The sun rose, the cats were watching the birds on the windowsill and at first I just wanted to take a cute picture of them sitting soo close, but then I had another inspiration ..
0. Prepared the logo from some internetsearch; stripped of colors, converted to 3-color-GIF with transparency: all done by GIMP and some magic.
1. converted the video to GIF with greyscaling and resizing
2. merged the two pictures while optimizing the layers and applying some contrast
ffmpeg -i VID_20160420_061216.mp4 -vf scale=320:180 -strict -2 -vf format=gray video_gray.mp4 && \
ffmpeg -i video_gray.mp4 -t 3 -b:v 1024k -vf scale="320x180" gray320.gif && \
convert gray320.gif -contrast -coalesce -gravity SouthWest -draw 'image Over 0,0 0,0 "leben2.gif"' -layers Optimize combined320.gif
BTW: sometimes empty phrase-error messages spark my fury … “convert.im6: non-conforming drawing primitive definition `image’ @ error/draw.c/DrawImage/3158.
” … and what does this tell me now?!?
But at least I am not the first one who understood nothing! Thank you.