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The "from" and "to" topic names should be switched for the input mapping. I have had success implementing this.

Regardless of whether you are remapping an input or an output topic, the "from" is what is topic referenced in the node(let) source code, and the "to" is the rostopic this is the actual input/output.

Here is the exact syntax: http://wiki.ros.org/roslaunch/XML/remap

Name that you are remapping.

from="original-name"

Target name.

to="new-name"

See this as an example: http://gizmosmith.com/2018/09/24/configuring-video-cropping-and-resizing-with-ross-image_proc/