mogrify can only handle single images, and does nto work with image sequences. As such you can not use it with animations.
try using one of the mogrify alternatives...
http://www.imagemagick.org/Usage/basics/#mogrify_not
Coalesce batch
- anthony
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Re: Coalesce batch
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/