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I use Sony Z5 premium docomo.
From the processor specifications used, it supports 4K video, but when I play 4K video, the video does not play smoothly (broken).
Saya menggunakan sony z5 premium docomo.
Dari spesifikasi processor yang digunakan support video 4K namun saat saya memutar video 4K yg terjadi video tersebut tidak dapat diputar dengan mulus(patah-patah)
I've edited your post as this is an English only forum, you can use Google Translate to reply and/or post.
Where are you playing the videos? if you are watching the videos on your phone, are the videos in an SD card or internal storage?