4 ms·

This corresponds to new functionality in the OS updates today around dimming flashing lights https://9to5mac.com/2023/03/27/apple-releases-tvos-16-4-with-new-d

by dagmx 4y ago

This corresponds to new functionality in the OS updates today around dimming flashing lights https://9to5mac.com/2023/03/27/apple-releases-tvos-16-4-with-new-dim-flashing-lights-feature/ https://9to5mac.com/2023/03/27/apple-releases-tvos-16-4-with... https://developer.apple.com/documentation/mediaaccessibility/flashing_lights/responding_to_changes_in_the_flashing_lights_setting https://developer.apple.com/documentation/mediaaccessibility... For epileptics like myself, this is a huge deal. It helps me deal with a lot of media that otherwise might cause me to suffer a seizure.

ar_turnbull 4y ago
I was so happy and pleasantly surprised to see this feature come out today! I just spent the last week telling a client they can’t put their flashy new brand video on their website and still meet AA guidelines. I told them to do a Harding Test and get the company who made it to do the edits because WCAG doesn’t leave any wiggle room when it comes to potential seizures (rightfully so). Glad to see Apple leading in this front. These features aren’t sexy but they make a real difference in people’s lives!
3r3rni9 4y ago
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
- Kye 4y ago
  This might be helpful: https://www.doesthedogdie.com/are-there-flashing-lights-or-images?yesNo=yes&type=23 https://www.doesthedogdie.com/are-there-flashing-lights-or-i...
- ar_turnbull 4y ago
  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-alert-fo/goageegpmdbgenkgkhfhnnjmgmgboegi https://chrome.google.com/webstore/detail/seizafe-epilepsy-a...
- dagmx 4y ago
  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
  - deleted 4y ago
    [deleted]
- mgdlbp 4y ago
  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 4y ago
    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'
FriedPickles 4y ago
Could flashing lights be the new blue light? Even for non epileptics, flashing lights might be associated with eye strain, sleep disruption, migraines, and stress. I may turn this feature on.
- r00fus 4y ago
  This. I know I'm page-rage and even navigate away from webpages or videos with too much flash (whether by accident due to loading issues or by design). I'm not epileptic.
  - tgsovlerkhgsel 4y ago
    I basically only encounter this when I use a machine without an ad blocker. (And holy ** is the Internet bad without one.)
- Edd314159 4y ago
  I’m not epileptic but I find flashing lights extremely unpleasant and will always avoid or look away if I encounter them. Like most accessibility features, you don’t need to have a condition to find value in this one
lomuse 4y ago
Some more documentation on this api is here: https://developer.apple.com/accessibility/#whats-new https://developer.apple.com/accessibility/#whats-new

by dagmx 4y ago

ar_turnbull 4y ago

I was so happy and pleasantly surprised to see this feature come out today! I just spent the last week telling a client they can’t put their flashy new brand video on their website and still meet AA guidelines. I told them to do a Harding Test and get the company who made it to do the edits because WCAG doesn’t leave any wiggle room when it comes to potential seizures (rightfully so). Glad to see Apple leading in this front. These features aren’t sexy but they make a real difference in people’s lives!

3r3rni9 4y ago

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

Kye 4y ago
This might be helpful: https://www.doesthedogdie.com/are-there-flashing-lights-or-images?yesNo=yes&type=23 https://www.doesthedogdie.com/are-there-flashing-lights-or-i...
ar_turnbull 4y ago
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-alert-fo/goageegpmdbgenkgkhfhnnjmgmgboegi https://chrome.google.com/webstore/detail/seizafe-epilepsy-a...
dagmx 4y ago
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
- deleted 4y ago
  [deleted]
mgdlbp 4y ago
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 4y ago
  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'

FriedPickles 4y ago

Could flashing lights be the new blue light? Even for non epileptics, flashing lights might be associated with eye strain, sleep disruption, migraines, and stress. I may turn this feature on.

r00fus 4y ago
This. I know I'm page-rage and even navigate away from webpages or videos with too much flash (whether by accident due to loading issues or by design). I'm not epileptic.
- tgsovlerkhgsel 4y ago
  I basically only encounter this when I use a machine without an ad blocker. (And holy ** is the Internet bad without one.)
Edd314159 4y ago
I’m not epileptic but I find flashing lights extremely unpleasant and will always avoid or look away if I encounter them. Like most accessibility features, you don’t need to have a condition to find value in this one

lomuse 4y ago

Some more documentation on this api is here: https://developer.apple.com/accessibility/#whats-new https://developer.apple.com/accessibility/#whats-new