Help IPhone not reading videos

[Layla123]

Hi I'm just wondering why my friends with iPhones can't see any of my videos I send them.
It doesn't matter how I send them..... be it on viber or snapchat.
All they see is a black screen.
Is there anyway o fix this.
I have a sumsung galaxy core

 

[mikedt]

Apple iOS can be rather particular and limited in what type of videos it can actually play. Basically if it comes from an iOS device or iTunes, no problem. What format are you sending the videos in, what's size, codecs, etc. Black screen sounds very much like the video codec used isn't supported on the iPhone. If you can, try 640x480, MP4 which should be the default, your Samsung should be able to do that.