Comments

musicvid10 wrote on 2/25/2013, 2:19 PM
Download MediaInfo from SourceForge and post the complete file properties, also your system specs, OS Version, Vegas version, and Quicktime version.

Upload an original sample somewhere where it can be downloaded for examination ("somewhere" is not Youtube!)
mp4 tells us nothing.
Laurence wrote on 2/25/2013, 2:31 PM
Basically, the mp4 codec that SnagIt uses is played back through the Directshow engine in Windows 7, but as VFW in Windows XP. SnagIt video will show up on a Vegas timeline if you are running Windows XP, but only the audio will be seen by Vegas in Windows 7 (or 8 I assume).

This thread explains it:

http://www.sonycreativesoftware.com/forums/ShowMessage.asp?ForumID=4&MessageID=804352