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FFmpeg is a free software project that produces libraries and programs for handling multimedia data. The most notable parts of FFmpeg are libavcodec, an audio/video codec library used by several other projects, libavformat, an audio/video container mux and demux library, and the ffmpeg command line program for transcoding multimedia files.

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convert horizontal side by side to vertically stacked 3D video

I have seen this and this post explaining how to crop and stack videos using ffmpeg. … Note: you need a recent version of ffmpeg for the vstack filter - version 2.6 which is installed with Fedora 22 is too old. Version 2.8.3 has vstack available. …
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