---
libavcodec/avcodec.h | 18 +++++++++++++++---
1 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index c38bd27..3fe6fc1 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -725,10 +725,22 @@ typedef struct RcOverride{
/* Codec can export data for HW decoding (XvMC). */
#define CODEC_CAP_HWACCEL 0x0010
/**
- * Codec has a nonzero delay and needs to be fed with avpkt->data=NULL,
+ * Encoder or decoder requires flushing with NULL input at the end in order to
+ * give the full and correct output.
+ *
+ * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
+ * with NULL data. The user can still send NULL data to the public encode
+ * or decode function, but libavcodec will not pass it along to the codec
+ * unless this flag is set.
+ *
+ * Decoders:
+ * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to get the delayed data until the decoder no longer
- * returns frames. If this is not set, the codec is guaranteed to never be fed
- * with NULL data.
+ * returns frames.
+ *
+ * Encoders:
+ * The encoder needs to be fed with NULL data at the end of encoding until the
+ * encoder no longer returns data.
*/
#define CODEC_CAP_DELAY 0x0020
/**
--
1.7.1
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