When using Smoothie I got the following error
pps\Smoothie\current\Smoothie\vitamix.vpy" --arg input_video="C:\Users\philm\Downloads\killingcolerful_final.mov" --arg mask_directory="C:\Users\philm\scoop\apps\Smoothie\current\Smoothie\masks" -y - --arg config="{'interpolation': {'enabled': True, 'fps': 1980, 'mask': 'weak', 'speed': 'medium', 'tuning': 'weak', 'algorithm': 23, 'gpu': True}, 'frame blending': {'enabled': True, 'fps': 24, 'intensity': 0.65, 'weighting': 'equal'}, 'flowblur': {'enabled': True, 'amount': 3, 'mask': None}, 'encoding': {'process': 'ffmpeg.exe', 'args': '-c:v libx264 -preset slower - aq-mode 3 -crf 15'}, 'misc': {'mpv bin': 'mpv', 'stay on top': True, 'verbose': False, 'ding after': 1, 'folder': 'C:\\Users\\philm\\Downloads', 'container': '.MP4', 'flavors': 'fruits', 'dedupthreshold': 0}, 'timescale': {'in': 1.0, 'out': 1.1}}"', 'ffmpeg.exe -hide{'interpolation': {'enabled': True, 'fps': 1980, 'mask': 'weak', 'speed': 'medium', 'tuning': 'weak', 'algorithm': 23, 'gpu': True}, 'frame blending': {'enabled': True, 'fps': 24, 'intensity': 0.65, 'weighting': 'equal'}, 'flowblur': {'enabled': True, 'amount': 3, 'mask': None}, 'encoding': {'process': 'ffmpeg.exe', 'args': '-c:v libx264 -preset slower - aq-mode 3 -crf 15'}, 'misc': {'mpv bin': 'mpv', 'stay on top': True, 'verbose': False, 'ding after': 1, 'folder': 'C:\Users\philm\Downloads', 'container': '.MP4', 'flavors': 'fruits', 'dedupthreshold': 0}, 'timescale': {'in': 1.0, 'out': 1.1}}
[NULL @ 0000018735f204c0] Unable to find a suitable output format for 'pipe:'
pipe:: Invalid argument
Error: fwrite() call failed when writing frame: 1, plane: 0, errno: 32
Output 10 frames in 15.91 seconds (0.63 fps)
VapourSynth and/or FFmpeg failed, here's a bunch of info you can share to help us debug
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[process exited with code 1 (0x00000001)]