The output is saved in the same location without prompting you to choose a file name, so make sure you isolate the files you want to cut in a separate folder, just to find them easier.
Unfortunately, the input selection window does not filter the files to only show the compatible ones so you will just have to find the file yourself. Once you do that, you can start loading a video in LosslessCut, either using drag and drop or by selecting its location manually. You are prompted to select the location of the ffmpeg executable file upon the first launch of the application. LosslessCut does not need setup, but it cannot work without FFmpeg, as it relies on the capabilities of the popular video processing framework to cut parts of the input clip. There are many simple video cutters or trimmers out there that can perform this task just as efficiently, and LosslessCut is one of them.
Removing certain parts of a video does not necessarily require a professional tool.
