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FFDShow works only for decoding and play back, it cannot be used to encode and regular VirtualDub cannot work with WMV, it works with AVI’s only.

If you want to encode some video to Microsoft MPEG-4 (WMV), you can use their Encoder. It’s free:

http://www.microsoft.com/downloads/details.aspx?FamilyID=5691ba02-e496-465a-bba9-b2f1182cdf24&DisplayLang=en

Microsoft’s Movie Maker can probably do it as well.

ok thanks, i have downloaded the ffdshow from that link, how do i compress the video using virtualdub? i don’t see the video codec listed in the compression options

FFDShow or the latest Windows Media Video 9 codecs:

FFDShow-alpha (recommended because it can’t possibly permanently mess up anything):

http://sourceforge.net/project/showfiles.php?group_id=53761&package_id=59355

It must also be configured to playback WMV1/7 and WMV2/8 (XP) - Start>All Programs>ffdshow>Configuration>Codecs and choose from the dropdown list (libavcodec = ON disabled = OFF)

Media Video 9 codecs (not needed it FFDShow works):
http://www.microsoft.com/windows/windowsmedia/format/codecdownload.aspx
http://download.microsoft.com/download/7/2/e/72e9d6eb-3412-414b-b93f-85d851e01cfb/WM9Codecs.exe

For the WMV9 codecs to work, you just need to install it (double-click the pack/.exe and follow instructions etc).

i am looking for the Microsoft MPEG-4 Video Decompressor i didnt see it, where can i get this and where can i get a guide on using it?