Originally Posted by jhughy2010
Also, wouldn't transcoding be more efficient too?
To achieve more efficient files after the encode, the encoder is much much slower. Like, factor 10, if not more.
Part of that is that its not very mature yet (so it will get better, but it will always stay much slower than H.264), which also plays in the quality you get out of it. Unless you target extremely low bitrates, HEVC will not offer much improved visual quality yet.
Personally I would argue that at 1/4 the size, HEVC will not achieve the same quality as H.264 did (not with x264 anyway, QuickSync is another matter, its pretty inefficient on quality), especially because the specified HEVC design goal was only 1/2 the size at the same quality.
Are you sure you couldn't turn down your H.264 encodes much more and still get similar quality out of it?
Regarding decoding on your phone/tablet, even if your player on there can decode them, it has one serious downside: battery life.
H.264 encoded content can be decoded with the fixed-function hardware (ASIC) specifically designed for this task, and as such is extremely efficient at it and uses barely no energy doing it. HEVC on the other hand is decoded on the CPU and uses much more processing power, and as a result, also more battery.