[Spice-devel] How to config video and image compression?

[Uri Lublin]

On 02/27/2017 04:01 AM, John Y. wrote:
> I'm sorry that I misled you.
> The guest OS is windows 7 so that I cannot use virgl.
> I got the configuration from libvirt.org <http://libvirt.org> and I
> don't know which configuration will work for me, so I pasted all in the
> mail.
>
> Do you mean the default configuration the best suited for my case?


If you run your VM "locally" (the server and the client
are running on the same machine) you probably do not gain
from image-compression/video-streaming.


>
> 2017-02-27 0:58 GMT+08:00 Uri Lublin <uril at redhat.com
> <mailto:uril at redhat.com>>:
>
>     On 02/23/2017 09:43 AM, John Y. wrote:
>
>         I learned that video and image compression can be chosen server
>         initiation from
>         https://www.spice-space.org/spice-user-manual.html
>         <https://www.spice-space.org/spice-user-manual.html>.
>         How can I change the configuration for the compression ?
>
>         I want to play 720p video smoothly in the guest(some loss or
>         distortion
>         does not matter).
>         What is the best configuration for me?
>
>         I got that I can change option of graphics in libvirt like:
>         <graphics type='spice' port='-1' tlsPort='-1' autoport='yes'>
>           <channel name='main' mode='secure'/>
>           <channel name='record' mode='insecure'/>
>           <image compression='auto_glz'/>
>           <streaming mode='filter'/>
>           <clipboard copypaste='no'/>
>           <mouse mode='client'/>
>           <filetransfer enable='no'/>
>           <gl enable='yes'
>         rendernode='/dev/dri/by-path/pci-0000:00:02.0-render'/>
>         </graphics>
>
>         Which option should I change ?
>
>         Can I also customize more parameter about the vga(such as fps,
>         bitrate
>         ...) ?
>
>         Regards,
>         John
>
>
>
>     Hi John,
>
>     What is the guest OS?
>
>     According to your configuration above, I assume you are
>     running the VM locally on your workstation.
>     Also I see you are trying to use virgl (gl enable=yes)
>     If this is the case, for Linux guests, you need not to worry about
>     image/video compression.
>     Just make sure you are using virtio-vga and that the
>     given 'rendernode' is correct and accessible,
>     and that you have new enough qemu-kvm/spice-server and
>     remote-viewer or virt-manager.
>
>     Regards,
>         Uri.
>
>