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effects suggest f_kaleidoscope

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If there was a call for suggested ffmpeg effects, then here's one I have been having fun with. How practical or desirable it may be to include among the Cinelerra effects, I don't know. It is fast to run as an ffmpeg script from the command line.

ffmpeg -i $1 -i $1 -i $1 -i $1 -filter_complex "[1:v]hflip[a]; \
[2:v]vflip[b]; \
[3:v]"hflip,vflip"[c]; \
[0:v][a]hstack=inputs=2[top]; \
[b][c]hstack=inputs=2[bottom]; \
[top][bottom]vstack=inputs=2[out]" -s 1280x720 -map "[out]" $2


ffmpeg -i $1 -i $1 -i $1 -i $1 -filter_complex "[1:v]hflip[a]; \
[2:v]vflip[b]; \
[3:v]"hflip,vflip"[c]; \
[a][0:v]hstack=inputs=2[top]; \
[c][b]hstack=inputs=2[bottom]; \
[bottom][top]vstack=inputs=2[out]" -s 1280x720 -map "[out]" $2

The top script flips mirrors and stacks an input video to form a 2 x 2 mirror type kaleidoscope. The second script flips and mirrors 2 x 2 but inside out. If this was to become an F_kaleidoscope effect, then there may be an option switch needed between those two inverse results. 

I've brute force scaled at the output, it would clearly be better to divide by 2 at the input/inputs. I've a similar pair of scripts to allow 4 different input videos to be thrown together. Just a suggestion, its very silly, I hope you find it of interest.

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@adam4567

I like it ! -- the second one is my favorite.

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