Any ideas how to do that, preferably in a GUI program? I’m not good at CLI or scripts.
CONTEXT
I uploaded a video in Matroska mkv format (~1gb) to Internet Archive. IA added its own converted mp4 of much lower video quality (~500mb) & that’s the only video it will stream. The mkv only available by downloading.
As I’d prefer streaming availability, I used Handbrake (on Linux) to convert the mkv to mp4 myself, hoping to make a better quality mp4 that IA would stream.
Seems successful, plays fine locally, much better quality than IA’s mp4, & smaller file size (~800mb) than original mkv.
But I can’t upload it to IA as I get an error
There is a network problem
400 Bad Data
BadContent
Uploaded content is unacceptable.
Resource>video file has improper extension, try one of these: .mpv .mkv


CLI can be scary, but this is such a simple command to run. It should not be too intimidating.
If someone really needs a GUI, I believe VLC’s file conversion capability is basically just running an FFMPEG command like that in the background.