I am using avc2avi to convert the raw h264 file to avi I set the fps to 29.970 but after that's been converted i checked the fps and it's 29.969 not 29.970. Why is that? since it's not the correct fps my final video isn't sync with the audio. The original file is 29.970. How can I make avc2avi to convert with 29.970 fps?