Desktop command doesn't work on mobile

[lukepighetti]

Command that works on the Desktop doesn't work with flutter_ffmpeg

macOS ffmpeg command

ffmpeg -i trudy.mp4 -vf 'fps=1, scale=120:120:force_original_aspect_ratio=decrease' thumb%d.png

Creates a 120 longest side thumbnail for every second of video.

flutter_ffmpeg command

ffmpeg -i /private/var/mobile/Containers/Data/Application/F4CBC902-553E-4240-A852-53178223D235/tmp/9979E51A-DF2B-46E3-AFE6-7A7317CD2A84.MOV -vf 'fps=0.33419977720014854, scale=120:120:force_original_aspect_ratio=decrease' /var/mobile/Containers/Data/Application/F4CBC902-553E-4240-A852-53178223D235/Library/Caches/ffmpeg-thumbnailsXERYzx/thumb%d.png

returns

flutter: Unable to find a suitable output format for 'ffmpeg'
flutter: ffmpeg: Invalid argument

Is this due to the quotes in strings limitation? tanersener/mobile-ffmpeg#190 How am I supposed to do the multiple video filters without strings?

[lukepighetti]

It appears you can get around this like so:

    final arguments = [
      "-i",
      file.path,
      "-vf",
      "fps=$fps, scale=120:120:force_original_aspect_ratio=decrease",
      "${newDirectory.path}/thumb%d.png"
    ];

    print(arguments);

    final result = await _ffmpeg.executeWithArguments(arguments);

Leaving open for comment/close from @tanersener . Thanks!

[tanersener]

You shouldn't start a command with ffmpeg. flutter_ffmpeg already adds ffmpeg to the beginning of your command.