Show HN: FFmpeg WebCLI – Full FFmpeg in Browser, Offline PWA, No Uploads(WASM)

 (github.com)

49 points | by tejaswigowda 2 hours ago

10 comments

  • senshi001 1 hour ago
    Just a thought - is the text “Click to upload” with a cloud icon perhaps a bit misleading?

    If it’s fully client side, then you are just opening a file in essence - no clouds in sight!

    [-]
    • shevy-java 13 minutes ago
      I guess UI-wise some changes wouldn't be bad, but I am just glad it works. I am currently converting an ancient .mpg into a .mp4; I could do so via ffmpeg from the commandline, but I always forget which options to use, so a GUI kind of frees brain space here.
    • pooploop64 1 hour ago
      I agree something like a folder or file icon would be more accurate.
  • ale42 1 hour ago
    Nice interface at a first glance, for sure can be useful for users who would find using the actual thing too cumbersome. How does performance compare to the native app? Is any form of hardware decoding/encoding like h264_nvenc available? (I guess not?)
    [-]
    • dtf 1 hour ago
      I would imagine the only way to use NVENC directly from a browser would be via WebCodecs.
  • jamal-kumar 1 hour ago
    Any chance those AVX-512 optimizations they released a while ago work within this? [1]

    [1] https://www.phoronix.com/news/FFmpeg-July-2025-AVX-512

    [-]
    • dtf 1 hour ago
      I think WASM SIMD is only 128-bit wide.
    • adzm 1 hour ago
      Note those only apply to scene_sad which is used for scene change detection and freeze detection and a few other things like mpdecimate -- it's a very specific use case
  • majorchord 25 minutes ago
    vibe-coded, and the github repo does not even contain the sources, just a single 'server.js' that is only for the documentation
  • zuzululu 27 minutes ago
    this is ffmpeg running inside the browser am I correct? did not know this was possible. wonder what else we can run via webassembly
  • shevy-java 14 minutes ago
    Interesting idea - must have been a lot of work to add all those features. I just tried it and it works locally too, which is pretty epic.
  • luispa 28 minutes ago
    This is dope. Made a PR.
  • westurner 1 hour ago
    From https://news.ycombinator.com/item?id=44717303 :

    > Objective metrics and tools for video encoding and source signal quality: netflix/vmaf, easyVmaf, psy-ex/metrics, ffmpeg-quality-metrics,

    netflix/vmaf: https://GitHub.com/netflix/vmwaf

    gdavila/easyVmaf: https://github.com/gdavila/easyVmaf

    psy-ex/metrics: https://github.com/psy-ex/metrics/

    slhck/ffmpeg-quality-metrics: Calculate quality metrics with FFmpeg (SSIM, PSNR, VMAF, VIF) https://github.com/slhck/ffmpeg-quality-metrics

    Something like this would be great too:

    The Ardour Manual > Loudness Analyzer and Normalizer: https://manual.ardour.org/mixing/basic-mixing/loudness-analy...

  • thomas_viaelo 34 minutes ago
    [dead]
  • aleksandre_dev 1 hour ago
    [flagged]