* @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
* @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
* @param buf input buffer.
- * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
+ * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
+ size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
+ To signal EOF, this should be 0 (so that the last frame
+ can be output).
* @param pts input presentation timestamp.
* @param dts input decoding timestamp.
* @param pos input byte position in stream.