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Bug#418214: xvnc4viewer: man page does not explain the enc..

  
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Kamaraju Kusumanchi

External


Since: Nov 22, 2006
Posts: 16



(Msg. 1) Posted: Sun Apr 08, 2007 1:00 am
Post subject: Bug#418214: xvnc4viewer: man page does not explain the encoding mechanisms
Archived from groups: linux>debian>bugs>dist (more info?)
Package: xvnc4viewer
Version: 4.1.1+X4.3.0-21
Severity: normal

The manual page of xvnc4viewer, obtained by doing

man xvnc4viewer

just mentions that the current vncviewer supports 3 encoding mechanisms -
"ZRLE", "hextile" or "raw". But it does not explain what those encodings
are and when to actually use them. I was very confused when I read the
manual page as to what they actually are. Even the upstream's website
( www.realvnc.com ) does not explain what they are. It would be nice to
briefly explain about these encoding mechanisms and tell the users that
"ZRLE" is good for dial up connections, "raw" is good for high speed LANs
etc.,

If necessary, you can also borrow information from tightvnc's website (
http://www.tightvnc.com/vncviewer.1.html , ENCODINGS section ).

hth
raju


-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.17-2-686
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)

Versions of packages xvnc4viewer depends on:
ii libc6 2.3.6-15 GNU C Library: Shared libraries
ii libgcc1 1:4.1.1-13 GCC support library
ii libice6 1:1.0.1-2 X11 Inter-Client Exchange library
ii libsm6 6.8.2.dfsg.1-10 X Window System Session Management
ii libstdc++6 4.1.1-13 The GNU Standard C++ Library v3
ii libx11-6 6.8.2.dfsg.1-10 X Window System protocol client li
ii libxext6 6.8.2.dfsg.1-10 X Window System miscellaneous exte
ii zlib1g 1:1.2.3-6 compression library - runtime

xvnc4viewer recommends no packages.

-- no debconf information


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Ola Lundqvist

External


Since: Nov 20, 2006
Posts: 159



(Msg. 2) Posted: Mon Apr 09, 2007 5:10 pm
Post subject: Bug#418214: xvnc4viewer: man page does not explain the encoding mechanisms [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
severity 418214 minor
thanks

Hi Kamaraju

I know that this is a problem. However I do not have a good source of
information. The tight encoding is not the same as the vnc4 codings.

If you can point me to a good location, where this is described I'll be
very happy.

Regards,

// Ola

On Sat, Apr 07, 2007 at 11:49:56PM -0400, Kamaraju Kusumanchi wrote:
> Package: xvnc4viewer
> Version: 4.1.1+X4.3.0-21
> Severity: normal
>
> The manual page of xvnc4viewer, obtained by doing
>
> man xvnc4viewer
>
> just mentions that the current vncviewer supports 3 encoding mechanisms -
> "ZRLE", "hextile" or "raw". But it does not explain what those encodings
> are and when to actually use them. I was very confused when I read the
> manual page as to what they actually are. Even the upstream's website
> ( www.realvnc.com ) does not explain what they are. It would be nice to
> briefly explain about these encoding mechanisms and tell the users that
> "ZRLE" is good for dial up connections, "raw" is good for high speed LANs
> etc.,
>
> If necessary, you can also borrow information from tightvnc's website (
> http://www.tightvnc.com/vncviewer.1.html , ENCODINGS section ).
>
> hth
> raju
>
>
> -- System Information:
> Debian Release: testing/unstable
> APT prefers testing
> APT policy: (500, 'testing')
> Architecture: i386 (i686)
> Shell: /bin/sh linked to /bin/bash
> Kernel: Linux 2.6.17-2-686
> Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
>
> Versions of packages xvnc4viewer depends on:
> ii libc6 2.3.6-15 GNU C Library: Shared libraries
> ii libgcc1 1:4.1.1-13 GCC support library
> ii libice6 1:1.0.1-2 X11 Inter-Client Exchange library
> ii libsm6 6.8.2.dfsg.1-10 X Window System Session Management
> ii libstdc++6 4.1.1-13 The GNU Standard C++ Library v3
> ii libx11-6 6.8.2.dfsg.1-10 X Window System protocol client li
> ii libxext6 6.8.2.dfsg.1-10 X Window System miscellaneous exte
> ii zlib1g 1:1.2.3-6 compression library - runtime
>
> xvnc4viewer recommends no packages.
>
> -- no debconf information
>
>

--
--------------------- Ola Lundqvist ---------------------------
/ opal RemoveThis @debian.org Annebergsslingan 37 \
| ola RemoveThis @opalsys.net 654 65 KARLSTAD |
| +46 (0)54-10 14 30 +46 (0)70-332 1551 |
| http://opalsys.net/ UIN/icq: 4912500 |
\ gpg/f.p.: 7090 A92B 18FE 7994 0C36 4FE4 18A1 B1CF 0FE5 3DD9 /
---------------------------------------------------------------


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Kamaraju Kusumanchi

External


Since: Dec 01, 2006
Posts: 16



(Msg. 3) Posted: Tue Apr 10, 2007 5:30 pm
Post subject: Bug#418214: xvnc4viewer: man page does not explain the encoding mechanisms [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
>
> Hi Kamaraju
>
> I know that this is a problem. However I do not have a good source of
> information. The tight encoding is not the same as the vnc4 codings.
>
> If you can point me to a good location, where this is described I'll be
> very happy.
>
> Regards,
>

The book "Linux Server Hacks Volume Two" by Bill Von Hagen, Brian K.
Jones describes various encoding schemes in pg-53 hack #10 "Access
Systems Remotely with VNC". The book does not distinguish between
tightvnc and realvnc when they describe what each encodings does.

