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http://video.stackexchange.com/questions/19867/how-to-fade-in-out-a-video-audio-clip-with-unknown-duration
  http://www.bogotobogo.com/FFMpeg/ffmpeg_fade_in_fade_out_transitions_effects_filters_two_slides.php
    
    http://www.bogotobogo.com/FFMpeg/ffmpeg_fade_in_fade_out_transitions_effects_filters.php
      http://superuser.com/questions/833232/create-video-with-5-images-with-fadein-out-effect-in-ffmpeg
        http://hamelot.io/visualization/using-ffmpeg-to-convert-a-set-of-images-into-a-video/
          https://en.wikibooks.org/wiki/FFMPEG_An_Intermediate_Guide/image_sequence