MediaComposition

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question

PaweMilitowski-2843 asked Oct 24, '21 PaweMilitowski-2843 edited Oct 25, '21

MediaComposition

I am using MediaComposition to scale the video. I am creating a MediaEncodingProfile:

 var mediaEncodingProfile = mediaComposition.CreateDefaultEncodingProfile();

I am creating a MediaClip and adding it to MediaComposition

 var video = await MediaClip.CreateFromFileAsync(videoFile);
 this.mediaComposition.Clips.Add(video);

And I set the height and width of the video in mediaEncodingProfile.

 mediaEncodingProfile.Video.Width = newWidth
 mediaEncodingProfile.Video.Height = newHeight

When newWidth and newHeight are larger than the height and width of the video, the colors are lighter than they should be

 mediaComposition.GenerateMediaStreamSource(this.mediaEncodingProfile)

Can I somehow turn off automatic color changing?

windows-uwp

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Answer 1 · 2021-10-25T06:46:18.81Z

NicoZhu-MSFT answered Oct 25, '21

Hello,
Welcome to Microsoft Q&A!

When newWidth and newHeight are larger than the height and width of the video, the colors are lighter than they should be

It's by default when you zoom in the original video size. such as 320*240->1280*720. Total pixels number will increase many times, but available pixels still 320*240. So the color will be light.

As you mention above, it looks like Image quality enhancer, currently, MediaComposition has not provide such api could enhance the color automatically. You may refer to custom video effect document and re-render video after above.

Thank you.

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Answer 2 · 2021-10-25T13:46:51.28Z

PaweMilitowski-2843 answered Oct 25, '21 PaweMilitowski-2843 edited Oct 25, '21

@NicoZhu-MSFT Thank you for your answer

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