I'm absolutely enthralled if you're planning to add the facility to your LosslessCut. Alas, it's Windows-only, not open-source and non-free (but relatively cheap) but it's a good benchmark to follow.
He never updated it for HD (H.264 and etc) and, in the end, I shifted to VideoReDo which handles top-and-tailing and advert removal very efficiently and reliably using "smart cut" techniques and FFmpeg as the internal engine. I more or less grew up with SvenOver's DVBcut which did implement "keyhole surgery" editing. Tries to copy timebase from source to destination.It tries to auto-detect bitrate from input stream, however if it fails, then it will calculate bitrate from the whole file's size/duration (may be wrong).Only scans up to 60 seconds to find a keyframe.You can still probably do multi-passes and then recreate a file with all the streams. All other video streams have to be disabled (in the tracks panel). Only supports cutting a single video stream.I've had success with some h264 files, and only a few h265 files seem to work.This experimental feature will re-encode the part of the video from the cutpoint until the next keyframe in order to attempt to make a 100% accurate cut while losslessly copying the rest of the segment. Have now made an initial implementation of this. Might be able to use avcut for h264 although it is experimental. In the future we could implement a smart cut that re-encodes (lossy) the part between the cutpoint and next keyframe.So ffmpeg will choose the nearest keyframe, which will not be the exact time you requested. We cannot cut between keyframes, it's a technical limitation of modern video codecs.
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