User guide

MKV
MKV is a flexible, open standard video file format that has quickly
become the preferred file extension for high definition video on
the Internet. It natively supports features like alternate audio
tracks, multilingual subtitles and chapter points, as well as rich
metadata authoring including cover art, ratings, descriptions and
more. These features made it the perfect choice for DivX Plus™
HD video, allowing us to create an ideal viewing experience.
DivX 10
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DivX, LLC User Guide
The process of tracking blocks back to matching areas in the previous
frame (known as the reference frame) is called the motion search, or
motion estimation. The frame recreated from a reference frame by
application of motion estimation is known as the compensated frame.
You can see the motion search in action using the encoder feedback
window of the DivX Codec (e.g. in third party apps like VirtualDub).
While encoding set Show picture to Compensated frame and turn
on Show Motion Vectors.
The white lines overlaid on the compensated frame represent motion
vectors returned by the motion search, tracking each block back to
a matching area in the reference frame.
Where blocks area gray in the compensated frame, the motion search
failed to find a suitable match in the reference frame. These blocks
will be encoded as image data instead of motion vectors.