[Spice-devel] Information about video detection

[bigclouds]

hi,
1.
in this post, it mentions RED_STREAM_FRAMES_START___CONDITION, i do not find it in source code.
2.
what is the threshold of video detect?
3.action of excel opertions are very slow, could you tell me where(source code) i should look into to locate this problem?
 
thanks




在 2013-07-02 22:47:35，"Matilde Yanez" <yanez.matilde at gmail.com> 写道：






2013/7/2 Yonit Halperin <yhalperi at redhat.com>

On 07/02/2013 10:22 AM, Matilde Yanez wrote:


Hi,
thanks for answers.

2013/7/2 Yonit Halperin <yhalperi at redhat.com <mailto:yhalperi at redhat.com>>


    Hi,

    On 07/01/2013 04:27 AM, Matilde Yanez wrote:

        Hello,

        I need some information about video detection, on VM.
        When I am on web pages, or documents, with images the VM seems
        to detect
        video and start the mjpeg_encoder process.
        Thus, the display is slows down.

    What vm are you using? We encountered such behaviour with
    gnome-shell, due to high frequency updates of regions over the
    primary surface.


On CentOs and Windows VMs, indeed with high frequency updates of regions
it considers that is video. Such as large Excel documents or web page
with many images. Adding log I can see that spice server starts stream,
and does the same treatment as video.

Have you used the default setting of streaming-video (streaming-video=filter), or did you use streaming-video=on? Can you send me an example document and the Microsoft Office version you are using?


Using the default setting of streaming-video, scroling on "http://www.lemonde.fr/" for exemple.
The Microsoft version is 14.0.4730.1010 (Office Professional Plus 2010).
 


        With argument streaming-video=off, the CPU consomation goes up.

    This is unexpected. On which guest scenarios?


When I play a movie, with default "streaming-video" arguments, on
windows VM, I am around 60% of CPU consomation of VM's qemu process
("top" command), and with "streaming-video=off" I am around 120%.
Due to all images that are send to refresh client display?


Ok, it is expected for movie playback. I thought you meant that it happens for the document browsing.
        Increasing the value of "RED_STREAM_FRAMES_START___CONDITION",

        does not
        launch the video detection on these documents and keep fluidity on
        videos and documents

        How can i make difference between real video, and documents with
        images?

    I'm afraid there is no simple answer for this
    (1) Why does the driver send frequent updates? Does the rectangles
    that are being updated really change? Can it be prevented on the
    driver side?
    (2) If the area that is being refreshed doesn't change much, we can
    apply a quick comparison of sampled regions of 2 successive
    "frames", and if most of the pixels stay the same, we won't consider
    those "frames" as part of a video stream. (for such scenarios we
    would also like to improve and employ the GLZ encoding, or change
    our caching mechanism, to be applied on slices of bitmaps)


I think I will investigate on the 2nd point.

           On what part of the spice-server code can i make changes?

    Code that is related to video streams is located in red_worker.c, in
    routines with "stream|upgrade" in their names.


        Thanks,
        Matilde.

    Regards,
    Yonit.


Matilde.


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