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I don't know about ffslice, but you can get frame-perfect slicing with minimal reencoding via LosslessCut's experimental "smart cut" feature[2] or Smart Media Cutter's[3] smartcut[4].

Excellent video snipping resources. I love HN for this.

For some reason, when ffmpeg reencodes from 23.97fps h264 to the same fps and codec, the result looks choppy, like the shutter speed was halved or something. The smart lossless encoding you mentioned helps a lot here.

Yes, the tool snaps to I-frames when slicing. The `-c copy` flag ensures no re-encoding, and inherently limits cuts to keyframes.

TBH it's an unfortunate side-effect sometimes as you cannot cut video or audio exactly where you want.

>without re-encoding

What do you think?