You can drag the edges of the yellow "selection" with the mouse, no need to enter the timestamps manually.
As for frame accuracy, I'm indeed well aware of the issue. I checked Lossless Cut source now and found useful links about how to implement keyframe visualization with ffmpeg, I might give that a try. There's also smart encoding of just beginning to first keyframe, but not sure how doable that is through the ffmpeg binary.
1. Play the video roughly until the point where I want the cut to be set
2. Slow down playback, go some frames forward and backward, even play video backwards and then set the cut by clicking a button
Also, visualizing the audio waveform can be helpful for finding a cut :D
- loop the trimmed part to see if an animation looks good when looped before export
- playback speed adjustment (play in slow-motion to check every keyframe while in motion)
- show duration of trimmed clip
- zoom into timeline for long videos where only a short clip is extracted
- jump to next/prev scene transition (e.g. i-frames with huge delta)
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