.NET Video Editing Code Examples & Tutorials¶

Video Edit SDK .Net

This page collects ready-to-use C# recipes for the most common editing scenarios using the Video Edit SDK .Net. Every snippet is verified against the SDK source and demos under Video Edit SDK. The recipes below use the Windows-only VideoEditCore engine. Cross-platform code based on VideoEditCoreX follows a similar shape with engine-specific source and effect types.

Available Recipes¶

Visual Effects & Overlays¶

Adding Image Overlays to Video — Learn how to superimpose images on your video content
Text Overlay Implementation — Techniques for adding and formatting text overlays on videos
Picture-In-Picture Effects — Create professional PiP effects in your video applications

Audio Manipulation¶

Audio Volume Envelope Effects — Control audio volume changes over time
Multiple Audio Streams in AVI Files — Working with multiple audio tracks
Custom Volume Control for Audio Tracks — Precise audio level management techniques

Video Composition¶

Creating Videos from Multiple Sources — Combine various input files into a single output
Working with Video Segments — Extract and use multiple segments from the same source file
Transition Effects Between Video Fragments — Implementing smooth transitions between clips
Generating Videos from Image Sequences — Console application example for image-to-video conversion
Multi-Audio Stream Video Integration — Working with complex audio-video combinations

iOS¶

iOS Video Editor — Building video editing apps for iPhone and iPad

Recipe — Join Multiple Source Files into a Single MP4¶

VideoSource accepts a filename plus optional start/stop times. To trim a section from a source, pass the start and stop offsets; to use the whole file, pass null. Each call to Input_AddVideoFile appends to the timeline.

using System;
using System.Threading.Tasks;
using VisioForge.Core.Types.VideoEdit;
using VisioForge.Core.VideoEdit;
using VisioForge.Core.Types.Output;

public async Task JoinClipsAsync(string output)
{
    var videoEdit = new VideoEditCore();

    // Output container.
    videoEdit.Output_Filename = output;
    videoEdit.Output_Format = new MP4Output();

    // First clip — first 10 seconds.
    var clip1 = new VideoSource(
        @"intro.mp4",
        TimeSpan.Zero,
        TimeSpan.FromSeconds(10),
        VideoEditStretchMode.Letterbox);
    await videoEdit.Input_AddVideoFileAsync(clip1);

    // Second clip — the whole file appended to the timeline.
    var clip2 = new VideoSource(
        @"content.mp4",
        null,
        null,
        VideoEditStretchMode.Letterbox);
    await videoEdit.Input_AddVideoFileAsync(clip2);

    // Third clip — the whole file appended.
    var clip3 = new VideoSource(
        @"outro.mp4",
        null,
        null,
        VideoEditStretchMode.Letterbox);
    await videoEdit.Input_AddVideoFileAsync(clip3);

    // Run the engine.
    await videoEdit.StartAsync();
}

Recipe — Add an Image Logo Overlay¶

VideoEffectImageLogo is the legacy image-overlay effect. Create it with a unique effect name (the second constructor argument), assign the image file via Filename, and add it to the engine. Position is controlled by Left/Top (in pixels) when no automatic alignment is used.

using VisioForge.Core.Types.VideoEdit;
using VisioForge.Core.VideoEdit;
using VisioForge.Core.Types.Output;
using VisioForge.Core.Types.VideoEffects;

public async Task AddLogoAsync(string source, string output)
{
    var videoEdit = new VideoEditCore();

    videoEdit.Output_Filename = output;
    videoEdit.Output_Format = new MP4Output();

    var video = new VideoSource(source, null, null, VideoEditStretchMode.Letterbox);
    await videoEdit.Input_AddVideoFileAsync(video);

    // Image logo overlay (PNG with alpha is recommended for transparent logos).
    var logo = new VideoEffectImageLogo(enabled: true, name: "logo1")
    {
        Filename = "logo.png",
        Left = 10,
        Top = 10
    };
    videoEdit.Video_Effects_Add(logo);

    await videoEdit.StartAsync();
}

Recipe — Replace the Source Audio With a Music Track¶

Add the video file as a video-only source (via targetStreamIndex-aware overloads of Input_AddVideoFile if needed), then add a separate AudioSource for the music track. The AudioSource constructor accepts a filename plus optional start/stop offsets.

using VisioForge.Core.Types.VideoEdit;
using VisioForge.Core.VideoEdit;
using VisioForge.Core.Types.Output;

public async Task ReplaceAudioAsync(string source, string music, string output)
{
    var videoEdit = new VideoEditCore();

    videoEdit.Output_Filename = output;
    videoEdit.Output_Format = new MP4Output();

    // Source video (original audio is ignored by the engine when a separate
    // AudioSource is added; see Input_AddAudioFile overloads to control mixing).
    var video = new VideoSource(source, null, null, VideoEditStretchMode.Letterbox);
    await videoEdit.Input_AddVideoFileAsync(video);

    // Background music — full file.
    var music_src = new AudioSource(music);
    await videoEdit.Input_AddAudioFileAsync(music_src);

    await videoEdit.StartAsync();
}

Additional Resources¶

Find more extensive code samples and resources on our GitHub repository, where we regularly update our collection with new examples and implementation techniques for .NET developers.