There are other offline tests like the Harding test that are run by the content creators (and why you see the epilepsy warnings at the start of shows)

FWIW, I'm not sure if this actually would benefit cats. I'm not up to speed on feline perception, but I know dogs see at a different frame rate than humans so things that won't trigger us might trigger them differently

VLC: Tools > Preferences > Show settings: All > Search: antiflicker

  mpv --vf=deflicker,scale=960x540,pixscope 'https://github.com/apple/VideoFlashingReduction/blob/main/VideoFlashingReduction_Mathematica/Resources/movie.mp4?raw=true'

  ffplay -f lavfi -i "color=777777[x],color=cccccc,
    [x]framepack=frameseq,settb=AVTB,
    setpts=N/TB/${flickerrate:-12},framerate=${interpolated:-24},
    deflicker=size=5:mode=am,scale=640x480,pixscope"

drawgraph is a useful bodge to convert metadata to frames. This enables silly things like mimicking the Apple demo, including graphs.

  frames=5
  sensitivity=1.5
  dim_range=2
  dim_intercept=-0.4
  smoothing=10
  smoothtype=am
  persistence=0.9
  min_contrast=0.0
  min_brightness=0.0
  min_saturation=0.0
  
  ffplay -vf "split[original],  crop=640:360:0:0,
  split=5[i1][i2][i3][i4][i5];
  [i1]photosensitivity=$frames :$sensitivity,
    drawgraph='bg=black@0 :r=60 :s=1x1 :m1=lavfi.photosensitivity.factor
 :fg1=0x010101*round(0xff*clip(VAL*$dim_range+$dim_intercept,0,1))',
 split[sensedat],  deflicker=$smoothing :$smoothtype,
 negate,  lagfun=$persistence,  negate,  split[mit1][mit2];
      [mit1][i2]scale2ref[mask][i2];  [i2][mask]alphamerge[m];
      [mit2]signalstats[mitdat];
  [i3]eq=$min_contrast :$min_brightness :${min_saturation}[a];
    [a][m]overlay,  split[output1][output2];
  [sensedat]drawgraph=lavfi.photosensitivity.badness :0xffff0000
 :bg=white :r=60 :slide=scroll :size=512x256 :min=0 :max=7[bad];
    [bad][i5]scale2ref[badout][reuse];
      [badout]drawtext=fontcolor=2222dd:text='frame     %{metadata\:lavfi.photosensitivity.frame-badness}'[badout];
      [badout]drawtext=fontcolor=0000ff:y=1.2*lh:text='badness %{metadata\:lavfi.photosensitivity.badness}'[badout];
      [badout]drawtext=fontcolor=777700:y=2.4*lh:text='factor      %{metadata\:lavfi.photosensitivity.factor}'[badout];
    [mitdat]drawgraph=lavfi.signalstats.YAVG :0xff00ccdd
 :bg=00000000 :r=60 :slide=scroll :size=512x256 :min=0 :max=255,  vflip[factor];
    [factor][badout]scale2ref[factorout][badout];
      [factorout]drawtext=fontcolor=999900:y=3.6*lh:text='smoothed %{metadata\:lavfi.signalstats.YAVG}'[factorout];
    [badout][factorout]overlay[rplot];
  [i4]signalstats,  drawgraph=lavfi.signalstats.YAVG :0xffff0000
      :bg=white :r=60 :slide=scroll :size=512x256 :min=0 :max=255[lum];
    [lum][reuse]scale2ref[lumout][reuse];
      [lumout]drawtext=fontcolor=ff0000:text='%{pts\:hms} %{pts} %{eif\:n\:d\:5}'[lumout];
      [lumout]drawtext=fontcolor=0000ff:y=1.2*lh:text='avg luma %{metadata\:lavfi.signalstats.YAVG}'[lumout];
  [output1]signalstats,  drawgraph=lavfi.signalstats.YAVG :0xff00ccdd
      :bg=00000000 :r=60 :slide=scroll :size=512x256 :min=0 :max=255[mlum];
    [mlum][lumout]scale2ref[mlumout][lumout];
      [mlumout]drawtext=fontcolor=999900:y=2.4*lh:text='mitigated %{metadata\:lavfi.signalstats.YAVG}'[mlumout];
    [lumout][mlumout]overlay[lplot];
  [reuse][output2][rplot][lplot]xstack=4 :0_0|w0+30_0|w0+30_h0+20|0_h0+20,  [original]hstack" \
  'https://developer.apple.com/accessibility/downloads/video-flashing-reduction-fig12.mp4'

https://chrome.google.com/webstore/detail/seizafe-epilepsy-a...