ffmpeg -i input_sone054.mp4 -c:v libx264 -c:a aac -strict experimental output_fixed_sone054.mp4
Always format your recording media in the camera or device itself, rather than on a PC.
If you are technically inclined and every other method fails, you can manually edit the MP4 header using a hex editor like (Windows) or Hex Fiend (Mac). This involves: