Where can I set the Vse playback frame rate I want use VSE to make a short video. The source videos are  25fps so they run slightly slow. Where in the user preferences can you change this. I can't see it. Thanks in advance
Make the project match the frame rate of the video.

Go to the Preferences window, In the Dimensions section set the Frame Rate to correspond with that of the video.



Read also: https://blender.stackexchange.com/a/6270/1853