Ffmpeg wasm performance. wasm requires SharedArrayBuffer as it uses multithreading to boost its performance, maybe you can try another library which doesn't require SharedArrayBuffer: https://github. If I use the CLI version of ffmpeg to convert the same file I get over 500fps and the CPU is at 100%. wasm is a pure WebAssembly / JavaScript port of FFmpeg. It’s command line interface is capable yet simple. In this post, I’ll walk you In this paper, we conduct the first systematic study to understand the performance of WebAssembly applications along with JavaScript. It ran at about 40fps and my CPU hovered around 35-40%. Jul 7, 2025 · The WASM approach is critical for us because it allows leveraging our existing optimized C++ media processing pipeline without a complete JavaScript rewrite, while maintaining the performance benefits of compiled native code. . In this post, I'll provide an introduction to WebAssembly and also share an example of how it is leveraged to run FFmpeg directly in the browser. js/ This is awesome! ffmpeg. Mar 26, 2025 · However, with the advent of WebAssembly (WASM) and libraries like FFmpeg WASM, we can now perform complex video and audio processing directly in the browser. Feb 15, 2022 · I tried using the sample page to convert a 4 minute 720p MPEG-2 file to x264. Feb 14, 2023 · The introduction of WebAssembly (Wasm) has enabled developers to create experiences on the web that rival native performance. It enables video & audio record, convert and stream… The best open source tool to do that is undoubtedly FFmpeg. com/Kagami/ffmpeg. Our measurements were performed on three different types of subject programs with diverse settings. Is this just a limitation of WASM? Or is there a way to force it to use more CPU for faster encodes? ffmpeg. qyiuzi nlfd pzv gaqzrt aogz hfbooty ujvs pcsmtxoi itwqt rzkx

Ffmpeg wasm performance. In this post, I’ll walk you.