[3r3rni9]

Are there any comparable tools or filters you find useful now? I have an old epileptic cat on my couch, and I’m always worried subjecting her to my horrible old anime. I was just yesterday thinking a filter like this was probably out there, and if not, might be easy to make. Looking for VLC plugins, though, I don’t see anything

[mgdlbp]

VLC:

Tools > Effects and Filters > Video Effects > Advanced > Anti-Flickering

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'

(generate test video):

  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"

antiflicker and deflicker are different implementations

[mgdlbp]

Doh! there's a better filter for this: photosensitivity. It detects local brightness changes that sum to 0, unlike deflicker and apparently the Apple algorithm.

drawgraph can be bodged to convert metadata to frames, and signalstats the opposite. This enables silly things like a self-contained filtergraph mimicking Apple's demo with plots and usable in mpv.

  frames=5
  sensitivity=1.5
  dim_range=2
  dim_intercept=-0.4
  smoothing=10
  smoothtype=am
  decay=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=$decay,  negate,  split[mit1][mit2];
      [mit1][i2]scale2ref[mask][i2];  [i2][mask]alphamerge[m];
      [mit2]signalstats[mitdat];
  [i3]eq=$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://web.archive.org/web/0id_/https://developer.apple.com/accessibility/downloads/video-flashing-reduction-fig12.mp4'

[ar_turnbull]

There’s this chrome plugin for YouTube videos. It stops the video before trigger scenes so you might find it a bit interruptive depending on your (or your cat’s) sensitivity.

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

[dagmx]

To the best of my knowledge, there's nothing else that's realtime like this for end users?

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

[Kye]

This might be helpful: https://www.doesthedogdie.com/are-there-flashing-lights-or-i...