Max Keyframe Interval

Fundamentally, video compression is achieved by not including every frame from the original video. Only a few key frames are included in the compressed video. The DivX player creates the frames in between by incrementally applying the necessary differences. Dr. DivX tries to figure out the best place for keyframes and will try to go as long as possible without using keyframes. This gives the highest compression but it's also a lot of work for the DivX player. The Max Keyframe Interval allows you to limit how long Dr. DivX will go without a keyframe.

If you are experimenting with low-bitrate encoding, you may want to increase the Max Keyframe Interval to improve the over-all quality assuming your player can handle it.