If you use a composite video connector to watch DVD,
you will see this artefact all of the time. Fortunately, it is readily
eliminated by using an S-Video, component video or RGB video connection,
unless it is inherent in the DVD's source material, which is rare. The
most common place to see this artefact on DVD is on logos which have been
sourced from composite analogue master tapes.
Postmortem - immediately after the opening RocVale logo.
This example and the one below are a loop of 18 frames (approximately 0.75 seconds).
This is a close up of the above.
Note the moving dots of red and white along the edges of the letters.