When I generate a video starting from a sequence of .png snapshots, the output video is black. Here is a minimal working example: I generate the video from these two frames with the following command on Ubuntu 16.04.4 LTS

$ ffmpeg -r 1 -i frame%d.png -pix_fmt yuv420p video.mp4

and obtain a black video.mp4.

Do you know a way around this? I know that a similar question has been asked, for example, here, but the solution does not solve the problem in my case.


Some players don't like low framerate videos. The workaround is to set a high output rate.

ffmpeg -framerate 1 -i frame%d.png -r 5 -pix_fmt yuv420p video.mp4

5 should be enough, but try 10 if not.

  • I tried with -r 5, -r 10 and -r 20, and I still get a black video. – Micha Apr 12 '18 at 21:09
  • Your input is 4096x8192! Many players will refuse to play as that's compliant with a recently added H264 level. Downscale by adding -vf scale=-2:1080,setsar=1 after the -r 5 – Gyan Apr 13 '18 at 6:00

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