c# - MediaClip is not rendered with custom IBasicVideoEffect -


i trying apply saturation video effect implemented ibasicvideoeffect according https://github.com/aarononeal/media-contrib example.

when add videoeffectdefinition mediaclip, preview video set, nothing rendered. (video disappears)

private void addsaturationeffectbutton_click(object sender, routedeventargs e) {     var clip = _composition.clips[0];     clip.videoeffectdefinitions.add(new videoeffectdefinition(typeof(saturationvideoeffect).fullname));      setupmediastreamsource(); }

saturationvideoeffect implemented in separated windows runtime component (universal windows) project.

using system; using system.collections.generic; using windows.foundation.collections; using windows.graphics.directx.direct3d11; using windows.media.effects; using windows.media.mediaproperties; using microsoft.graphics.canvas; using microsoft.graphics.canvas.effects;  namespace videoeffectslibrary {     public sealed class saturationvideoeffect : ibasicvideoeffect     {         private videoencodingproperties _currentencodingproperties;         private canvasdevice _canvasdevice;         private ipropertyset _configuration;          private float saturation         {                         {                 if (_configuration != null && _configuration.containskey("saturation"))                     return (float)_configuration["saturation"];                 else                     return 0.5f;             }             set             {                 _configuration["saturation"] = value;             }         }          public void processframe(processvideoframecontext context)         {             using (canvasbitmap inputbitmap = canvasbitmap.createfromdirect3d11surface(_canvasdevice, context.inputframe.direct3dsurface))             using (canvasrendertarget rendertarget = canvasrendertarget.createfromdirect3d11surface(_canvasdevice, context.outputframe.direct3dsurface))             using (canvasdrawingsession ds = rendertarget.createdrawingsession())             {                 var saturation = new saturationeffect()                 {                     source = inputbitmap,                     saturation = this.saturation                 };                 ds.drawimage(saturation);             }         }          public void setencodingproperties(videoencodingproperties encodingproperties, idirect3ddevice device)         {             _currentencodingproperties = encodingproperties;             _canvasdevice = canvasdevice.createfromdirect3d11device(device);             canvasdevice.debuglevel = canvasdebuglevel.error;         }          public void setproperties(ipropertyset configuration)         {             _configuration = configuration;         }          public bool isreadonly { { return false; } }         public mediamemorytypes supportedmemorytypes { { return mediamemorytypes.gpu; } }         public bool timeindependent { { return false; } }          public ireadonlylist<videoencodingproperties> supportedencodingproperties         {                         {                 return new list<videoencodingproperties>()                 {                     // note: specifying width , height necessary due bug in media pipeline when                     // effect being used media capture.                      // can changed "0, 0" in future release of fbl_impressive.                      videoencodingproperties.createuncompressed(mediaencodingsubtypes.argb32, 800, 600)                 };             }         }          public void close(mediaeffectclosedreason reason)         {             // clean devices             if (_canvasdevice != null)                 _canvasdevice.dispose();         }          public void discardqueuedframes()         {             // no cached frames discard         }     } }

how can make effect run properly? help.


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