So I am assuming that there is no difference between tightvnc and
realvnc when it comes to "what each encoding does". However, I could
be totally wrong as well.

raju
--
Kamaraju S Kusumanchi
http://www.people.cornell.edu/pages/kk288/
http://malayamaarutham.blogspot.com/


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Kamaraju Kusumanchi

External


Since: Dec 01, 2006
Posts: 16



(Msg. 4) Posted: Wed Apr 11, 2007 11:50 pm
Post subject: Bug#418214: xvnc4viewer: man page does not explain the encoding mechanisms [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On 4/11/07, Ola Lundqvist <ola.TakeThisOut@opalsys.net> wrote:
> Hi Kamaraju
>
> On Tue, Apr 10, 2007 at 04:23:37PM -0400, Kamaraju Kusumanchi wrote:
> > >
> > >Hi Kamaraju
> > >
> > >I know that this is a problem. However I do not have a good source of
> > >information. The tight encoding is not the same as the vnc4 codings.
> > >
> > >If you can point me to a good location, where this is described I'll be
> > >very happy.
> > >
> > >Regards,
> > >
> >
> > The book "Linux Server Hacks Volume Two" by Bill Von Hagen, Brian K.
> > Jones describes various encoding schemes in pg-53 hack #10 "Access
> > Systems Remotely with VNC". The book does not distinguish between
> > tightvnc and realvnc when they describe what each encodings does.
> >
> > So I am assuming that there is no difference between tightvnc and
> > realvnc when it comes to "what each encoding does". However, I could
> > be totally wrong as well.
>
> Each encoding type is of course the same independent of if it is
> tightvnc or realvnc, however tightvnc and realvnc do not support
> the same encodings.
>
> I do not have that book so I do not know what it describes.
>
> Regards,
>
> // Ola

According to the book, the encodings supported by TightVNC are

CopyRect
CoRRE
Hextile
Raw
RRE
Tight
Zlib

RealVNC supports only 3 (as explained in the man page)
Hextile
Raw
ZRLE

So they both have two encodings in common.

I do not know if I can copy paste the explanations given for each
encoding as it might violate some copyright laws. But the information
is there if needed.

thanks
raju


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Ola Lundqvist

External


Since: Nov 23, 2006
Posts: 91



(Msg. 5) Posted: Thu Apr 12, 2007 5:00 am
Post subject: Bug#418214: xvnc4viewer: man page does not explain the encoding mechanisms [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Hi Kamaraju

On Wed, Apr 11, 2007 at 10:41:22PM -0400, Kamaraju Kusumanchi wrote:
> On 4/11/07, Ola Lundqvist <ola.TakeThisOut@opalsys.net> wrote:
> >Hi Kamaraju
> >
> >On Tue, Apr 10, 2007 at 04:23:37PM -0400, Kamaraju Kusumanchi wrote:
> >> >
> >> >Hi Kamaraju
> >> >
> >> >I know that this is a problem. However I do not have a good source of
> >> >information. The tight encoding is not the same as the vnc4 codings.
> >> >
> >> >If you can point me to a good location, where this is described I'll be
> >> >very happy.
> >> >
> >> >Regards,
> >> >
> >>
> >> The book "Linux Server Hacks Volume Two" by Bill Von Hagen, Brian K.
> >> Jones describes various encoding schemes in pg-53 hack #10 "Access
> >> Systems Remotely with VNC". The book does not distinguish between
> >> tightvnc and realvnc when they describe what each encodings does.
> >>
> >> So I am assuming that there is no difference between tightvnc and
> >> realvnc when it comes to "what each encoding does". However, I could
> >> be totally wrong as well.
> >
> >Each encoding type is of course the same independent of if it is
> >tightvnc or realvnc, however tightvnc and realvnc do not support
> >the same encodings.
> >
> >I do not have that book so I do not know what it describes.
> >
> >Regards,
> >
> >// Ola
>
> According to the book, the encodings supported by TightVNC are
>
> CopyRect
> CoRRE
> Hextile
> Raw
> RRE
> Tight
> Zlib

This must be the latest version of tightvnc, or is it the version
in Debian as well. I must admit that I have not checked it that well.

> RealVNC supports only 3 (as explained in the man page)
> Hextile
> Raw
> ZRLE
>
> So they both have two encodings in common.

That is what I know as well.

> I do not know if I can copy paste the explanations given for each
> encoding as it might violate some copyright laws. But the information
> is there if needed.

It depends on the copyright of the book. I do unfortunatly not know
that.

However if it is rephrased enough it should be possible to
include.

But maybe it is easier to contact the tightvnc upstream author
to ask him to describe it better in the manpage. Smile

Regards,

// Ola

> thanks
> raju
>

--
--- Ola Lundqvist systemkonsult --- M Sc in IT Engineering ----
/ ola.TakeThisOut@opalsys.net Annebergsslingan 37 \
| opal.TakeThisOut@debian.org 654 65 KARLSTAD |
| http://opalsys.net/ Mobile: +46 (0)70-332 1551 |
\ gpg/f.p.: 7090 A92B 18FE 7994 0C36 4FE4 18A1 B1CF 0FE5 3DD9 /
---------------------------------------------------------------


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