extract from doom9:
"DivX 5.03 is out. It supports interlaced video, has a new post-processing algorithm which should improve perceived video quality during playback, has a video buffer verifier model in both one and two pass which can be used restrict the maximum peak bitrate and ensures that the encoded stream never violates the buffer of an MPEG-4 compliant decoder. Furthermore there's Nth-Pass encoding which means you can now perform more than 2 passes, the motion estimation algorithm has been optimized for higher resolution, the MP4creator has been removed for compliance issues but should be back in a later release, along with the intelligent IVTC functionality and some issues with DivX3.11 compatibility have been fixed."
homepage:
http://www.divx.com