From what i read (and thats surely not 100% sure), the Vibratto II is the same as the Vibratto S but has an integrated controller for the dvd drive. The Vibratto S uses a seperate Chip.
There are different version out, it seems the 6168 has problems with higher bitrates and is not divx certified, the 6178 can use higher bitrates and is certified.
Main advantages of the Mediatek (in camparison to ess), it supports qpel and interlaced, better scaling of all kind of resolutions to fullscreen, supports higher bitrates.
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