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https://issues.apache.org/jira/browse/GUACAMOLE-963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17324143#comment-17324143
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Mike Jumper commented on GUACAMOLE-963:
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{quote}
But that one has been marked as resolved.
{quote}

GUACAMOLE-421 was closed as invalid as it's not a bug - it's Guacamole 
representing the VNC display exactly as the VNC server requested. The JIRA 
issue we're on here was opened later as a feature request to allow Guacamole to 
specifically support {{-ncache}} and re-interpret what the VNC server is 
requesting in that light.

{quote}
I can even watch a youtube video ... That is definitely not possible when 
connecting from/to the same devices via Guacamole ...
{quote}

It should be. I do this myself without issue.

If the VNC leg of the connection is going over the internet, then perhaps not 
so much. If it's going over a private network, then guacd should do a decent 
job recognizing the video-like content and switch over to lossy compression 
with dynamic quality.

That all has nothing to do with {{-ncache}}, though.

> Add support for x11vnc -ncache
> ------------------------------
>
>                 Key: GUACAMOLE-963
>                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-963
>             Project: Guacamole
>          Issue Type: New Feature
>          Components: VNC
>            Reporter: Octavia Togami
>            Priority: Minor
>
> I would like Guacamole to support x11vnc's {{-ncache}} option.
> In my mind there are two possible ways to do this: either allowing users to 
> crop out sections of the connection (they would still need to be persisted in 
> the VNC client's memory, though this does save on network transmission to the 
> Guacamole client); or allow users to scale the view by _width_ rather than 
> _height_. The latter would implicitly hide the ncache space off-screen if the 
> width of the screen matches that of the other screen, though it wouldn't work 
> very well if they aren't the same.



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