For weekend project, I wrote a VidCutter app. The whole idea was to have kind-of-videoplayer that'll let me watch the video file and mark two points (start and end) and then create a new video file with only selected fragment of original file.
Technically you can use any video editing tool but I'm not aware of single one that can do this without performing re-encode, which is waste of time and electricity.
My solution - written in Lazarus-FPC - uses FFMpeg with copy "codec" so it's near instant (or "as slow as your storage medium") and DirectShow for video preview.
And use case? I keep archival recordings of interesting moments from my car's dash cam and they're in 3 minute segments, each takes around 650MB (it's 1920x1080 @ 30fps at 28Mbits/s bitrate) so my collection quickly grew to over 80 gigabytes of videos. And actually interesting is probably 1/5 of that, if not less. VidCutter will help me quickly throw away unneeded segments and reclaim storage.
Now the question is, is there a "market" for such tool? Is it worth sharing (even if it's only for Windows or anything that can imitate DirectShow)?

now migrated from an old 






