Hi, Cnaw somebody told me to use xilisoft video converter version 3.1 and choose Xvid profile with video size 224X176,bitrate=200, frame rate 20, aspect auto, same quality false, audio mp2 (not mp3), bit rate 64 or 128, sample 44100,channels 2, disable audio false. i succes to convert my avi file with that sofware so i able to play the file in my mp4 player. I think the conversion only work for rockchip base mp4 player. Don't forget to download k-lite mega codec, because if you don't have the xvid video codec the software won't work. Sorry because my English not good.