Q: Do you know why I can't Import some .avi files into Vegas Pro or Movie Studio ?
Answer: Not all AVI Video Files are the same.
An AVI is actually a container for many possible video codecs.
An easy way to understand this, is to imagine that an .avi video file is like a book. If the book (container) is printed in English, then English is the language (video codec) you need to know and understand in order to read the book. Because English (the video codec) is a common language understood by a many people, a large amount of publishers (or software manufacturers) use it frequently in every book/product they make.
However, if the book (container) is written in an exotic language (less common video codec) that not many people speak/understand, then most people wont be able to read it. Which means you will have to translate (convert the codec) into a language you can understand before you can use it.
AVI's are one of the most generic video file extensions in use. So they could contain virtually anything.
There are a lot of exotic video codecs in use and Vegas cannot decode them all - mainly because it would cost too much to pay for the licensing involved, which would add to the cost of buying the program.
The two biggest culprits are DivX and Xvid - Vegas can't read these.
So you will have to either convert your video files into a more common video codec that Vegas can read easily, or record your original video files using a codec/format that Vegas already likes.
If you would like to learn more about how to convert videos into different formats/codecs, then please read this article here.
How to Convert Video into Different Video Codecs and Formats
Another important thing to do before you start using Vegas for the first time is to install Apple Quicktime for Windows.
Vegas Pro and Movie Studio need Quicktime so that they can read and write particular sub-sets of video codecs.
File Formats/Codecs that Vegas Pro Likes
Opens: AA3, AAF, AIF, ASF, AU, AVC, AVCHD, AVI, BMP, BWF, CDA, DIG, DLX, DPX, DV, EXR, FLAC, GIF, H.264, HDP, IVC, JPEG, M2T, M2TS, MVC, MOV, Sony MXF (XDCAM and HDCAM SR), MP3, MP4, M4A, MPEG-1 and MPEG-2 video, MPO, OGG, OMA, Panasonic MXF (DVCPRO, AVC-Intra) PCA, PNG, PSD, QT, R3D, SFA, SND, TIFF, TGA, VOX, W64, WAV, WDP, WMA, WMV
Saves: AA3, AC3, AIF, ATRAC, AVC, AVCHD, AVI, DPX, EXR, FLAC, H.264, HDP, MOV, MP3, MPEG-1 and MPEG-2 video, MP4, M2T, Sony MXF (XDCAM and HDCAM SR), MVC, OGG, PCA, W64, WAV, WMA, WMV
File Formats/Codecs that Movie Studio Platinum Likes
Opens: AAC, AA3, AIFF, AVI, BMP, CDA, FLAC, GIF, JPEG, MP3, MPEG-1, MPEG-2, MPEG-4, MVC, OGG, OMA, PCA, PNG, QuickTime®, SND, SFA, W64, WAV, WDP, WMA, WMV, XAVC S
Saves: AAC, AC3, AA3, AIFF, AVC, AVI, BMP, FLAC, JPEG, LPEC, MP3, MPEG-2, MPEG-4, MVC, OGG, PCA, PNG, TIFF, QuickTime, W64, WAV, WDP, WMA, WMV, XAVC S