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it probably means:

you don't have opencv_videoio_ffmpeg412.dll on your path. since it could not find it, it tried to write an image sequence, and this lacked some pattern, like img%05d.png

remedy:

append the folder containing opencv_videoio_ffmpeg412.dll to your PATH env var.

it probably means:

you don't have opencv_videoio_ffmpeg412.dll on your path. path (this contains the actual video codecs).

since it could not find it, it tried to write an image sequence, sequence instead, and this lacked some pattern, like img%05d.png

remedy:

append the folder containing opencv_videoio_ffmpeg412.dll to your PATH env var.

it probably means:

you don't have opencv_videoio_ffmpeg412.dll on your path (this contains the actual video codecs).

since it could not find it, it tried to write an r eadan image sequence instead, and this lacked some pattern, like img%05d.png

remedy:

append the folder containing opencv_videoio_ffmpeg412.dll to your PATH env var.

it probably means:

you don't have opencv_videoio_ffmpeg412.dll on your path (this contains the actual video codecs).

since it could not find it, it tried to r eadan fall back to read an image sequence instead, and this lacked some pattern, like img%05d.png

remedy:

append the folder containing opencv_videoio_ffmpeg412.dll to your PATH env var.

(again, error is already reading the video, not writing)