The disclosure details methods and systems for watermark encoding and decoding. More particularly, the step of performing motion vector prediction of each of the sub-coding units further includes: obtaining a plurality of motion vectors for multihypothesis motion compensation of a specific sub-coding unit of the sub-coding units from a plurality of other sub-codingcoding units. The system also includes an earpiece, where the earpiece includes a hollow cavity. The PGA system may additionally include control circuitry configured to change the transconductance of one or more of the front end transconductors such that the gain configurations of the PGA are independent of variations such as those due to temperature and fabrication. During the fixed shutter mode operation, an image capturing device of the video magnifier has an exposure time that is one half of a period of a cycle of the ac power line.