Open Video Joiner is a practical video editor that will allow you to overlap and unify several videos of different formats in a single AVI video. The formats that allow joining together are: MPEG, VCD, AVI, ASF and WMV.
Once Open Video Joiner has created the resulting video in AVI (from overlapping all others), you can apply to that video striking transition effects.
It does not matter that each of the videos has a different frame rate, size or coding, because, by unifying them, Open Video Joiner adapts them to a single format with the codecs (both audio and video) you need.
You can free download Open Video Joiner 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.