[Spice-devel] we need help about video problem!!!

Snir Sheriber ssheribe at redhat.com
Wed Jul 11 07:00:59 UTC 2018


Hi,


On 07/10/2018 03:25 PM, molo wrote:
> hi,
>    I am sorry to trouble you!
>    We encountered the problem of video picture jam in the process of 
> using the spice protocol, and the audio and video out of sync problem 
> also appeared in the drag and drop player window. When trying to solve 
> the problem, we changed the encoding method from mjpeg to h264, but 
> the problem didn't seem to improve. After that we tried to encode with 
> hardware, but it failed. It seems that kvm can't access NVIDIA's 
> device driver.
>    Two question as follows:
>    1、I want to confirm whether kvm can access the hardware driver and 
> perform hardware coding?
>    2、Have you ever encountered video jams, audio and video out of 
> sync? How to solve it? Wouldn't it be better to decode on the client 
> side via hardware?

As Victor mentioned video encoding is using x264enc. if i'm not mistaken 
it's predefined to ultrafast encoding
which may cause video jams (since it is sw encoding high quality 
encoding will probably be too slow and high cpu
consumer).
IIRC audio and video should be synchronized in both cases.
Client side should use hw decoding in case hw gstreamer decoder plugin 
is available (although some additional
sw graphical operations may be done by spice after the decoding phase)

Snir.

>     spice-protocol:0.12.14 release
>     client:our  software based spice-gtk(0.35 release)
>     spice-server:0.14 release
>
> Hope that I will receive your reply soon。ths!
> Sincerely:yxh
>
>
> _______________________________________________
> Spice-devel mailing list
> Spice-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/spice-devel

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