Cut out the breaths and pauses between words so speech runs on quickly without gaps. Because the cuts happen inside the same framing, you get jump cuts and the video speeds up.
Talking-head YouTube, lectures and explainer videos, short-form narration. If you cut even the emotional pauses, the speech sounds out of breath, so keep the ones that matter.
If narration you generated or speech you recorded has long pauses, find the start and end times of the silent sections with silencedetect. Feed the same sections to both select (picture) and aselect (sound) when you cut, or the mouth and the sound will drift apart. In Premiere's text-based editing, choose Pauses in the Transcript panel filter and delete them all at once with Delete all. If a cut spot looks jumpy, cover it with a punch-in or B-roll.
Editor instruction: on this talking-head clip, find every pause longer than 0.4 seconds below -35 dB, remove each one from both picture and sound at the same points, and keep a few frames of breath before each new sentence so speech stays natural. Detect: ffmpeg -i talk.mp4 -af silencedetect=noise=-35dB:d=0.4 -f null - ; then cut the reported ranges: ffmpeg -i talk.mp4 -vf "select='not(between(t,1.2,1.9)+between(t,4.0,4.6))',setpts=N/FRAME_RATE/TB" -af "aselect='not(between(t,1.2,1.9)+between(t,4.0,4.6))',asetpts=N/SR/TB" cut.mp4
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