This is neat.

While only tangentially related, I dove into a rabbit hole not long ago trying to find the best ffmpeg GUI (that doesn't require Wine or a VM to run on macOS) and found some good stuff. Handbrake [1] is great and uses ffmpeg as part of its backend, but it gets somewhat limited when you start requiring more advanced things like vf chains, scripting/automation, obscure/legacy codec support, or specific hardware acceleration needs. I wanted to find something that gets (close to) as densely packed with features as ffmpeg from the command line, and here's what I found. I'm not going to list all their features and pros/cons, but just let others know about some of these as a starting point.

I'm not affiliated with any of these programs (Handbrake and ffmpeg included) in any way, I just want to point others in the right direction if they come across this comment.

StaxRip [2] - One of the most popular and complete options. Seems like one of the the go-tos on the VideoHelp [3] forums for video editing GUIs. Supports AviSynth+ and VapourSynth scripts among other advanced features.

clever FFmpeg-GUI [4] - Another VideoHelp go-to. I'm not 100% sure if this supports AviSynth/VapourSynth, but it's pretty damn feature-complete as far as ffmpeg goes.

Shutter Encoder [5] - Probably has the most intuitive UI of the bunch, it feels much closer to a Premiere Pro/Davinci Resolve type program rather than an ffmpeg wrapper, albeit those applications are much more robust for different tasks.

Hybrid [6] - My favorite out of these, purely because it was easy enough to get running on macOS and didn't sacrifice many ffmpeg features. Also supports AviSynth/VapourSynth.

Honestly, probably didn't even need to comment this; I wish I had more knowledge about these to share in-depth. If you're serious about video encoding, your best bet is to start learning how to use ffmpeg from the command line anyways, then maybe add AviSynth+/VapourSynth into the mix as you see fit, though those are a good deal more advanced than even ffmpeg. Just my two cents.

[1] https://handbrake.fr/

[2] https://github.com/staxrip/staxrip

[3] https://www.videohelp.com/software/sections/video-encoders-h...

[4] https://www.videohelp.com/software/clever-FFmpeg-GUI

[5] https://www.shutterencoder.com/

[6] https://www.videohelp.com/software/Hybrid