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-rw-r--r--libavfilter/avfilter.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 7fbdd8a2fb..a685761cfb 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -258,8 +258,11 @@ struct AVFilterPad {
* picture inside the link structure.
*
* Input video pads only.
+ *
+ * @return >= 0 on success, a negative AVERROR on error. picref will be
+ * unreferenced by the caller in case of error.
*/
- void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
+ int (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
/**
* Callback function to get a video buffer. If NULL, the filter system will