Convert PPTX to video in C#

Powerful cross-platform .NET API for converting PowerPoint to video using C# code on NET Framework, .NET Core, Windows Azure, Mono or Xamarin Platforms

Convert PowerPoint to video using Aspose.Slides

Aspose.Slides for .NET is a powerful .NET library used to create, edit and manipulate presentations and also convert PowerPoint presentations to other documents and videos. In this case, to convert PowerPoint to video, you need to use Aspose.Slides alongside ffmpeg and FFMpegCore (a free NET ffmpeg wrapper).

This is how the PPTX to video conversion process works: Aspose.Slides is used to generate a set of frames (from the presentation slides) and then FFMpegCore (ffmpeg) is used to create a video based on the frames.

How to convert PPTX to video

Install Aspose.Slides for .NET and FFMpegcore: Run dotnet add package Aspose.Slides.NET --version 22.12.0 and then run dotnet add package FFMpegCore --version 4.8.0
Download ffmpeg here.
FFMpegCore requires you to specify the path to the downloaded ffmpeg (e.g. extracted to “C:\tools\ffmpeg”): GlobalFFOptions.Configure(new FFOptions { BinaryFolder = @"c:\tools\ffmpeg\bin",} );
Copy, paste, and then run the PowerPoint to video code.

Convert PowerPoint to video in C#

Use this code to convert PPTX to video:

C# code for converting PowerPoint to video
using System.Collections.Generic;
using Aspose.Slides;
using FFMpegCore; // Will use FFmpeg binaries we extracted to "c:\tools\ffmpeg" before
using Aspose.Slides.Animation;
using (Presentation presentation = new Presentation())

{
    // Adds a smile shape and then animates it
    IAutoShape smile = presentation.Slides[0].Shapes.AddAutoShape(ShapeType.SmileyFace, 110, 20, 500, 500);
    IEffect effectIn = presentation.Slides[0].Timeline.MainSequence.AddEffect(smile, EffectType.Fly, EffectSubtype.TopLeft, EffectTriggerType.AfterPrevious);
    IEffect effectOut = presentation.Slides[0].Timeline.MainSequence.AddEffect(smile, EffectType.Fly, EffectSubtype.BottomRight, EffectTriggerType.AfterPrevious);
    effectIn.Timing.Duration = 2f;
    effectOut.PresetClassType = EffectPresetClassType.Exit;

   const int Fps = 33;
   List<string> frames = new List<string>();

   using (var animationsGenerator = new PresentationAnimationsGenerator(presentation))
    using (var player = new PresentationPlayer(animationsGenerator, Fps))
    {
        player.FrameTick += (sender, args) =>
        {
            string frame = $"frame_{(sender.FrameIndex):D4}.png";
            args.GetFrame().Save(frame);
            frames.Add(frame);
        };
        animationsGenerator.Run(presentation.Slides);
    }

    // Configure ffmpeg binaries folder. See this page: https://github.com/rosenbjerg/FFMpegCore#installation
    GlobalFFOptions.Configure(new FFOptions { BinaryFolder = @"c:\tools\ffmpeg\bin", });
    // Converts frames to webm video
    FFMpeg.JoinImageSequence("smile.webm", Fps, frames.Select(frame => ImageInfo.FromPath(frame)).ToArray());

}

Other Supported Conversions

You can also convert PowerPoint to files in other formats