Because Sony Vegas support WMV, MPG (MPEG-1, MPEG-2, MPEG-4), MP4, MOV, ASF, SWF, FLV, etc. It doesn't support .avi format. So I want to know your video files format.
If ur video file format is .avi format or other video format that Sony Vegas doesn't support. We need convert AVI files into WMV, MPG, MP4, MOV supported by Sony Vegas. AVI to Sony Vegas is a good solution to import AVI to Sony Vegas for editing.
Video Converter Platinum is the most advanced AVI to Sony Vegas Converter software which can convert HD videos (inc.HD TS, HD MPG, HD MPEG, HD MP4, HD AVI), TOD, MOD, MTS, AVI (DivX, Xvid, etc.), QuickTime Video, 3GP, VOB, etc to Sony Vegas.