Great that it works at all!

However:
how hot, how long before the battery runs out...?

My experiments with x265 vs x264 showed me that a carefully encoded x264 video is only insignificantly larger compared to an equal quality x265-encoded file, while using much less resources (even if the GPU supports HEVC decoding).

I think x265/HEVC makes most sense for streaming, because smallest possible file size.