help:cairooverlay on win32 makes high cpu usage

[Nicolas Dufresne]

Le 1 juil. 2017 6:58 AM, "方明" <77949218 at qq.com> a écrit :


hi everyone

   I developed a element ,which work like textoverlay but use cairo to draw

line or rect on a surface .


Textoverlay also uses Cairo to draw the glyph, just to clarify.


then call gst_video_overlay_composition_add_rectangle to video buffer(N
times)

and then call gst_video_overlay_composition_blend.

lastly push to dshowvideosink(I am working in win32).

It can work,but result in high cpu usage.

how can I improve its performace ?


You should use a profiler to identify the bottleneck. Then it will be
easier to know what need to be optimized. It's possible that adding
CompositionMeta support to dshowviseosink is what you want.



Thanks.

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