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similar filter. We'll pick edgedetect, but any other should do. You can look
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for others using the `./ffmpeg -v 0 -filters|grep ' V->V '` command.
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- edit libavfilter/Makefile, and add an entry for "foobar" following the
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pattern of the other filters.
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- edit libavfilter/allfilters.c, and add an entry for "foobar" following the
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pattern of the other filters.
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- make -j<whatever> ffmpeg
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If everything went right, you should get a foobar.png with Lena edge-detected.