{
  "id": 13090989,
  "title": "How We Built an In-Browser 0.4s Lossless Video Trimmer with WebAssembly (and Zero Backend Servers)",
  "url": "https://urgent.news/2026/10/09/how-we-built-an-in-browser-0-4s-lossless-video-trimmer-with",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-10-09T10:26:50.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/khaithisran/how-we-built-an-in-browser-04s-lossless-video-trimmer-with-webassembly-and-zero-backend-servers-31jg"
  },
  "original_language": "en",
  "account": "Online video editors typically send video files to the cloud for basic editing tasks, adding unnecessary data transfer and compromising privacy. SolveMyMedia offers a solution, allowing lossless trimming in the browser using WebAssembly. The architecture relies on stream copying via WebAssembly, bypassing CPU-intensive re-encoding and achieving instantaneous 0.4-second trimming. To trim video in memory, the API uses ffmpeg.js to load the video file, extract the H.264/AAC bitstream directly between container boundaries, and create a new MP4 file with the trimmed segment. Performance benchmarks show that SolveMyMedia outperforms AWS Lambda + S3 pipelines, with upload, processing, and server costs significantly reduced, while maintaining data privacy by avoiding third-party cloud storage.",
  "summary": "Modern web video tools have a glaring architectural flaw: we are still transferring hundreds of megabytes over the public internet to perform basic byte manipulation. If you want to trim 3 seconds off an MP4 video clip today, the typical \"online video editor\" forces you through a cloud queue and slaps on a watermark. Slicing an MP4 file doesn't require cloud server farms—it literally just…",
  "key_points": [
    "SolveMyMedia enables lossless video trimming in browser without cloud processing",
    "WebAssembly stream copying achieves 0.4-second trimming with no CPU re-encoding",
    "Performance beats AWS Lambda + S3, reducing upload, processing, and server costs"
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}