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-rw-r--r--libavcodec/avcodec.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 9c246c455c..96ee88c4fa 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2647,7 +2647,8 @@ int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
*
* frame->time_base should be set to the same value as
* avctx->time_base. This is not required yet, but may be in
- * the future.
+ * the future. frame->duration will be ignored unless time_base
+ * is set.
*
* For audio:
* If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame