[FFmpeg-cvslog] doc/writing_filters: fix reference to Lenna image

[Clément Bœsch]

ffmpeg | branch: master | Clément Bœsch <u at pkh.me> | Tue Nov 18 21:10:29 2014 +0100| [568f1ecccf5cd2a7e235198e6b6e38e2934e03e8] | committer: Clément Bœsch

doc/writing_filters: fix reference to Lenna image

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=568f1ecccf5cd2a7e235198e6b6e38e2934e03e8
---

 doc/writing_filters.txt |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/writing_filters.txt b/doc/writing_filters.txt
index 40935d2..7051f5e 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.