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Apply a G'MIC command on all frames of the specified input video file, in a streamed way.

If a display window is opened, rendered frames are displayed in it during processing.
The output filename may have extension .avi or .mp4 (saved as a video), or any other usual image
file extension (saved as a sequence of images).
This command requires features from the OpenCV library (not enabled in G'MIC by default).

Default values:

first_frame=0, last_frame=-1, frame_step=1 and output_filename=(undefined).