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I'm trying to make a slideshow with ffmpeg using a directory of images. On Linux, I can just use -pattern_type=glob but on flutter_ffmpeg (ffmpeg for Flutter apps), glob is not supported. The images are not sequential, they are date formatted like this:

2020-04-09T14:16:52.png 2020-04-09T14:18:53.png 2020-04-09T14:20:54.png 2020-04-09T14:22:55.png 2020-04-09T14:24:56.png 2020-04-09T14:26:57.png 2020-04-09T14:28:58.png 2020-04-09T14:30:59.png 2020-04-09T14:33:00.png 2020-04-09T14:35:01.png 
2020-04-09T14:17:53.png 2020-04-09T14:19:54.png 2020-04-09T14:21:55.png 2020-04-09T14:23:56.png 2020-04-09T14:25:57.png 2020-04-09T14:27:58.png 2020-04-09T14:29:59.png 2020-04-09T14:32:00.png 2020-04-09T14:34:01.png 2020-04-09T14:36:02.png 

If I use each image as an input like this:

ffmpeg -i 2020-04-09T14:30:59.png -i 2020-04-09T14:27:58.png -i 2020-04-09T14:28:58.png output.mp4

output.mp4 is overwritten every time and only contains one image.

How can I use all the files without using glob?

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Rename them in sequential order or use the concat demuxer.

  1. Make input.txt:

    file '2020-04-09T14:16:52.png'
    duration 5
    file '2020-04-09T14:18:53.png'
    duration 5
    file '2020-04-09T14:20:54.png'
    duration 5
    
  2. Run ffmpeg:

    ffmpeg -f concat -i input.txt -vf format=yuv420 -movflags +faststart output.mp4
    

Also see FFmpeg Wiki: Concatenate.

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