With ffmpeg library, you can work with ffmpeg by using command-line It base this: https://github.com/bravobit/FFmpeg-Android You can convert any media to other format, edit video and audio,..... Because it use command to control ffmpeg so you should test on windows or mac firsts, if it works...
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. I'm asking in the example above.
. -vcodec libx264 works fine.
. -vcodec libopenh264 does not run