[Spice-devel] Trouble with lossy compression

[Christophe Fergeau]

Hey,

On Sun, Jul 10, 2016 at 11:00:46PM -0300, Adriano Moura wrote:
> I've been trying to use a virtual machine over wi-fi but I'm having trouble
> activating the lossy compression method in spice. I can reach about 50mbps
> but that does not cut with lossless compression while playing a video. I've
> tried all command switches for qemu related to spice compression methods,
> but no such luck. Here is an excerpt of the machine's xml config:
> 
>   <graphics type='spice' autoport='yes' listen='0.0.0.0'>
>     <listen type='address' address='0.0.0.0'/>
>   </graphics>
> [...]
>   <qemu:commandline>
>     <qemu:arg value='-spice'/>
>     <qemu:arg
> value='image-compression=auto-glz,streaming-video=all,jpeg-wan-compression=always,zlib-glz-wan-compression=auto,playback-compression=on'/>
>   </qemu:commandline>
> 
> Tried different values and checked if qemu's process is carrying those
> arguments. (it did)

libvirt has 'native' support for these arguments, see
https://libvirt.org/formatdomain.html#elementsGraphics , I'd recommend
using these XML nodes rather than trying to force things through
qemu:arg.

Christophe
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