pixelcommand

#pixelate
# youtube video https://youtu.be/yws7sCaUE40
#------------------------------------------------------
#two steps:

ffmpeg -i input.MOV -vf "scale='iw/10:-1'" scaled.MOV
ffmpeg -i scaled.MOV -vf "scale='iw*10:-1':flags=neighbor" pixeled.MOV
#-------------------------------------------------------
#https://stackoverflow.com/questions/9093549/ffmpeg-how-to-add-pixellate-effect

num=5
input=input.MOV
output=output.MOV

ffmpeg -i $input -filter_complex \
"[0:v] scale='iw/$num:-1', scale='iw*$num:-1:flags=neighbor'" $output

#------------------------------------------------------
# to avoid errors, if your inputs have no sound remove the "-map 0:a" option
 
ffmpeg -i pixelated_input.MOV -i mask.png -i input.MOV -filter_complex "\
[0:v][1:v] alphamerge [tmp1];\
[2:v][tmp1] overlay [v]"\
  -map "[v]" -map 0:a outpix.mp4
#------------------------------------------------
# to avoid errors: make sure the division equation results in a whole number without remainders.

ffmpeg -i input.MOV -i mask.png -filter_complex \
"[0:v]split=2[out0][out1];\
[out0]scale='iw/10:-1'\
,scale='iw*10:-1:flags=neighbor'[tmp1];\
[tmp1][1:v] alphamerge [tmp2];\
[out1][tmp2] overlay [v]"\
 -map "[v]" -map 0:a outpxs.mp4

#mask page:
# https://superuser.com/questions/901099/ffmpeg-apply-blur-over-face

#alphamerge page:
# https://hhsprings.bitbucket.io/docs/programming/examples/ffmpeg/manipulating_video_colors/alphamerge_alphaextract_more_.html

#tutorial on filtergraphs:
# https://medium.com/craftsmenltd/ffmpeg-basic-filter-graphs-74f287dc104e