High CPU usage when playing H264 encoded files in`video:player`

[y8]

Currently playing H264 video in video:player increases CPU usage by ~50% for 720p and by ~70% for 1080p.

Stream:

Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 
1280x720 [SAR 1:1 DAR 16:9], 7390 kb/s, 29.99 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)

CPU (specs):

Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz

OS:

macOS 10.13.4 (17E199)
Darwin 17.5.0 Darwin Kernel Version 17.5.0: Mon Mar  5 22:24:32 PST 2018; root:xnu-4570.51.1~1/RELEASE_X86_64 x86_64
``