6. Capturing with VirtualDub or VirtualVCR
6.1 Capturing with VfW or WDM drivers
"I see that there are a lot of capturing programs (like: VirtualVCR,
iuVCR, Virtualdub, VirtualdubMod, AVIO, FLYDS and more), which one should
In principle you could try all of them, but there are some catches.
There exists two device driver models: VfW (Video for Windows) and WDM
(Windows Driver Model). The capture programs VirtualVCR, iuVCR
and FLYDS support WDM, and Virtualdub, VirtualdubMod
AVIO support VfW. But a capture driver is based on one of those
device driver models. In principle you should stick to the following:
In this guide it will be shown how to capture with two capture programs: Virtualdub
(which supports VfW) and VirtualVCR (which supports WDM). Below is some
more information about VfW and WDM. If this is to technical for you, just proceed with the next subsection.
If your capture driver supports VfW, use a VfW capture program like: Virtualdub,
VirtualdubMod or AVIO.
If your capture driver supports WDM, use a WDM capture program like: VirtualVCR
Some general information about VfW and WDM:
Some bt8x8 driver information:
VfW is old (and not being developed any more) and because of its limitations,
Microsoft has come up with a new device driver model: WDM (supported natively
starting from Windows 2000).
Most video capture drivers are now being developed using WDM.
There is a VfWWDM wrapper which enables you to capture in Virtualdub (or
other VfW based capture programs) using WDM drivers. But you need a fast
processor when using this wrapper, since it produces a high CPU load.
VfW will continue to be supported in Windows 98, Windows 2000, Windows
NT and Windows XP, but most of the times the card driver is the problem.
Newer cards simply don't have VfW drivers, and only Hauppauge has VfW drivers
for W2K and XP.
VfW has no TvTuner support, while WDM has.
If you installed DirectX 9.0b (and have PAL and W2K/XP), make sure you also
install the patch! The problem is that your TV input stops
working, have a look at this thread.
You can face different kind of problems: can't capture with WDM based capture
programs keeping video and audio sync., can't capture at full size using the VfWWDM wrapper, etc. If you have similar problems, don't hesitate
to ask for help in the Capturing
video forum at doom9!
Some Hauppauge driver information:
WDM drivers for bt8x8 chips: btwincap
(you could have some troubles with installation and usage, sound appears
to be mono; btwincap is fully compatible with the wrapper, so you can use
btwincap-VirtualDub combo) or iulab
tweaked wdm driver (cannot be used with VirtualDub, because it's not
compatible with the wrapper).
WDM and VfW drivers
which are supposed to work under Windows 98, Windows 2000, Windows NT and
Windows XP (but they don't let you capture at full size though).
Video Capture Overview: General VfW and WDM information, states also
the advantages of WDM.
using Video for Windows: The timeline of VfW and WDM.
Video Capture: More
general info about VfW and WDM.
wrapper: The download link can be found in question 14.
9.0b patch: Non-NTSC TV Tuner Hotfix for DirectX 9.0b
An interesting Doom9 thread about the
history of vfw and wdm.
Next: Capturing with VirtualDub
or with VirtualVCR
Back to the Index: HOME
Last edited on: 06/13/2004 | First release: n/a
| Author: Version4Team | Content by Doom9.org