Or you can use '-f concat' and specify a text file with the explicit order of image files to be used as input - no need to hope and pray that the wildcard will

Or you can use '-f concat' and specify a text file with the explicit order of image files to be used as input - no need to hope and pray that the wildcard will pick the files in the correct order. see https://trac.ffmpeg.org/wiki/Concatenate https://trac.ffmpeg.org/wiki/Concatenate or https://shotstack.io/learn/use-ffmpeg-to-concatenate-video/ https://shotstack.io/learn/use-ffmpeg-to-concatenate-video/