I would really REALLY appreciate it if someone could explain:

1.Why some codecs will work in Tmpgenc but not Virtualdub? (e.g. ffdshow)
2.Why some codecs will overwrite others and stop them from working properly? (e.g. installing OpenDivx on a system where Divx5 is installed)
3.What the difference is between directshow codecs as opposed to VFW / DirectX codecs?
4. Are codecs obtained packs better than individual codecs or do they just make things worse?

A lot of questions i know, so an answer to any of the above would be great. Thanks!

DF