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I dont want to use player like vlc to speedup the playback. I want to actually speedup playback in the original file.

Its like I want video to be played 2 times faster.

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mencoder has a -speed option you can use, e.g. -speed 2 to double the speed. It's described in the man page. Example:

mencoder -speed 2 -o output.avi -ovc lavc input.avi
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slowmoVideo is able to speed up and slow down video

slowmoVideo is an OpenSource program that creates slow-motion videos from your footage.

But it does not simply make your videos play at 0.01× speed. You can smoothly slow down and speed up your footage, optionally with motion blur.

How does slow motion work? slowmoVideo tries to find out where pixels move in the video (this information is called Optical Flow), and then uses this information to calculate the additional frames.

First download and install the program. When it is loaded go to File > New and select your video file.

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With your video loaded draw you curves (by clicking on an empty area) to describe how the video should speed up and slow down.

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When you have finished go to File > Render (Ctrl + R) and choose a directory to save your video

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Kdenlive is a video editor for KDE that also can do it and even has a GUI.

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