video diff filter

[ylluminate]

It would be useful to have a visual diff tool for videos that will create a resultant differential video of two videos. This could be used in a number of scenarios from simply seeing more easily the differences of one encode to the next to many other applications.

With some overlay+pad magic you should be able to compare img1,img2 and diff on the same image. Similarly should function with vid frames.

It would be useful to have a few different styles of diffing from an outline to color inversion and clipping similar to what is demonstrated here: ​http://jeffkreeftmeijer.com/2011/comparing-images-and-creating-image-diffs/

[Carl Eugen Hoyos]

See also ticket #944.

[Clément Bœsch]

There is a vf compare patch on the fork mailing list. Since there is no activity related since a while, someone may want to pick it and make something out of it. It shouldn't require that much work.

[Elon Musk]

The compare filter does something completely different and does not look proper to use it for extending with diff stuff.

diff filter could be just be subset of blend filter.

[Elon Musk]

You can use blend filter : blend=all_mode=difference (among others) or make your own with eval expr, documentation with examples is in usual place.