Apart from that, x265 is not yet available for users, only for testers with sound background knowledge in video coding algorithms, and working with CLI encoders (at least by editing a batch file) is the least issue in the current stage of development.
There is no complete feature implementation yet.
There is no stabe set of command line options yet.
How often do you expect a GUI to follow sudden and unexpected changes in the set of encoder options?
And yes: There is not even support for streaming video sources (pipe / AviSynth) yet. GUIs could not efficiently serve frames to such an encoder.
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