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-rw-r--r--src/lib/encoder.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lib/encoder.h b/src/lib/encoder.h
index 4d741a92b..590b8aaa9 100644
--- a/src/lib/encoder.h
+++ b/src/lib/encoder.h
@@ -61,7 +61,7 @@ public:
* @param f Frame number within the film.
* @param s A subtitle that should be on this frame, or 0.
*/
- virtual void process_video (boost::shared_ptr<Image> i, int f, boost::shared_ptr<Subtitle> s) = 0;
+ virtual void process_video (boost::shared_ptr<const Image> i, int f, boost::shared_ptr<Subtitle> s) = 0;
/** Called with some audio data.
* @param d Array of pointers to floating point sample data for each channel.