add CFilter for CVImageBufferRef in Gocoder SDK ios not effect?

[dungdt9x]

Hi guys, i try to use this code to add CIFilter for imageBuffer. But when i run in device, i dont see any change and dont see effect for camera also When i debug i can see frameImage is an image with gray color. Please help me

• (void) videoFrameWasCaptured:(nonnull CVImageBufferRef)imageBuffer framePresentationTime:(CMTime)framePresentationTime frameDuration:(CMTime)frameDuration { if (self.goCoder.isStreaming) {

  if (self.blackAndWhiteVideoEffect) {
    // convert frame to b/w using CoreImage tonal filter
    CIImage *frameImage = [[CIImage alloc] initWithCVImageBuffer:imageBuffer];
    CIFilter *grayFilter = [CIFilter filterWithName:@"CIPhotoEffectTonal"];
    [grayFilter setValue:frameImage forKeyPath:@"inputImage"];
    frameImage = [grayFilter outputImage];
  
    CIContext * context = [CIContext contextWithOptions:nil];
    [context render:frameImage toCVPixelBuffer:imageBuffer];
  }

  } }

[mleavy]

That only affects the video stream, not the preview.