Set the duration of Images in Conversion to Video with FFMPY

Question

I am trying to convert multiple images to a video using FFMPY which seemed to be fine. However, the video was show and now I want to change the duration of how long an image appears in a video. One approach came from FFMPEG itself.

ff = ffmpy.FFmpeg(
    executable='/Users/username/Documents/GitHub/python_audio/ffmpeg',
    inputs={
        '/Users/username/Documents/GitHub/python_audio/images/img0.jpeg': ["-framerate=60"],
        '/Users/username/Documents/GitHub/python_audio/images/img1.jpeg': ["-framerate=60"]
    },
    outputs={'movie.mov': ["-filter:a", "atempo=0.5"]}
)
ff.run()

It doesn't work. Now it seems ffmpy is a bit different than FFMPEG's usual commands. Does anybody know how to change the length/duration of an image?

Thanks in advance.

EDIT: Another try:

ff = ffmpy.FFmpeg(
    executable='/Users/username/Documents/GitHub/python_audio/ffmpeg',
    inputs={
        '/Users/username/Documents/GitHub/python_audio/images/img0.jpeg': ["-framerate 25, -loop 1, -t 10"],
        '/Users/username/Documents/GitHub/python_audio/images/img1.jpeg': ["-framerate 25, -loop 1, -t 10"]
    },
    outputs={'movie.mov': ["-filter:a", "atempo=0.5"]}
)
ff.run()

But the response is

ffmpeg version 4.3.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Unrecognized option 'framerate 25, -loop 1, -t 10'.
Error splitting the argument list: Option not found
Traceback (most recent call last):
  File "pyff.py", line 16, in <module>
    ff.run()
  File "/Users/username/Library/Python/2.7/lib/python/site-packages/ffmpy.py", line 105, in run
    raise FFRuntimeError(self.cmd, self.process.returncode, out[0], out[1])
ffmpy.FFRuntimeError: `/Users/username/Documents/GitHub/python_audio/ffmpeg "-framerate 25, -loop 1, -t 10" -i /Users/username/Documents/GitHub/python_audio/images/img1.jpeg "-framerate 25, -loop 1, -t 10" -i /Users/username/Documents/GitHub/python_audio/images/img0.jpeg -filter:a atempo=0.5 movie.mov` exited with status 1

STDOUT:


STDERR: