Potentially unhandled rejection | FFMPEG throws a unsupported format Error message

[AsP3X]

I've created a script to convert a mp4 in a webm file but i got an error message that is not related to the script it self because the script works fine on my ubuntu desktop pc with node js installed.

But the script throws an error message in my project and testing docker container.
The docker container is running on the latest version of ubuntu for docker.

DESKTOP
Nodejs version: 9.11.1
npm version: 6.2.0

DOCKER CONTAINER
Nodejs version 10.7.0 (Also tried on the same version gave me the same result)
npm version 6.2.0

Install command for all programs:
apt-get update && apt-get upgrade && apt-get install -y curl git nano htop && apt-get install -y gnupg2 && curl -sL https://deb.nodesource.com/setup_10.x | bash - && apt-get install -y nodejs && npm install npm -g

Script: Bitbucket / converter script

ERROR Message:
Potentially unhandled rejection [1] {"code":104,"msg":"The format \"$s\" is not supported by the version of ffmpeg webm"} (WARNING: non-Error used)

[AsP3X]

Project Tree:

Mainfolder /
- converter.js
- /src/
- - movie.mp4

[olaferlandsen]

same here, when using h264 + aac

[olaferlandsen]

Well, I change node-ffmpeg for node-fluent-ffmpeg

[ChrisCates]

Got the same issue.
Not sure how this repository is even usable.

[zahra-ove]

I'd have same problem, the reason for me was because FFMPEG was not installed on the server. for example for ubuntu server, the ffmpeg can install by sudo apt-get install ffmpeg.