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

Tags:
  • Tuner Cards
  • TV
  • Tuner
  • Video
  • Graphics
Last response: in Graphics & Displays
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Anonymous
February 16, 2002 12:16:33 AM

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>

More about : aiw capture tuner video audio synchro

Anonymous
February 17, 2002 10:24:35 PM

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

- 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.
February 18, 2002 6:07:02 AM

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.
Anonymous
February 18, 2002 6:53:38 AM

i had already kept my hd defragged.

i think i have to buy an XP 2000+ ?
Anonymous
February 19, 2002 8:19:01 AM

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>
Anonymous
February 21, 2002 6:22:24 AM

what are you talking about ?

i have no need of TBC nor DV.
i just record my tv-tuner from my AIW on my HD.
Anonymous
February 21, 2002 8:46:18 AM

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>
February 21, 2002 1:33:27 PM

its an AIW with an integrated tv-tuner ???


if you know you don't know, the way could be more easy.
February 22, 2002 4:35:15 PM

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.
February 23, 2002 11:12:49 AM

what hd type is preferable, an SCSI or an IDE ?

i think an SCSI hd is "the best of" for capture,A/V,... due to is less cpu dependant.


if you know you don't know, the way could be more easy.
February 23, 2002 11:16:57 AM

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.
February 23, 2002 3:14:39 PM

I highly recommend that you use Windows 2000 or XP, then get 2 HD's (I recommend the Maxtor 40GB 7200RPM ATA133 drivers) then connect them to another 133 IDE controler. By doing this you can use Windows 2000 or XP to turn the 2 HDs into one using Dynamic Disk Management, this also turns the drivers into a RAID array, allowing less skipped frames and will help utilize less CPU resources.

Here are My computer Specs:
Tyan Trinity 400 Pentium 3 Motherboard
1 Ghz Pentium 133 Processor
512 MB of SD133 RAM
AIW Radeon AGP card
Soundblaster live 5.1 value
(1) Maxtor 30GB 7200 RPM HD
(2) Maxtor 40GB 7200 RPM HD
Promise ATA 133 IDE controler
Windows XP Professional

By the way, I am capturing with less than 1% frame loss at maximum settings, my CPU usage never goes beyound 65% used up. I also have any Antivisus Programs disabled as I am doing this process.

If it works for you then don't fix it.
!