I've been using LosslessCut for a few years now. It's really easy and smooth. It does exactly what I want and what the name says, and I couldn't ask for more.
It's a slightly different use case, I default to Losslesscut and switch to Shotcut when I need a vfilter or if I'm just generally willing to concede to making a lossy cut.
Shotcut is way more flexible but I can make a quick clip in Losslesscut with probably 1/3 the number of user effort/inputs. Let alone trying to remember every ffmpeg parameter under the sun just to get consistent usable output
It is a good tool, but for me it only trims from the keyframes. To trim precisely, it has to re-encode, which, unfortunately, does not work on my machine for some reason. So, I just stick to ffmpeg cli.
I suppose that makes sense given that information is encoded as a series of key frames interspersed by 'I-frames" that simply encode the delta to the previous key-frame when using most compressed video algorithms. So cutting in-between key-frames doesn't really make sense since the I-frame would no longer have anything to reference it's delta to.
This has always bothered me, I suspect it's the same underlying reason most video players can't do reverse frame-by-frame. But Quicktime allowed it twenty years ago, so it's possible. I suppose you'd have to actually decode the entire keyframe interval and use the resulting frames as new "baked-in" keyframes so to say. I suppose that's more or less what djv and other frame checkers do under the hood. But I don't know what I'm talking about so...
That's what I've always assumed it does since back when quicktime player barely even ran on my PC yet for timeline operations it was significantly more responsive than WMP/MPC.
For Losslesscut I just get around this by encoding my input from source using keyint=n:scenecut=0 in ffmpeg where n is a manually set keyframe interval.
So e.g. if my expected cut occurs on a frame that occurs at t+10 seconds of footage, n can be the same as the fps and then there'll always be a keyframe exactly at timestamp 00:00:01, 00:00:02 and so on. I can then open it in losslesscut and easily snap to the frame I want and make the cut losslessly.
Yeah the first encode generally means a lossy transcode by the time I get to my final video but being realistic that'd be a part of my workflow either way and this way it's less
