/usr/lib/pd/extra/Gem/pix_movement2-help.pd is in gem 1:0.93.3-9build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | #N canvas 315 171 666 422 10;
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#X text 40 277 Inlets:;
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#X text 18 226 Arguments:;
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#X obj 451 83 gemhead;
#X text 17 383 Outlet 1: gemlist;
#X text 24 291 Inlet 1: gemlist;
#X obj 451 322 square 3;
#X obj 451 300 pix_texture;
#X text 71 31 Class: pix object (timebased effect);
#X obj 451 151 pix_film;
#X obj 515 151 t f;
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#X restore 464 131 pd open;
#X text 505 77 open a supported;
#X text 506 88 movie-clip;
#X text 523 114 macOS: quicktime;
#X text 516 104 windos: *.AVI;
#X text 523 124 linux: depends...;
#X floatatom 495 190 3 0 100 2 lo_threshold - -;
#X obj 494 206 / 100;
#X text 50 12 Synopsis: [pix_movement2];
#X obj 451 232 pix_movement2;
#X floatatom 549 211 3 0 100 2 threshold - -;
#X obj 548 227 / 100;
#X msg 456 194 bang;
#X text 29 57 Description: timebase IIR-filter for motion detection
;
#X text 14 130 since image-noise can disturb this processing \, changes
between two corresponding pixels that are smaller than "threshold"
are ignored. The "threshold" is initially set to <threshold> and adjusts
itself dynamically downwards towards <lo_threshold> (which is the absolute
minimum);
#X text 15 78 [pix_movement] detects movement in a frame with respect
to the 2 previous frames and a "background"-image and stores it as
a b/w-image (greyscale).;
#X text 64 237 float: <lo_threshold> (0..1);
#X text 66 252 float: <initial_threshold> (0..1);
#X text 24 306 Inlet 1: bang: set the current frame as "background"
;
#X text 24 323 Inlet 2: float: <lo_threshold> changes in the image
that are smaller then <lo_threshold> are ignored;
#X text 24 348 Inlet 3: float: <initial_threshold>;
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