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Python Version/ffglitch/jscripts/Mirror.js

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+// dd_mirror_X.js
+
+// clean buffer :
+var buffer = [ ];
+
+var ZOOM = -20;
+
+function glitch_frame(frame)
+{
+    // bail out if we have no motion vectors
+    let mvs = frame["mv"];
+    if ( !mvs )
+        return;
+    // bail out if we have no forward motion vectors
+    let fwd_mvs = mvs["forward"];
+    if ( !fwd_mvs )
+        return;
+
+	// note that we perform a deep copy of the clean motion
+    // vector values before modifying them.
+    let json_str = JSON.stringify(fwd_mvs);
+    let deep_copy = JSON.parse(json_str);
+	// stick em in the buffer
+    buffer = deep_copy;
+
+	var M_H = fwd_mvs.length/2;
+    // VERTICALLY
+    for ( let i = 0; i < fwd_mvs.length; i++ )
+    {
+
+        // loop through all rows
+
+        let row = fwd_mvs[i];
+        var row2 = buffer[i];
+        //var row2 = fwd_mvs[(fwd_mvs.length-1)-i];
+
+        var M_W = row.length/2;
+
+		// HORIZONTALLY
+        for ( let j = 0; j < row.length; j++ )
+        {
+            // loop through all macroblocks
+            let mv = row[j];
+			var mv2 = row2[(row.length - 1) - j];
+            // THIS IS WHERE THE MAGIC HAPPENS
+            //if(i>M_W){
+				mv[0] = 0-mv2[0];
+            	mv[1] = mv2[1];
+			//}
+        }
+    }
+}