aiw capture from tv-tuner - video/audio synchro pb

Hello Guys.

i have a problem with my ATI All in Wonder card for tv-tuner capturing.

i try to capture tv-tuner movies on mpeg2 but i have a synchronisation problem between the video and the audio

sometimes, the audio is slightly delayed & sometimes is the reverse, it's the video which is delayed.

i have modify capture setting but the best i could do is to have one hour synchro and after that degenerate.

note:
i don't know if this can help you but this is my system:

Radeon All in Wonder 32Mo DDR
TB 1.4 FSB 266
SB Live!
IBM 60GXP
Asus A7v133
512Mo PC133

this is my setting from MCM 7.1 TV-capture.
maybe this can help you too.

- Capture High Resolution Stills
- PAL, 720x576
- 22Khz, 16Bits, Stereo for audio
- MPEG2
- Deinterlacing
- Visual Masking
- 3 P frames/group
- 2 B frames/subgroup
- Variable Video Rate of 10Mbit/sec
- Quality 90%
- algorithm search ranges 32H x 32V

with this setting i have a captured video almost as the video source from the TV.

but i have yet video/sound synchronization problems.


is someone knows this problem ?

thanks for your help.
<P ID="edit"><FONT SIZE=-1><EM>Edited by Mastiff on 02/19/02 08:26 PM.</EM></FONT></P>

I have seen this problem before. It usually has to do with a fragmented HD or too little CPU available. I use a second HD specifically for capture that I keep defragged. If the #2 HD is on a different controller this will also help.

Also, early drivers exhibited this problem.

Normaly this kind of problems are deu to broken signal.
The can be fixed using a Device calld TBC or by recording your material to DV first and capturing from DV.

the most simple way will probably capture in 1 hour or less parts.


Intel / AMD - <A HREF="http://www.llnl.gov/asci/news/white_news.html" target="_new">IBM are still the best</A>

Exactly
and you get audio and Video Sync problems.
Record your material to VHS and capture from it. You still might need a TBC or dubbing to DV to get reed of the sync problems.

Intel / AMD - <A HREF="http://www.llnl.gov/asci/news/white_news.html" target="_new">IBM are still the best</A>

low cpu can generate a video/audio desynchro at capture starting.

a scsi hd is sometimes necessary for high quality capture (less cpu utilization than ide - 2-3% instead of 10-20%)


if you know you don't know, the way could be more easy.

can some bad audio drivers (maybe even some bad audio cards) involve this kind of audio desynchro issue ?


if you know you don't know, the way could be more easy.