On 2014-10-17 23:09, Nicholas Robbins wrote: >> So is it possible to make a filter that is basically just a wrapper around >> another filter? This hypothetical filter (call it vf_keystone) would just >> call >> vf_perspective with crazy options. Clearly I could just copy the >> vf_perspective >> filter and then insert these changes, but than any future changes to >> vf_perspective wouldn't filter down to vf_keystone. >> >> Is this possible?
Yes, it is very possible to make a wrapper around another filter. If you wanted to do it for this use case I would suggest these steps: - Add some more fields to the perspective private context to store user options. - Create a new options table for your "new filter" - Add a branch and suitable code in the init function to turn the new options into the old options. - Add a new AVFilter definition for your new filter, have it use the new options table but the existing functions.
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