On 15/11/15 16:51, Zenny wrote:
On 11/15/15, Antoine Martin <[email protected]> wrote:
On 15/11/15 14:44, Zenny wrote:
Hi,
xpra is very interesting, but I am encountering an issue or say cannot
figure out exactly how to achieve the following.
1. Start a xvfb based virtual x instance in a resolution say 4k
(3840x2160) in one machine (server) with say libreoffice impress, and
broadcast using 'xpra shadow :10"
Please include the exact command line used for starting the Xvfb and
libreoffice.
$ Xvfb :10 -screen 0 4096x2160x24+32 -fbdir /var/tmp &
$ export DISPLAY=:10.1
Could this be a typo? I've used this instead:
export DISPLAY=:10
$ libreoffice & / i3 & / lxsession -s LUBUNTU -e LXDE
Both libreoffice and lxsession crash when I try on Fedora 23, with Xvfb
or Xdummy.
$ xpra shadow :10
2. Access that instance from another machine (laptop) using 'xpra
attach ssh:hostname:10'
$ xpra attach ssh:HOSTNAME:10
3. Screencapture the :10 inside the same machine at 4K.
Using which tool?
initially with ffmpeg and then with xwd / maim
Command lines?
I started an xterm with "xterm -geometry 600x100" and captured it fine
with scrot.
Both with Xvfb and Xdummy.
But it does not allow me to capture in 4K but at the same resolution
as of the rendering laptop.
I have tested here with Xdummy and that worked fine.
With Xdummy, once I attach to the remote machine with xpra, the ffmpeg
fails as it says "the capturing region lies out of the range." or
something like this.
Having the exact command line and error message may help.
I checked Xdummy related to Ubuntu instruction at
https://www.xpra.org/trac/wiki/Xdummy, but to no avail.
Are you using Xvfb or Xdummy? What distribution and version?
Tried with Xvfb, didn't work and then with Xdummy. Still experimenting. ;-)
$ lsb_release -a
LSB Version:
core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
xpra is at v0.15.8-2 and xvfb is at v1.15.1-0ubuntu2.7
Xdummy is problematic on Ubuntu - it is disabled for most Ubuntu versions.
Any hints would be highly appreciated. Thanks!
You may also be interested in the following 0.16 features:
* ability to NOT change the virtual display to match the client's
resolution using:
XPRA_RANDR=0 xpra start ...
See:
http://xpra.org/trac/changeset/11229
Shadow mode is A LOT less efficient than the regular "start" mode.
* desktop scaling, which allows you to upscale or downscale the server
resolution when displayed on the client:
http://xpra.org/trac/ticket/976
So you could render at 4k and display at 2k for example (though the main
purpose of this ticket is to do the opposite to save bandwidth).
* "sync-xvfb" fix for screen capture tools:
http://xpra.org/trac/ticket/988
Very interesting. Is there a binary of this dev release?
There are fairly recent builds here:
http://xpra.org/beta
Cheers
Antoine
Thanks for taking time to reply.
Cheers,
/z
Cheers
Antoine
Cheers,
/z
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