Add option to remove audio channel from video file

[urbantrout]

ffmpeg offers a solution to remove all audio channels via -an (https://ffmpeg.org/ffmpeg.html#Audio-Options)

Useful if editors upload videos with audio which are only being used as background videos (autoplay, muted)

[khalwat]

Maybe the best idea is just have to have some kind of generic "additional flags" you can pass in?

[urbantrout]

Good idea! Will send a PR when I find time…