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-rw-r--r--doc/writing_filters.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/writing_filters.txt b/doc/writing_filters.txt
index 40935d2cfc..7051f5ec5e 100644
--- a/doc/writing_filters.txt
+++ b/doc/writing_filters.txt
@@ -23,7 +23,8 @@ for others using the `./ffmpeg -v 0 -filters|grep ' V->V '` command.
pattern of the other filters.
- ./configure ...
- make -j<whatever> ffmpeg
- - ./ffmpeg -i tests/lena.pnm -vf foobar foobar.png
+ - ./ffmpeg -i http://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png -vf foobar foobar.png
+ Note here: you can obviously use a random local image instead of a remote URL.
If everything went right, you should get a foobar.png with Lena edge-detected.