nwjs-ffmpeg-prebuilt VS ffmpeg.wasm

You need libffmpeg. You can download a prebuilt one from here. Put libffmpeg.so file to lib_extra directory at Opera's installation directory (probably /usr/lib64/opera).

How to Install libffmpeg (for proprietary h.264 and aac support) for Opera for Linux_x64 Goto the URL opera://about and look at the "Browser identification" (User-Agent) string to see what major version of Chromium Opera is using (79, 80, 81, 82 etc.). Also, take note of the "install" path. You'll need that later. Goto https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases/ and download the latest -linux-x64.zip that's built with the same major version of Chromium that your Opera is. For example, if your Opera is built with Chromium 79, goto https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases/tag/0.43.6 and download 0.43.6-linux-x64.zip. Or, goto https://packages.ubuntu.com/search?keywords=chromium-codecs-ffmpeg-extra and click on the link to the distro that has "chromium-codecs-ffmpeg-extra" for the version of Chromium you need. Then, on the page for the distro, click the "amd64" link to goto the download page. On the download page, you can download the deb file and then extract it to get libffmpeg.so out of it. For example, if you need libffmpeg.so for Chromium 81, goto https://packages.ubuntu.com/focal-updates/amd64/chromium-codecs-ffmpeg-extra/download and download the the deb file. (in this case though, ignore that and use the libffmpeg.so in http://security.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/chromium-codecs-ffmpeg-extra\_83.0.4103.61-0ubuntu0.18.04.1\_amd64.deb that's from https://packages.ubuntu.com/bionic/chromium-ffmpeg-extra even though it says it's for Chromium 83) If nothing works, try a libffmpeg.so for the next version of Chromium and so on. Once you have the zip/deb file, extract it to get libffmpeg.so. Then, create the folder lib_extra in Opera's install folder that you took note of in opera://about earlier and put libffmpeg.so in the lib_extra folder. The path to libffmpeg.so should then be opera_install_folder/lib_extra/libffmpeg.so. On Linux Mint, that'd be /usr/lib/x86_64-linux-gnu/opera/lib_extra/libffmpeg.so. On Arch Linux, it might be /usr/lib64/opera/lib_extra/libffmpeg.so. Again, goto the URL opera://about in Opera and look at the "install" path.

There's already ffmpeg wasm. I've used it in projects. Works great.

https://github.com/ffmpegwasm/ffmpeg.wasm

There's a low-hanging fruit that I think would make ffmpeg more helpful for regular people.

There's a million terrible websites that offer file conversion services. They're ad-ridden, with god-knows-what privacy/security postures. There's little reason for users to need to upload their files to a third-party when they can do it locally. But getting them to download fiddly technical software is tough - and they're right to mistrust it.

So, there's a WASM version of ffmpeg, already working and hosted at Netlify [1]. It downloads the WASM bundle to your browser and you can run conversions/transformations as you wish, in your browser. Sandboxed and pretty performant too!

If this tool a) was updated regularly b) had a nicer, non-CLI UI for everyday users and c) was available at an easily-Googlable domain name - it would solve all the problems I mentioned above.

[1]: https://ffmpegwasm.netlify.app/

As their github page says, based on https://ffmpegwasm.netlify.app ...

I'm guessing no one did GPU-optimizations? I saw a web app (not an ffmpeg transpilation) that went clever and used WebGL so it can access the GPU and use its parallel processing capabilities...

ffmpeg.wasm: The engine making all these happen. However, I’m a bit concerned about its current situation. The repo has not been updated for more than six months now, and that’s not a healthy sign for an open-source project. Clearly I was reading the commits wrong. The author mentioned “speed up x264 with SIMD intrinsics” in their roadmap (https://github.com/ffmpegwasm/ffmpeg.wasm/discussions/415), which, if landed, could make such on-device video editors much more competitive.

I use https://github.com/ffmpegwasm/ffmpeg.wasm and I want my FFMPEG commands to be hidden from others.

Possibly using this? https://github.com/ffmpegwasm/ffmpeg.wasm

You could try using something like ffmpeg wasm which is a way of using ffmpeg client side in browser. Unfortunately WebAssembly only supports files less than 2 gigabytes, which is a problem for videos. And I don't know if ffmpeg wasm contains ffprobe, so you might have to find another project or try to compile ffprobe to wasm yourself. This stuff is out of my wheelhouse so I can't offer much help.