[FFmpeg-user] question about displace filter

[Michael Koch]

In the documentation for the displace filter is written:
"The second input specifies how much to displace pixels along the 
x-axis, ..."
If I understand this right, a video input file is "misused" for storing 
the displacement (instead of brightness). Does that mean that only 
positive displacements are possible?
I'm looking for a solution to make curved text for a fulldome video.

Thanks,
Michael