the footage as Chromium shows it (screenshots while it plays), against the lossless frames (rows 424-844, blurred 4 px)
  frame  14: after half RMS 0.169 L* (mean -0.139); rings kept, correlation 0.991; contour pixels, lossless -> browser: before 55 -> 2653, after 0 -> 693
  frame  28: after half RMS 0.135 L* (mean -0.105); rings kept, correlation 0.994; contour pixels, lossless -> browser: before 44 -> 1831, after 0 -> 529
  frame  42: after half RMS 0.099 L* (mean -0.051); rings kept, correlation 0.994; contour pixels, lossless -> browser: before 115 -> 2045, after 0 -> 956
  frame  55: after half RMS 0.130 L* (mean -0.099); rings kept, correlation 0.997; contour pixels, lossless -> browser: before 79 -> 1686, after 0 -> 1381
  frame  69: after half RMS 0.160 L* (mean -0.138); rings kept, correlation 0.998; contour pixels, lossless -> browser: before 14 -> 1538, after 0 -> 785
  frame  83: after half RMS 0.196 L* (mean -0.172); rings kept, correlation 0.994; contour pixels, lossless -> browser: before 0 -> 4217, after 0 -> 1251
  mean: after half RMS 0.148 L*; correlation 0.995; contour pixels before 51 -> 2328, after 0 -> 932
