[jitter] cropping and compositing

Hello, 

I'm trying to crop 3 images and composite 1 image with these 3 
and I don't want my image squeezed. 

I used scissors and glue and it's almost what I want. But one thing is that the control of the split point is quite limited. 

I looked up the topics here, and found a patch, which is using jit.gl.videoplane. So I copied and pasted, tried to figure it out. 
but the patch included what I don't need, so complicated for me yet. 

Could you help me please? Here is what I got so far. 


#P user jit.pwindow 816 231 162 92 0 1 0 0 1 0;
#P user jit.pwindow 463 219 162 92 0 1 0 0 1 0;
#P user jit.pwindow 166 226 162 92 0 1 0 0 1 0;
#P window setfont "Sans Serif" 9.;
#P window linecount 2;
#P message 859 620 80 196617 \; max hidecursor;
#P message 756 619 85 196617 \; max showcursor;
#P window setfont "Fixedwidth Serif" 10.;
#P window linecount 1;
#P newex 755 561 212 1441802 sel 0 1;
#P window linecount 2;
#P message 756 587 98 1441802 \; max showmenubar;
#P message 857 587 98 1441802 \; max hidemenubar;
#P window linecount 1;
#P message 643 626 83 1441802 fullscreen \$1;
#P toggle 649 599 15 0;
#P newex 649 577 62 1441802 select 32;
#P newex 649 556 40 1441802 key;
#P window setfont "Sans Serif" 9.;
#P newex 414 574 162 196617 jit.window tricom @size 320 180;
#B color 5;
#P comment 748 108 100 196617 movie 2;
#P message 814 158 27 196617 stop;
#P message 777 159 31 196617 start;
#P toggle 723 107 15 0;
#P window setfont "Fixedwidth Serif" 10.;
#P newex 723 129 53 1441802 metro 50;
#P newex 723 188 130 1441802 jit.qt.movie 640 480;
#P message 736 159 34 1441802 read;
#P window setfont "Sans Serif" 9.;
#P message 217 166 27 196617 stop;
#P message 183 166 31 196617 start;
#P window setfont "Fixedwidth Serif" 10.;
#P newex 409 327 222 1441802 jit.scissors @rows 1 @columns 16;
#B color 5;
#P window setfont "Sans Serif" 9.;
#P newex 419 165 195 196617 jit.qt.grab 640 480 @vmode 2 @unique 1;
#P message 538 136 44 196617 settings;
#P comment 441 112 105 196617 Use live camera input;
#P message 503 135 31 196617 close;
#P message 472 135 28 196617 open;
#P toggle 419 111 15 0;
#P newex 419 135 52 196617 metro 50;
#P window setfont "Fixedwidth Serif" 10.;
#P newex 713 335 222 1441802 jit.scissors @rows 1 @columns 16;
#B color 5;
#P newex 126 330 222 1441802 jit.scissors @rows 1 @columns 16;
#B color 5;
#P user jit.pwindow 398 452 162 92 0 1 0 0 1 0;
#P newex 390 379 209 1441802 jit.glue @rows 1 @columns 16;
#B color 5;
#P toggle 129 114 15 0;
#P newex 129 136 53 1441802 metro 50;
#P newex 129 195 130 1441802 jit.qt.movie 640 480;
#P message 142 166 34 1441802 read;
#P window setfont "Sans Serif" 9.;
#P comment 157 115 100 196617 movie 1;
#P connect 33 1 35 0;
#P connect 33 1 31 0;
#P connect 20 0 8 0;
#P connect 20 0 38 0;
#P connect 33 0 34 0;
#P connect 33 0 32 0;
#P fasten 29 0 30 0 654 617 645 617 645 595 648 595;
#P fasten 29 0 33 0 654 617 752 617 752 563 760 563;
#P fasten 23 0 20 0 782 182 728 182;
#P fasten 19 0 20 0 741 184 728 184;
#P connect 21 0 20 0;
#P fasten 24 0 20 0 819 182 728 182;
#P connect 22 0 21 0;
#P connect 28 0 29 0;
#P connect 27 0 28 0;
#P connect 8 15 5 15;
#P connect 8 14 5 14;
#P connect 8 13 5 13;
#P connect 16 12 5 12;
#P connect 16 11 5 11;
#P connect 16 10 5 10;
#P connect 16 9 5 9;
#P connect 16 8 5 8;
#P connect 16 7 5 7;
#P connect 16 6 5 6;
#P connect 15 0 16 0;
#P connect 15 0 37 0;
#P connect 16 5 5 5;
#P connect 16 4 5 4;
#P connect 7 3 5 3;
#P connect 9 0 15 0;
#P hidden connect 14 0 15 0;
#P fasten 11 0 15 0 477 157 424 157;
#P fasten 12 0 15 0 508 157 424 157;
#P connect 10 0 9 0;
#P connect 7 2 5 2;
#P connect 30 0 26 0;
#P connect 6 0 26 0;
#P connect 7 1 5 1;
#P connect 5 0 6 0;
#P connect 7 0 5 0;
#P connect 2 0 7 0;
#P connect 2 0 36 0;
#P connect 3 0 2 0;
#P fasten 1 0 2 0 147 191 134 191;
#P fasten 17 0 2 0 188 189 134 189;
#P fasten 18 0 2 0 222 188 134 188;
#P connect 4 0 3 0;
#P window clipboard copycount 39;