How to use it
- Drop your clip.
- Drag the two handles, or type times into In and Out. Arrow keys nudge a handle by a tenth of a second.
- Pick Fast unless the first frame has to be exact.
- Save it. MKV recordings come out as MP4 when their codecs allow it.
Fast or Exact
Video files are built from keyframes with small changes stored between them. Fast cuts on a keyframe and copies everything after it, so it takes seconds and the picture doesn't change. Recordings usually have one every few seconds, so the cut can start that much early. Exact decodes and re-encodes the clip at about the same bitrate as the source, so the first frame is the one you picked, at a small cost in time and quality.
Questions
Can I turn an OBS MKV into an MP4 here?
Yes. Drop it in, leave the handles at the ends and use Fast. The video is copied into an MP4 with no re-encoding.
Why does my Fast cut start early?
It has to start on a keyframe. Use Exact when the first frame matters.
Is there a watermark?
No. Not on free, not on Pro.