Playback of HEVC/h.265 encoded videos is possible and will work on many platforms – however those can be picky when it comes to the combination of other technical aspects of your video file. Some will e.g. play h.265 videos – but only in mp4/m4v containers. Some might play h.265 videos – but not in combination with certain subtitles/audio formats. Sadly, some vendors offer wider support to stream various combinations in their own apps than through their APIs.
There’s an extensive thread about the dos and don’ts of 4K streaming that you might find helpful.
Beyond that I’ll be closing this thread:
the playback part is covered/available
the transcoding part is already covered in a significantly more popular feature suggestion
