On 5/4/2021 11:12 PM, James Almer wrote:
Signed-off-by: James Almer <jamr...@gmail.com>
---
  libavcodec/avcodec.h | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 0ef1676daf..3cf131d0a5 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2097,6 +2097,10 @@ typedef struct AVCodecContext {
       * This callback must use the above value to calculate the required 
buffer size,
       * which must padded by at least AV_INPUT_BUFFER_PADDING_SIZE bytes.
       *
+     * In some specific cases, the encoder may not use the entire buffer 
allocated by this
+     * callback. This will be reflected in the size value in the packet once 
returned by
+     * avcodec_receive_packet().
+     *
       * This callback must fill the following fields in the packet:
       * - data: alignment requirements for AVPacket apply, if any. Some 
architectures and
       *   encoders may benefit from having aligned data.

Will apply.
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