MPEG Pixel Encoder

[James Weatherall]

Shane,

Const's JPEG-based encoding has not been incorporated into any VNC products
- it is supported by some third-party VNC-based software that cribs it from
the TightVNC project.

VNC currently uses the ZRLE encoding for compressing updates over relatively
slow links.  When combined with colour-reduction, this tends to use less
bandwidth and CPU cycles than use of JPEG/MPEG.

Regards,

Wez @ RealVNC Ltd.
 

> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com 
> [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Shane Walton
> Sent: 05 August 2005 02:59
> To: James Weatherall; 'vnc-list'
> Subject: RE: MPEG Pixel Encoder
> 
> Thanks for your reply.
> 
> I guess that is a good reason if no loss is a requirement.
> 
> Yet, the tight/jpeg algorithm has been incorporated into
> most VNC products, and most JPEG implementations are far
> from lossless, so I guess there is a market for lossy as
> well.
> 
> The reason for entertaining this idea is that general VNC
> does not do well with large rapid changing displays. 
> 
> Thanks again for your inputs.
> 
> Regards,
> 
> Shane M. Walton
> dsrelist "at" yahoo.com
> 
> 
> --- James Weatherall <jnw "at" realvnc.com> wrote:
> 
> > The MPEG encoding scheme is "lossy", whereas VNC is not.
> > 
> > Cheers,
> > 
> > Wez @ RealVNC Ltd.
> > 
> > 
> > > -----Original Message-----
> > > From: vnc-list-admin "at" realvnc.com 
> > > [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Shane
> > Walton
> > > Sent: 04 August 2005 18:44
> > > To: vnc-list
> > > Subject: MPEG Pixel Encoder
> > > 
> > > 
> > > I have seen mention of MPEG as a pixel encoder for VNC,
> > but 
> > > have not found any implementations.
> > > 
> > > It would seem that MPEG type encoding would be more
> > > efficient than JPEG as MPEG counts for unchanged areas
> > > where JPEG doesn't maintain any history of the previous
> > > frame.
> > > 
> > > Does anybody see or know of a reason why MPEG encoding
> > > hasn't been used by VNC implementations?
> > > 
> > > Regards,
> > > 
> > > Shane M. Walton
> > > dsrelist "at" yahoo.com
> > > 
> > > 
> > > 		
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