AC3 avi audio, noise.

marcobdivax · 16th January 2003, 10:14

Hi.
I've recently noted a noisy audio on center/rear channels when playing avi (zoomplayer,bsplayer,powerdivx) with ac3 audio (and playing the single .ac3 from powerdvd) with very low level audio scenes: the noise is quite a "ripple" with variable frequency, and it disappears (it really disappears, it is not covered) when a dialogue/any other audio starts.
Playing the original dvd with powerdvd seems not to have such a problem (but it use cybelink filters, not ac3filters 0.63b like avi players).
I extract ac3 using smartripper or ac3tools or vstrip, no differencies.
Valex stated that this noise is a "flag" in the ac3 (header, I suppose), but if correct, how to change it?
Of course, I'm trying to understand if the problem is related to my audio card (cm8738 chipset), 'cause other friends with the same card have the same problem (unfortunately I've no other friends with different sound cards...).
Suggestions?

Thanks a lot

marco

MaTTeR · 16th January 2003, 16:32

Try the Moonlight Odio Dekoda filters noted in the AC3 FAQ to verify it's a problem with your sound card and not the filters.

Are you sure your using the latest CMedia drivers?

marcobdivax · 17th January 2003, 14:12

Thanks for the answer, I'll try the filters asap.
And, yes, the first thing I've done was to update the drivers...

ciao

marco

16th January 2003, 10:14	#1 \| Link
marcobdivax Registered User Join Date: Nov 2002 Location: Pavia, Italy Posts: 24	AC3 avi audio, noise. Hi. I've recently noted a noisy audio on center/rear channels when playing avi (zoomplayer,bsplayer,powerdivx) with ac3 audio (and playing the single .ac3 from powerdvd) with very low level audio scenes: the noise is quite a "ripple" with variable frequency, and it disappears (it really disappears, it is not covered) when a dialogue/any other audio starts. Playing the original dvd with powerdvd seems not to have such a problem (but it use cybelink filters, not ac3filters 0.63b like avi players). I extract ac3 using smartripper or ac3tools or vstrip, no differencies. Valex stated that this noise is a "flag" in the ac3 (header, I suppose), but if correct, how to change it? Of course, I'm trying to understand if the problem is related to my audio card (cm8738 chipset), 'cause other friends with the same card have the same problem (unfortunately I've no other friends with different sound cards...). Suggestions? Thanks a lot marco __________________ Proc.: AMD AthlonXp 1700+ Motherboard: DFI AD75Pro RAM: 512 Mb 333Mhz Disks: MAXTOR 60GB+IBM 40GB IDE-Ata133 Graphic card: Sparkle Geforce4 MX440 (with s-video) Audio card: Extreme 5.1 Nr. of speaker: 6 DVD: LG 16x CD-RW: Liteon 40x10x48x Monitor: Nokia 447S+LCD videoprojector O.S.: Windows 2000 Prof. SP3

16th January 2003, 16:32	#2 \| Link
MaTTeR AC3 5.1 Addict Join Date: Nov 2001 Location: Big Blue Nation_USA Posts: 2,036	Try the Moonlight Odio Dekoda filters noted in the AC3 FAQ to verify it's a problem with your sound card and not the filters. Are you sure your using the latest CMedia drivers? __________________ Need AC3 & SPDIF setup info?

17th January 2003, 14:12	#3 \| Link
marcobdivax Registered User Join Date: Nov 2002 Location: Pavia, Italy Posts: 24	AC3 noise Thanks for the answer, I'll try the filters asap. And, yes, the first thing I've done was to update the drivers... ciao marco __________________ Proc.: AMD AthlonXp 1700+ Motherboard: DFI AD75Pro RAM: 512 Mb 333Mhz Disks: MAXTOR 60GB+IBM 40GB IDE-Ata133 Graphic card: Sparkle Geforce4 MX440 (with s-video) Audio card: Extreme 5.1 Nr. of speaker: 6 DVD: LG 16x CD-RW: Liteon 40x10x48x Monitor: Nokia 447S+LCD videoprojector O.S.: Windows 2000 Prof. SP3