Dropped frames at full res.Is it my system.

[nehpets1967]

I am using an Avermedia TVstudio card to capture TV and VHS.I have no dropped frames at 384*288,but cannot capture to full res. 768*576 despite the cards ability to do so.I would like to be able to make SVCD but at present am limited to VCD resoltions.I have been told by a local computer dealer that my TVstudio card is the problem as my system should be powerful enough:
733MHzPIII running Win98SE
256Mb PC133 ram
30Gbudma100(7200rpm)HDD
GeForce2MX
Soundblaster Live value
ASKA(Silver Star)Apollo Pro133(VIA VT82C693A&VT82C596B chipsets)DMA enabled.motherboard

I have disabled write behind caching,defrag regularly and have tried capture with bare minimum in systray.
Has anyone got any thoughts.Is this a compatibility issue.
Steve.

[holistic]

Here's the facts nehpets1967

I capture full screen .AVI on my machine (600celeron@900, 384Mb ram, ATA66 30GB drive(partitioned into 7 Gb) and W98SE [fat32]with no frame loss. BUT ... i can only capture up to 70 seconds at a time due to the 2 Gb file limit.
640*480*16*29.97 fps (ntsc) - throughput to harddrive is about 27MB/sec - no compression
You appear to be doing PAL so the formular is this 768*576*16*25 fps (HOW to figure out . - take one frame at 788*576*16 and multiply it by your frames per second. to find how much info is being transferred to your drive.)

IF you wish to capture FULL SCREEN - no compression you will need the following - A VERY fast/huge ATA66 or better harddrive with a sustained write speed of 30Mb/sec or better and windows NT/2000 with NTFS file system.

OR option (B) cheaper - use a software encoder (PICvideo MJPEG) and encode to MJPEG on the fly. A PIII 733 should meet minimal requirements. You may need to drop the compression a little.
RAM makes little difference.

good luck


*** oops for 16 read 24bit color ...duh

<font size=-1>[ This Message was edited by: holistic on 2001-08-22 08:18:28 ]</font>

[Cart Wheel]

You can't capture above 384x288, or you're dropping a lot of frames? If it's the former, try capturing with AVI_IO or VirtualDub and setting a custom frame size. You may need to reinstall the latest VFW capture drivers if that doesn't work. If it's the latter, what capture codec are you using? Try using Huffyuv or an MJPEG codec if your system isn't fast enough.

Also, make sure you're capturing in YUY2 or UYVY. And if you're making a SVCD, the highest resolution I'd suggest capturing in is 720x576 (and even that is usually overkill unless you want a perfect aspect ratio).

-Cart
http://www.geocities.com/lukesvideo/index.html