ffmpeg – Importing FFMPEF Generated file into imovie

I am generating a .mp4 file using command

ffmpeg  -i input.png -i input.mp3 -vcodec libx264 \ -vf scale=1920:1080,format=yuv420p  -c:v prores_aw movie1.mov

It generate a video. I am able to open the video in quick time player without any problem, but when I try to import the video in imove, the size of the video changes to 0.1s. The length of the generated video from ffmpeg command is about 11 seconds. How do I fix this problem.

I am trying to generate a movie file combining a .png file and a .mp3 file using ffmpeg, I was able to generate a movie which was about 11 seconds, I was able to open the file in quick time players, but when I try to import the video in imovies, or Davinci resolve, then it doesn’t shows me an error, but the length of the video turn out to be just 0.1 seconds.