Sunday 25 October 2015

4K/UHD Video Discussion (file specs, HEVC, offload procedures, etc.)



It seems 4K/UHD video functionality in smartphones does not get a lot of attention beyond a phone "can do it".

Does anyone have any info on the file specifications of 4K video created by the Nexus 6P - particularly video bitrate which will indicate file sizes/storage requirements?

Also, the Snapdragon 810 in the Nexus 6P apparently can support 4K playback and 4K capture using the new h.265 (aka "HEVC") compression which uses much less storage space. Any word on if this can get used with the Nexus 6P?

Finally, in light of the fact the phone does not have USB 3.0 or MHL 3.0/HDMI for a direct-to-TV connection, Chromecasting is limited to 1080p, and YouTube re-compresses 4K video uploads - what exactly is the procedure for watching the native 4K video files recorded on the Nexus 6P on a 4K television since they will be the highest quality? (This seems to be a question not necessarily aimed just at the Nexus 6P. )

As near as I can tell, you will be relying on a USB 2.0 wired connection from the 6P to offload what are potentially enormous 4K video files to external storage. If you are fortunate enough to have an 802.11ac wireless network, that could be quicker - but unless someone can link to some tests - I have not seen any Nexus 6P 802.11ac throughput numbers to see how they compare to the phone's USB 2.0 speeds.

Any comments regarding these notes would be appreciated.



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