Well, let’s clear up some assumptions first:
MPEG4, DivX, Xvid and Nero digital are essentially all the same thing, that is all of them are video compression methods based on the same algorithm, that we could call MPEG version 4 … what’s different between them is the actual software code used to obtain the result and patents applied.
- MPEG4 is patented by Microsoft, no public domain.
- Divx started as public domain, then became a commercial product.
- Xvid is a completely free poduct.
- Nero Digital is commercial but the encoders/coders will be openy released in market (see: http://www.nerodigital.com/en/index.html).
Nero Digital is innovative not for the way in which it encodes video, MPEG4-based as its brothers, but for the way it encodes sound: Full Surround can be compressed with ratios similar to MP3, greatly enhancing simple stereo recordings which are the standard with other MPEG4-based codecs such as Divx.
That said, your Panasonic manual essentially states that it can play Divx, no more: do not be confused by the “MPEG4” label.
To be able to play Nero Digital files the unit should have embedded in its firware the necessary codec, which has not yet been released (see again: http://www.nerodigital.com/en/index.html).
Hope it helps!