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Tha final list of the candidates looked like this: They were several libraries allowing some video manipulations but I did not know much about their functionality at that point. After lots of googling and reviewing possible options and existing similar apps and examples, I found only a few tools which seemed reasonable at that point. There was no simple solution and I had to solve the task and besides do it quickly. But in some time after starting the development, I realized Android OS did not (and does not) have instruments for that kind of manipulations. I was really excited when it turned out my new Android project was related to the video processing because the task was very interesting and I thought I knew some possible solutions.
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