[Qemu-devel] Question and probable bug in qemu spice's parameters

[Qemu-devel] Question and probable bug in qemu spice's parameters

[Fabio Fantoni]

In qemu docs seems that spice streaming video is default to "filter" but 
after this patch seems default to "off" without updating qemu-options.hx 
file: 
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=f1d3e586f069e17f83b669842bc02d60d509daca
What is the correct default actually?

If I specify spice image compression, qemu doesn't start and gives me 
this error:
spice: invalid stream video control: (null)

To solve I have to set also qemu spice's streaming video parameters.

Why qemu doesn't take automatically the default of spice image 
compression in this case?

Thanks for any reply.

Re: [Qemu-devel] Question and probable bug in qemu spice's parameters

[Gerd Hoffmann]

On Fr, 2015-01-09 at 11:30 +0100, Fabio Fantoni wrote:
> In qemu docs seems that spice streaming video is default to "filter" but 
> after this patch seems default to "off" without updating qemu-options.hx 
> file: 
> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=f1d3e586f069e17f83b669842bc02d60d509daca
> What is the correct default actually?

It should be filter, but the filter heuristics actually has trouble
distinguishing real videos from gnome desktop, resulting in bad display
quality.  Switching to "off" was meant to be a temporary stopgap for
that.

Anyone can comment what is the state here?  Became the heuristic better
meanwhile, so we can flip it back to filter?  Otherwise we should
probably fixup the docs to match reality ...

> If I specify spice image compression, qemu doesn't start and gives me 
> this error:
> spice: invalid stream video control: (null)

Hmm, can't reproduce.
What is the exact command line leading to this error?

cheers,
  Gerd

Re: [Qemu-devel] Question and probable bug in qemu spice's parameters

[Fabio Fantoni]

Il 09/01/2015 12:23, Gerd Hoffmann ha scritto:
> On Fr, 2015-01-09 at 11:30 +0100, Fabio Fantoni wrote:
>> In qemu docs seems that spice streaming video is default to "filter" but
>> after this patch seems default to "off" without updating qemu-options.hx
>> file:
>> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=f1d3e586f069e17f83b669842bc02d60d509daca
>> What is the correct default actually?
> It should be filter, but the filter heuristics actually has trouble
> distinguishing real videos from gnome desktop, resulting in bad display
> quality.  Switching to "off" was meant to be a temporary stopgap for
> that.
>
> Anyone can comment what is the state here?  Became the heuristic better
> meanwhile, so we can flip it back to filter?  Otherwise we should
> probably fixup the docs to match reality ...
>
>> If I specify spice image compression, qemu doesn't start and gives me
>> this error:
>> spice: invalid stream video control: (null)
> Hmm, can't reproduce.
> What is the exact command line leading to this error?

Sorry, I saw only now that this is caused by my mistake in one libxl 
patch to implement it.

>
> cheers,
>    Gerd
>
>