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-rw-r--r--libavfilter/avfilter.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index ff08f71ced..804d52f683 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -509,7 +509,8 @@ int avfilter_request_frame(AVFilterLink *link);
/**
* Poll a frame from the filter chain.
* @param link the input link
- * @return the number of imediately available frames
+ * @return the number of immediately available frames, a negative
+ * number in case of error
*/
int avfilter_poll_frame(AVFilterLink *link);