I record gameplays from garrys mod using FRAPS at 60 fps, after i convert all the videos and start editing it. i put music and video overlays, after i do that some of the clips start lagging in the first 2 seconds or the last 2 seconds. not all of the converted clips but some of them start lagging at about like 6 fps - 15 fps. and that also effects the music too, so i am wondering how to fix this.
or if i upload it to youtube or save the project as a avi, the lag will dissapear.
ps: the clips i convert to avs video editor are AVI.