Created attachment 101850 [details] Original Video Its not possible to rate a video in portrait format so that it fit the original aspect ratio. There are left and rigt black bars. See screenshot Original.png and Rotate.png
Created attachment 101851 [details] With rotation
Please try with the actual Kdenlive version 18.08.1 - You have to change the project settings as customer to 720x1280. - You have to change the aspect ratio from 16/9 to 9/16 in the project setting. - You have to change the FFMPEG render settings as well. see here: https://forum.kde.org/viewtopic.php?f=265&t=153962
It seems it works. We close this bug. If it still appears in the latest version, please feel free to re-open it and update the affected version number.