybe they are too short). If you fire a gun, for instance, the gunshot noise continues for ~ 1 second after it should, with breaks in between. (I'm sure you've seen these classic sorts of symptoms yourself in other games.)

I didn't notice any choppiness in the sound in the menu.

The game is running rather slow on my system, but not slow enough that I'd expect the sound to not keep up. I'd estimate 15-20 fps. [There are nVidia demos (Adrianne) that run at ~2 FPS yet have smooth sound on my system!] Oddly, despite the slow speed, Task Manager tells me (while playing the game) that the CPU usage is at only 7%.

System:
Model: Lenovo Thinkpad T61
CPU: Intel Core 2 Duo T7500 @ 2.2 GHz
RAM: 2 GB
Video Card: nVidia Quadro NVS 140M
(roughly equivalent to GeForce 8400m)
Operating System: Vista Home Premium, 32-bit
Sound Card: SoundMAX Integrated HD Audio
(by Analog Devices. Driver V. 6.10.1.5410)
Real-world performance:
1 - I just did a Quake3 timedemo and got 140 fps.
2 - I'd estimate that the Bioshock demo runs at a playable-if-not-fast 25 fps on my machine.

All of this leads me to suspect that my system should be able to keep up with the sound handily. That there is choppy sound anyway makes me suspect something like too-small audio buffers, a too-low-priority audio thread, or something similar.

Sorry I'm not able to give you a ton in the way of detail, but I hope this is at least somewhat useful.

Cheers. Good luck and keep up the good work!
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coorn
Posted: Fri Apr 04, 2008 10:55 pm Reply with quote
Developer Joined: 23 Jun 2007 Posts: 23 Location: Stockholm, Sweden
Thx for the feedback, we will look in to it, hopefully fixed in Beta9

Can you test some stuff for me plz?

First turn on FPS from console: cg_drawFps 1
Turn up the snd_mixAhead until it sounds good.
Write what fps you have and how high snd_mixAhead needs to be.

Henning Tegen
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