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

this might be an extremely stupid question, but is this just a demo project of https://github.com/ffmpegwasm/ffmpeg.wasm? or is this bringing forth some other utility that im not seeing?

In 2016 I was working for an organization that wanted a video streaming web app, but could not tolerate any latency. In the past, we solved this with an NAPI extension in Firefox. They removed this for good security reasons, but it left our users without an option. They would have to move to an electron app. Distributing this app and updating it across 1000s of terminals worldwide was not something we were set up to do. I hacked together something like this and could not believe how well it worked. The initial POC is here: https://github.com/colek42/streamingDemo.

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!

vibe-coded, and the github repo does not even contain the sources, just a single 'server.js' that is only for the documentation

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?)

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

I find it fascinating that we keep trying to build things that already exist, but on top of another app (web browser). I mean, it's cool to see, and it will have its use-cases, but I wonder where we'd be if we didn't have to do this.

I love this, be interesting if this could make an in-browser video editor

FFmpeg is so useful for TTS

this is ffmpeg running inside the browser am I correct? did not know this was possible. wonder what else we can run via webassembly

This is dope. Made a PR.

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.

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...

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