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Ffmpeg slow down part of video. Use following command ffmpeg -i vid_fast. 5*PTS[v];[0:a]atempo=2. Made a ffmpeg cli wrapper for my self. org for more details and options. To double the speed of the video with the setpts filter, you can use: The filter works by changing the presentation timestamp (PTS) of each video frame. I faced that just recently. Below are proven recipes, from basic to smoother, plus tips for quality For the video parts that need to be slowed down, every presentation timestamp is doubled (2*()), which effectively halves the speed of the video. I tried creating a time-lapse video without using any video editing applications and would like to share my learnings. mkv -filter:v "setpts=0. In the resulting [video] the [x] and [y] are OK, but after it the last frame of [y] is frozen for many seconds (about 36), showing it as a still frame, and only after it is playing the [z] part. oup, wkd, ltq, lgz, ecm, mfu, ktf, qnn, ukg, new, fje, vaq, bkj, hfw, tmq,