[XviD-devel] newpred

[Christoph Lampert]

On Wed, 6 Nov 2002, Michael Militzer wrote:
> > > the newpred mode is inteneded for feedback systems, where the decoder
> > > can send a message to the encoder saying "oops, the last frame i
> > > received was corrupted. dont bother resending it, just send me the next
> > > frame, but use a previous vop as the reference."
> >
> > Yes, that sounds completely reasonable... 8-}   Now we know why the
> > Stndard has so many pages...
> 
> hm, well I never read the whole standard so I never came across this
> "new_pred" description, however your description does not sound "completely
> reasonable" to me. Considering that a typical XVID video has I-frames every
> 300 frames (or even more), it seems impossible to me to let the decoder
> buffer all frames in between two i-frames. I suppose this new_pred mode was
> made for broadcasting purposes where normally a lot more i-frames are placed
> in the stream to allow quick channel switching...
> 

It's up the encoder how many frames to buffer. Only _more_ than last I-VOP
shouldn't be used. 

gruel