[pve-devel] novnc report

Alexandre DERUMIER aderumier at odiso.com
Thu Aug 2 11:47:58 CEST 2012


>>That is simply a test how stable the software is.
>>
>>Last time I checked it crashed within 30 seconds.

I have just tested it, no crash, playing youtube video 5min.
(But indeed, it's very slow)

>>I guess the best compression should be selected automatically, but not sure about that.
>>Last time I talked with the author he claimed that jpeg compression is fastest.

I think we can use png or jpeg inside differents protocol, and indeed jpeg compression is faster. 
found this.
http://wiki.qemu.org/Google_Summer_of_Code_2010/VNC

tight procotol use jpeg by default, and it exist also tight-png.
novnc supported only tight-png in past, but since 0.3 classic tight protocol is supported.

----- Mail original -----

De: "Dietmar Maurer" <dietmar at proxmox.com>
À: "Alexandre DERUMIER" <aderumier at odiso.com>
Cc: pve-devel at pve.proxmox.com
Envoyé: Jeudi 2 Août 2012 11:19:17
Objet: RE: [pve-devel] novnc report

> >> Does it work when you view a video from youtube.com?
> Didn't have tried, but why do we want view a video in proxmox console ?
> Isn't it mainly for administrative tasks ?

That is simply a test how stable the software is.

Last time I checked it crashed within 30 seconds.

> I'm not sure vnc protocol is fast enough for true video rendering.
> spice should be better for this task.(in vdi environnement)
>
>
> >>AFAIK the jpeg compression is far better?
> but jpeg is not a vnc protocol ? (but is used inside these prococol)
> http://tightvnc.com/vncviewer.1.html
> "Tight
> Like Zlib encoding, Tight encoding uses zlib library to compress the pixel data,
> but it pre-processes data to maximize compression ratios, and to minimize
> CPU usage on compression. Also, JPEG compression may be used to encode
> color-rich screen areas (see the description of -quality and -nojpeg options
> above). Tight encoding is usually the best choice for low-bandwidth network
> environments (e.g. slow modem connections)."

I guess the best compression should be selected automatically, but not sure about that.

Last time I talked with the author he claimed that jpeg compression is fastest.

- Dietmar



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Alexandre D e rumier

Ingénieur Systèmes et Réseaux


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