PROBLEM:
I noticed other's have an issue sometimes with their FRAPS footage showing black or blank screens for a second or two as if the frames were dropped in their videos. I encountered this problem myself and found a solution. The blank screens were not only in the rendered video, when the problem occurred they were also in my Sony Vegas Video Preview window before rendering -- YET playing back the source avi movies (the raw FRAPS footage using Media Player Classic Home Cinema (using the k-lite codec pack and x264vfw codec) there was NO blank screens in the raw footage -- only in the video preview and rendered video.
SOLUTION:
Delete Sony Vegas's SFK files which are found were the original source files are located (C:\FRAPS\Movies) and re-render if needed. Might be a good idea if you run in to the problem frequently to do the long solution below.
LONG SOLUTION:
Import all of you source FRAPS footage movies by dragging them into Vegas, save your project, then DELETE the created SFK files. Apparently, importing everything at once, Vegas has trouble sometimes randomly and the SFK files become corrupt. They will be recreated after you delete them, then close and reopen the project. I have no idea why this happens but the solution is pretty easy and the re-rendered footage rendered fine.
TL;DR:
Blank screens in FRAPS not a FRAPS issue, was a Sony Vegas issue, fix is to delete the SFK files and reopen project. Restarting Vegas may also work if deleting the SFK files does not.
