There are some Rockchip-Player out in the world which are needing flipped and rotated videos: The converter of them got the appendix "Smart" or "Smart II". They are mostly using the resolution of 220x176 or 224x176 pixels.
Maybe you need to convert your videos in a flipped and rotated way with viDrops "Rockchip Smart 220x176"-Preset or with "Rockchip Smart II 224x176"-Preset. The MP4 plays them unmirrored and rerotated again - this videos are unwatchable on the PC
(they're running but thei're not really watchable)