18.12.1

For a 2 photo 15 second project with one dissolve transition and with fade from black, fade to black.
+ Wav on the audiotrack.

Starts and says about 1 min 38 sec, but after about ten seconds freeze. Only thing what I can do then is rising skinny elephants. It is utterly boring.

I have tried both 4k codecs.
Edit 4 and K.

Ah! Those high definition formats do not work (vp9-h265. If I use just mp4 h264 the rendering goes ok.