Seeking tweaks.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/lib/decoder.h b/src/lib/decoder.h
index be9555dc4..edb532b9c 100644
--- a/src/lib/decoder.h
+++ b/src/lib/decoder.h
@@ -57,14 +57,15 @@ public:
 	/** Seek this decoder to as close as possible to some time,
 	 *  expressed relative to our source's start.
 	 *  @param t Time.
+	 *  @param a true to try hard to be accurate, otherwise false.
 	 */
-	virtual void seek (Time) {}
+	virtual void seek (Time) = 0;
 
 	/** Seek back one video frame */
-	virtual void seek_back () {}
+	virtual void seek_back () = 0;
 
 	/** Seek forward one video frame */
-	virtual void seek_forward () {}
+	virtual void seek_forward () = 0;
 
 	/** @return Approximate time of the next content that we will emit,
 	 *  expressed relative to the start of our source.