I have so far tried Pitivi and Shotcut, but neither of these seem to have this effect, by which one could speed up or slow down certain segments of a video. Also, Shotcut doesn't even work very well on my system and tends to crash at every opportunity. Unfortunately my bandwidth is limited, so I don't have much of a chance to try out many such video editors. If someone knows one such editor for Linux, I would find such answer very helpful.
2 Answers
You can change the speed of parts of a video with Kdenlive.
However you can only set a specific speed for a specific part so if you want to have it slowly increase or decrease the speed you need to cut the video multiple times (right click->cut) and change it to a different percentage for each fragment.
To change the speed right click the cut part of the video->Change speed. See here.
You can use Blender, it is packaged on the must known linux distributions.
The Video Editor includes:
- Live preview, luma waveform, chroma vectorscope and histogram displays.
- Audio mixing, syncing, scrubbing and waveform visualization.
- Up to 32 slots for adding video, images, audio, scenes, masks and effects.
- Speed control, adjustment layers, transitions, keyframes, filters and more!