I often use Microsoft's old MPEG-4 v3 in my WMV files that I have stored on my HD. I just like the quality and vbr size to them.

But now all of a sudden, both the ISO MPEG-4 v1 and MPEG-4 v3 have completely vanished from the list of available codecs. I'm using a program that can access all of the available video/audio codecs on your system for coding (i.e. Sony SoundForge).

When I attempt to run some of my other MPEG-4 v3 coded files, they run just fine. When I load VirtualDub, I can clearly see the MPEG-4 codecs v1, v2 and v3. But I'm not getting them as an option in the drop-down menus to create WMV files.

These never used to be locked before and were always available for WMV (ASF) files. So what's wrong with this? Why aren't these codecs showing up to be used and can I list or tag them somehow to show up in the list of available WMV codecs?

Thanks!

I've been in contact with someone at Microsoft and after exhausting our attempts with all sorts of codec packs, we are still unable to fix this. In Windows Media Encoder, there is no longer an option to use the "Microsoft MPEG-4 v3" codec. This is also along with "Microsoft ISO MPEG-4". These formats were the preliminary codecs however I've been using them at max VBRs with WMV (ASF) files and using WMA Pro 10.

However, recently after an installation, the codec has suddenly vanished from the drop-down list of possible codecs. Windows "does" recognize it still, and videos that are compressed with it still run. But it's no longer an option to use in encoding. This is very bizarre to me. There is really on explanation for it at all.

Can anyone help out with this?