h265 is a very powerful but still not widely supported codec, recently I found myself in the need of prepare some h265 videos and have them played on various smartphones.
While a powerful desktop pc has less issues and is outlet powered modern smartphones still struggle with battery savings.
Recent ones are able to decode h264 / avc and aac audio with dedicated hardware but almost no one have support for h265 / hevc at time I'm writing this answer.
What settings can I use to reduce the CPU consumption (and so the battery) on the target devices? The best goal could be make the final cpu needings close to the h264 ones.
Are presets such as slow, veryslow useful for this task or they are good only for reducing the output file size ?
There are other settings that I can tweak for obtain my pourpouse?
PS: please also provide some examples with ffmpeg, thanks!