Feature Release

Ytdlp.NET

Complete Fluent Library for yt-dlp in .NET
Version 3 introduces a fully redesigned fluent API with thread-safe command execution, probes, and batch operations.

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Table of Contents

1. Overview

2. Installation

3. Migration from v2 → v3

4. Core Concepts

   • YtdlpBuilder

   • YtdlpCommand

   • YtdlpProbe

5. YtdlpBuilder Methods

   • General Options

   • Network Options

   • Video Selection Options

   • Download Options

   • Filesystem Options

   • Thumbnail Options

   • Verbosity & Simulation Options

   • Workgrounds (headers)

   • Video Format Options

   • Subtitle Options

   • Authentication Options

   • Post-Processing Options

   • SponsorBlock Options

6. YtdlpCommand

   • ExecuteAsync

   • ExecuteBatchAsync

   • Events

7. YtdlpProbe

8. Examples

   • Single video download

   • Playlist download

   • Audio extraction

   • Subtitles & metadata

   • Probing

   • Batch downloads with concurrency

9. Best Practices & Tips

10. Error Handling

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Overview

Ytdlp.NET v3 is a fully fluent .NET wrapper around yt-dlp, designed to provide:

• Thread-safe execution of downloads and probes

• Fluent configuration using YtdlpBuilder

• Comprehensive events for progress, post-processing, and errors

• Batch downloads with controlled concurrency

• Full coverage of yt-dlp options

v3 is not backward-compatible with v2. The internal configuration is immutable and safe to reuse for multiple commands.

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Installation

Install via NuGet:

Install-Package Ytdlp.NET -Version 3.0.0

Or in your .csproj:

<PackageReference Include="Ytdlp.NET" Version="3.0.0" />

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Migration from v2 → v3

Key changes:

Feature | v2 | v3 -- | -- | -- Builder | Shared mutable YtdlpOptions | Immutable fluent YtdlpBuilder Thread-safety | None | Thread-safe by design with Interlocked guards Command execution | Single-use | Multi-instance with safe concurrent execution Events | Limited | Full progress, post-processing, and error events Probe | Minimal | Full stdout + stderr capture Options | Simple strings | Strongly-typed methods, full yt-dlp coverage

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YtdlpCommand Usage

var command = builder.Build();
command.OnProgressDownload += (s, e) =>
Console.WriteLine($"Progress: {e.Progress}%");
command.OnErrorMessage += (s, msg) =>
Console.WriteLine($"Error: {msg}");
await command.ExecuteAsync("https://youtube.com/watch?v=xyz");

Batch Example:

var urls = new[] { "url1", "url2" };
var results = await command.ExecuteBatchAsync(urls, maxConcurrency: 3);
foreach (var (url, error) in results)
{
Console.WriteLine($"{url} => {(error == null ? "Success" : error.Message)}");
}

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YtdlpProbe Usage

var probe = new YtdlpProbe(builder);
var info = await probe.GetInfoAsync("https://youtube.com/watch?v=xyz");
Console.WriteLine(info.Json);

• Returns metadata without downloading

• Captures stdout + stderr

• Thread-safe

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Examples

Single video download:

var builder = new YtdlpBuilder()
.WithOutputFolder("C:\Videos")
.WithFormat("best");
await builder.Build().ExecuteAsync("https://youtube.com/watch?v=abc123");

Audio extraction:

var builder = new YtdlpBuilder()
.WithOutputFolder("C:\Music")
.WithExtractAudio("mp3", 5);
await builder.Build().ExecuteAsync("https://youtube.com/watch?v=abc123");

Subtitles & Metadata:

var builder = new YtdlpBuilder()
.WriteVideoMetadata()
.WithDownloadSubtitles("en,ja", autoGenerated: true);
await builder.Build().ExecuteAsync("https://youtube.com/watch?v=abc123");

Batch with concurrency:

var urls = new[] { "url1", "url2", "url3" };
var command = builder.Build();
var results = await command.ExecuteBatchAsync(urls, maxConcurrency: 2);

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Best Practices & Tips

• Always use thread-safe builders (YtdlpBuilder) for multi-command scenarios

• Use events to track progress and errors instead of polling

• Use ExecuteBatchAsync for playlists or multiple downloads

• Avoid overwriting files by using NoFileOverwrites() and NoPostOverwrites()

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Error Handling

• All yt-dlp errors are propagated as YtdlpException

• Probe failures throw YtdlpException with stderr

• Cancellation uses OperationCanceledException

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This documentation is full exhaustive v3, ready for GitHub or NuGet.

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If you want, I can also generate a fully formatted README.md with clickable table of contents, badges, and live code blocks that you can drop directly into the Ytdlp.NET repo. This would make it production-ready.

Do you want me to do that next?