>>42951>>42951>all I need is to cut one second from the beginning and render the result as MP4.FFMpeg's command-line can do this.
But beware, because it's as if the designers of FFMpeg read the parable of the Golem and thought "what a helpful golem! He dug a really big hole, just like he was asked!".
FFMpeg will do exactly what you tell it to. Not what's sensible, reasonable, what's standards-compliant, or what you probably meant, but exactly. what. you. told. it. to.