VideoContactSheet 1.0.1

VideoContactSheet (.NET)

A C# port of vcs.rb — a Video Contact Sheet generator. It extracts frames from a video at regular intervals and composes them into a grid ("contact sheet") with a metadata header, optional title, per-thumbnail timestamps, drop shadows, polaroid frames, and a signature footer.

• Frame capture & metadata: FFMpegCore — wraps ffmpeg / ffprobe; binaries can be on PATH or pointed to via ffBinaryFolder
• Composition / drawing: SkiaSharp (MIT) — chosen for its native drop-shadow, text, and canvas compositing support
• Targets: .NET 10, cross-platform (Windows / Linux / macOS)

Example

A 4×4 contact sheet with a custom footer:

using VideoContactSheet;

var video = new Video("ons3on3cup_hdtv.mp4");

var options = new ContactSheetOptions
{
    Columns = 4,
    Rows = 4,
    Signature = "Made in .NET with VideoContactSheet",
};

await video.SaveContactSheetAsync("example-contact-sheet.png", options);

Or with the CLI:

vcs ons3on3cup_hdtv.mp4 -c 4 -r 4 -s "Made in .NET with VideoContactSheet" -o example-contact-sheet.png

Requirements

• .NET 10 SDK
• ffmpeg and ffprobe binaries — the CLI project bundles Windows x64 binaries in its build output automatically (run tools/download-ffmpeg.ps1 first if they are missing). Alternatively supply ffBinaryFolder or put them on PATH.
• On headless Linux, you may also need libfontconfig1 for text rendering

Library usage

using VideoContactSheet;

// ffmpeg/ffprobe on PATH:
var video = new Video("movie.mkv");

// — or — binaries shipped next to the exe:
var video = new Video("movie.mkv", ffBinaryFolder: AppContext.BaseDirectory);

// Metadata
var info = await video.GetInfoAsync();
Console.WriteLine($"Duration: {info.Duration}, {info.Video?.Width}x{info.Video?.Height}");

// Build a 3x3 sheet
var options = new ContactSheetOptions
{
    Columns = 3,
    Rows = 3,
    ThumbnailWidth = 320,
    Format = SheetFormat.Jpg,
    Title = "My Movie",
    SoftShadow = true,
    Timestamp = true,
};
await video.SaveContactSheetAsync("out.jpg", options);

// Single frame
var bmp = await video.CaptureFrameAsync(TimeIndex.Parse("1:22"), width: 640, evadeBlank: true);

CLI

Install as a .NET global tool (requires ffmpeg/ffprobe on PATH):

dotnet tool install -g VideoContactSheet.Cli

The vcs CLI mirrors the original script's options:

vcs video.avi
vcs -i 3m30 input.wmv -o output.jpg
vcs --from 3m --to 18m -i 2m input.avi
vcs -c 4 -r 5 --polaroid --no-shadow -T "Holiday" clip.mp4

Run vcs --help for the full list. Use --ffmpeg-folder <dir> to point at a local copy of the binaries instead of relying on PATH.

Feature mapping vs. vcs.rb

Architecture

Video                     orchestrator (probe → capture → compose)
 ├─ FfprobeVideoInfoProvider   FFProbe.AnalyseAsync → VideoInfo
 ├─ IFrameCapturer             frame extraction abstraction
 │   └─ FfmpegCapturer         FFMpegCore pipe → PNG → SKBitmap
 ├─ TimeIndex                  flexible time parsing ("3m30", "1:22", "90")
 └─ ContactSheet               SkiaSharp grid composition + styling
     └─ ContactSheetOptions    all grid/style/filter settings

Swap in another capturer (libav, mplayer) by implementing IFrameCapturer and passing it to the Video constructor.

License

Mirror of a GPL-3.0 project; treat this port accordingly.