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iP6+ Slo Mo - Flickering video

C

casjohnr

macrumors 6502
Original poster
Aug 31, 2007
282
243
Loving my iP6+ especially the screen and battery life, anyway I was playing around with the camera recently and I'm getting great pictures and videos but the Slo mo seems to have a problem where it is producing 'flickering' videos.

Example :
https://www.youtube.com/watch?v=jvy6gpptN2k

I don't know if maybe it is the lighting (LED I believe) interfering with the camera?

Sorry about the random music, just there was some conversation in the video that I didn't want to make public!
 
The video is private so I couldn't watch it, but I think I know what you're talking about. Essentially, it's a 'strobe effect' caused by the lights flickering at a different frequency (not sure exactly what, I know some can be ~50Hz) and the camera capturing video at 240/120 fps. Nothing you can really do about it apart from shoot in natural light.

With LEDs, you can often see them flickering when they do slow-motion replays at a sports game. I just found this on YouTube, gives a good example of what happens: https://www.youtube.com/watch?v=JPwMPoXNyyQ&spfreload=10 (At 1:25 there's a good example of it)

You'll probably also notice that slow mo video is much darker; this is simply because at a higher shutter speed, there is less time for light to reach the sensor. Basically, shooting slow mo in conditions with artificial light isn't that great.

Hope that helps.
 
Both fluorescent and LED lights flash at a very high rate when they are on. Your phone's slo-mo will capture that and make it obvious. Try 120 fps mode indoors. Most of the time that does the trick for me. The image will also be much brighter. Only use 240 fps outside during the day.
 
redman042 said:
Both fluorescent and LED lights flash at a very high rate when they are on. Your phone's slo-mo will capture that and make it obvious. Try 120 fps mode indoors. Most of the time that does the trick for me. The image will also be much brighter. Only use 240 fps outside during the day.
Click to expand...

I can't see the video either, but I too believe this is the phenomenon he is experiencing. I see it also when doing slo-mo in a room illuminated by fluorescent lighting.
 
That video is really cool. You can see the effect of three phase power feeding the stadium lights, alternately lighting the player from different directions. :)

cambookpro said:
The video is private so I couldn't watch it, but I think I know what you're talking about. Essentially, it's a 'strobe effect' caused by the lights flickering at a different frequency (not sure exactly what, I know some can be ~50Hz) and the camera capturing video at 240/120 fps. Nothing you can really do about it apart from shoot in natural light.

With LEDs, you can often see them flickering when they do slow-motion replays at a sports game. I just found this on YouTube, gives a good example of what happens: https://www.youtube.com/watch?v=JPwMPoXNyyQ&spfreload=10 (At 1:25 there's a good example of it)

You'll probably also notice that slow mo video is much darker; this is simply because at a higher shutter speed, there is less time for light to reach the sensor. Basically, shooting slow mo in conditions with artificial light isn't that great.

Hope that helps.
Click to expand...
 
> Why not just create a new thread in the appropriate section?

Because people still find those threads in Google, and by searching through the forum directly. Also, the original authors might get notified of a new reply.

There were just 3 or 4 threads total. If there were more I'd probably not bother :)
 
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