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In iMovie you can change the speed of a clip by selecting it in the timeline and then clicking on the icon that looks like a speedometer: Then click on the "Speed:" popup menu and choose "Fast" or "Custom". The "Custom" setting lets you choose how much faster to make it (like 200%, or 50%).


You can use ffmpeg, a command line program, to double the video speed: ffmpeg -i input.mp4 -vf setpts=0.5*PTS output.mp4


I read somewhere else that people switched container .mp4 to .mkv and now it works with Windows Movie Player. But I do not why .mp4 does not work anymore with my Windows Movie Player. And iMovie can not read or open .mkv - so I have still this problem. With 'switched' I mean recoded it - I used Handbrake for it.


The variable frame rate is all that stands out. Save future videos with constant frame rate. As for these ones, transcode using ffmpeg* to CFR MP4s: ffmpeg -i currentvideo.mp4 -c:a copy -crf 16 -r 30 -fflags +genpts newvideo.mp4 *Get the 32-bit static build.


This answer in the Graphic Design forum explains how to make an image background transparent in either of two ways. If you have an animation you have captured (perhaps by screen-casting your drawing session into a series of images), you can use an image editing tool that can do batch processing, such as The GIMP, to create the transparency type most ...

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