c# - Saving current frame of video-Windows Store app -

i have scenario pick video library , save frame image on clicking button. can capture current frame of video playing in wpf.

i had done in windows phone 8-

        writeablebitmap bmpcurrentscreenimage = new writeablebitmap((int)media.actualwidth, (int)media.actualheight);         bmpcurrentscreenimage.render(media, new matrixtransform());         bmpcurrentscreenimage.invalidate();         try         {             using (var stream = new memorystream())             {                 bmpcurrentscreenimage.savejpeg(stream, bmpcurrentscreenimage.pixelwidth, bmpcurrentscreenimage.pixelheight, 0, 100);                 stream.seek(0, seekorigin.begin);                 bitmapimage bi = new bitmapimage();                 bi.setsource(stream);                 img.source = bi;             }         }         catch (exception exp)         { } 

but in windows store app writablebitmap class has no such function savejpeg() used writeablebitmaprenderextensions toolkit- writeablebitmap w = await writeablebitmaprenderextensions.render(mymedia); w.invalidate(); thumb.source = w; not working media element only.

on goggling found post similar mine this post can't understand how can use since in c++ , creating app c#.

you can use emgu cv frame work live capturing , working on video file.here link official page of emgu community explaining example.