Two stage process
The DVD is shaky due to some poor transfer of the original film stock, and then YouTube offers to stabilise the upload, and then it adds the wobbly artefacts.
(
Varmint, Sun 22 Feb 2015, 12:31,
Reply)
I assumed it was to get around YouTube's auto-detect copyrighted content blocking?
It does have the unintentional bonus of making it look like CSI: Chigley.
(, Sun 22 Feb 2015, 14:00, Reply)