How to deploy FFmpegBlazor to a production server?

You must configure your web server to include Cross-Origin-Embedder-Policy: require-corp and Cross-Origin-Opener-Policy: same-origin headers. The README provides examples for IIS and tools like dotnet serve, with a Netlify deployment sample available.

FFmpegBlazor vs server-side FFmpeg: which should I use?

FFmpegBlazor is best for client-side apps to reduce server load and enable offline processing, but server-side FFmpeg offers more power, reliability, and no browser limitations for complex or high-volume tasks.

Can FFmpegBlazor handle large video files in the browser?

Yes, but performance is constrained by browser memory and processing capabilities; the in-memory filesystem can manage files, but very large files might lead to slowdowns or crashes due to WebAssembly limits.

How to monitor conversion progress in FFmpegBlazor?

Use the Progress event handler from FFmpegFactory to receive real-time updates on the conversion ratio (0-1), as shown in the sample code where it logs progress and triggers actions upon completion.

Does FFmpegBlazor work with Blazor Server or only WebAssembly?

It only works with Blazor WebAssembly because it relies on client-side WebAssembly execution; server-side Blazor cannot run the FFmpeg.wasm binary directly in the browser.

What browsers support FFmpegBlazor?

Modern browsers that support WebAssembly and the required security policies, such as Chrome, Firefox, and Edge, but you should test compatibility as some environments may restrict headers like Cross-Origin-Embedder-Policy.

Open-Awesome

FFmpegBlazor

MITC#

A Blazor WebAssembly library that enables video and audio processing directly in the browser using FFmpeg compiled to WebAssembly.

Visit Website GitHub

148 stars22 forks0 contributors

What is FFmpegBlazor?

FFmpegBlazor is a .NET library that integrates ffmpeg.wasm into Blazor WebAssembly applications, enabling client-side video and audio processing. It allows developers to run FFmpeg commands directly in the browser for tasks like media conversion, recording, and streaming without requiring server-side processing. The library handles WebAssembly binary loading and provides a C# API to interact with FFmpeg's capabilities.

Target Audience

Blazor developers building web applications that require client-side media processing, such as video editors, audio converters, or streaming tools that need to operate entirely in the browser.

Value Proposition

Developers choose FFmpegBlazor because it brings the full power of FFmpeg to Blazor WebAssembly with minimal configuration, eliminating server dependencies for media processing. Its lazy loading and in-memory file handling optimize performance, making it ideal for offline-capable or privacy-focused applications.

Overview

FFmpeg on Web Assembly

Use Cases

Best For

Building client-side video conversion tools in Blazor applications
Creating browser-based audio editors without server processing
Developing offline-capable media processing web apps
Implementing in-browser video recording and streaming features
Reducing server load by handling media conversions client-side
Adding FFmpeg functionality to Blazor WebAssembly projects

Not Ideal For

Applications requiring fast initial load times with minimal bandwidth, as the 25MB FFmpeg WebAssembly binary can delay startup even with lazy loading.
Projects where server-side processing is preferred for reliability, complex workflows, or handling very large files without browser memory limits.
Teams unable to modify production server configurations to add required HTTP headers like Cross-Origin-Embedder-Policy and Cross-Origin-Opener-Policy.
High-performance media editing tools that need multi-threading for parallel tasks, since Blazor WebAssembly lacks full support until .NET 11.

Pros & Cons

Pros

Client-Side Processing

Executes FFmpeg commands entirely in the browser, eliminating server dependencies and reducing backend load for tasks like video conversion or audio recording.

Lazy Loading Support

Downloads the large FFmpeg WebAssembly binary (≈25MB) only when needed, optimizing initial page load times as highlighted in the README.

In-Memory File Operations

Uses emscripten's virtual filesystem to read and write media files in browser memory, enabling efficient manipulation without disk I/O overhead.

Real-Time Monitoring

Provides event handlers for progress and logging, allowing developers to give users feedback during conversions, as demonstrated in the sample code.

Cons

Deployment Complexity

Requires adding specific HTTP headers (Cross-Origin-Embedder-Policy and Cross-Origin-Opener-Policy) both locally and in production, a workaround admitted in the README that complicates setup.

Large Binary Size

The core FFmpeg WebAssembly library is approximately 25MB, which can significantly impact load times and data usage, even with lazy loading optimizations.

Multi-Threading Limitations

Blazor WebAssembly currently lacks multi-threading support, restricting performance for parallel media processing until .NET 11, as noted in the README.

Frequently Asked Questions

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