TV Tuner and Audio Delay

[dasun43]

I have recently installed a AIW Radeon 7500 on my desktop and have been happy with it so far. One reason I chose the card was so I can watch cable TV on my computer. However, I am experiencing a minor problem. Although it works flawlessly most of the time, occassionally when I am viewing a TV telecast the audio is slightly NOT in sync with the video picture. It reminds me of watching a good Chinese-made martial arts movie dubbed in English...where the actors lips don't necessarily match what's being said.

I'm not sure why this minor problems occur at times and I don't have any idea how to eliminate it. I appreciate any help to resolve this problem. Thanks!

Pent. III, 500GHz, Win98SE, 640Meg, 20G HD (10.5 currently used), IBM DVI T55D Monitor

[AllGamer]

The Problem is not your Computer

but with Win98 OS

if you upgrade to Win2k or XP

you wont get the problem

is Win98 that is too slow to do Audio Video streams

:t

[Peter M]

Problem is that the video stream has a very short distance to travel (just from one chip to the other on the AIW card), while the audio stream needs to go through AGP and the chipset northbridge into system RAM, to be picked up by the sound equipment in the south bridge or on the PCI bus.

Depending on how high the load on the chipset is, and on how good the interrupt service latencies of the operating system are, the two streams will go out of sync.

The only cure to get them EXACTLY in sync is to plug the TV card's analog audio-out into the sound card's audio-in - that way, you feed the readymade audio signal directly into the output logic, without any data travelling through the system.

[dasun43]

To AllGamer: I have never heard about that before - with re to Win98 causing this problem. But I will take that to account.

To Peter Missel: I did have the card's analog audio-out plugged into the sound card's audio-in.

I did mention that for the most part, both the video and audio streams are in sync. It seems only occassionally do they go out of sync. I just don't have a clue as to why it happens at times.

I didn't mention it previously but I am using a Yamaha DS-XG v.4.07.104 sound card. I'm not sure if a driver upgrade is offerred.

[$1500-P4 gamer]

What format are ya capturing in? In divx or mpeg2 for like video cd it compresses on the fly I think. SO it takes a much more powerfull cpu and more ram, faster HDD access and write speeds aswell. For this a 1 gig cpu and atleast 256-512mb of ram I'm guessing on ram though. And a 7200rpm ata100 hdd made all the dif. for me in capturing speed. Notta hicup. If its waiting to write to the hdd or running VM heavily it will cause latency. Also if your system is busy doing anything else with pci bus it will cause it to pause as only one device can comunicate one way at a time. Anyhow in higher compresion I can see the ocasional studder from it tripping over itself with a 500mhz cpu. What is the spec on the hdd also?:confused:

[dasun43]

Thanks $1500-P4 gamer!

"What format are ya capturing in? In divx or mpeg2 for like video cd it compresses on the fly I think. SO it takes a much more powerfull cpu and more ram, faster HDD access and write speeds aswell."

My problem was in reference only to using the TV Tuner with which is connected to cable. As I am still new to this video card, I have yet to experience any of its features other than just watching regular TV.

"What is the spec on the hdd also?"

20.5GB Maxtor Ultra66 7200

[Peter M]

hmm ... could it be then that the audio is AHEAD of the video?

[$1500-P4 gamer]

O.K. so it out of sync even when just watching not recording. Eeek thats worse than I thought.

You gots plenty of ram for this by far. The hdd is sufficient though for capture larger would def. be better. But its not gonna cause this prob. The performance jump from ata66-100 is minimal...well aslong as both are 7200rpm that is.

I would try this.
First update your ATI drivers and soundcard drivers......

Here is the ati radeon 7500 all in wonder win98 drivers and capture software. Follow their instructions to the letter on the install.
http://www.ati.com/support/drivers/win98/radeonwdm-98.html

the sound card is a yamaha ds-xg the v.4.07.104 is the driver version. Your looking for a higher # for newer driver.
Here is the drivers by yamaha lsi
http://www.yamaha.co.jp/english/product/lsi/us/support/downloads.html
from here
http://www.yamaha.co.jp/english/product/lsi/us/support.html



Then ctrl + alt + del to close all progs running except explorer and systray. Run defrag (very important)! Then check for spyware also with the free program adaware from here....
http://www.lavasoftusa.com/

Let us know where that gets ya.:t

[$1500-P4 gamer]

Originally posted by AllGamer
The Problem is not your Computer

but with Win98 OS

if you upgrade to Win2k or XP

you wont get the problem

is Win98 that is too slow to do Audio Video streams

:t

I dont know about that. I capture in dvd quality and video cd compresion on the fly (more demanding!) not one dropped frame in windows 98/ME. Havent had a sync prob yet. Maybe Im lucky dunno.:t