Recently I wanted to cut a video (just export few seconds of a long video).

When everything still was AVI it was easy for me and I used VirtualDub. There I could decide if I just do a keyframe cut without having to encode it again, or a frame cut with having to encode this.

Nowadays having MKV, MP4 etc. I tried Lossless Cut which just gave me a black video. Open Shots Video Editor which is too complicated for this task and where I struggle to maintain the aspect ratio of the original video. Handbrake is a bit better, but also offers too many options for that purpose.

So I ended up using Online Video Cutter. But I wonder that there isn't any open source that just works as easily as that.