Merge commit '38e15df1489d86c016515223ee693e7d0326c56a'

* commit '38e15df1489d86c016515223ee693e7d0326c56a':
  avframe: note that linesize is not the usable data size

Conflicts:
	libavutil/frame.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/frame.h

@@ -117,6 +117,9 @@ typedef struct AVFrame {
      * preference, this is 16 or 32 for modern desktop CPUs.
      * Some code requires such alignment other code can be slower without
      * correct alignment, for yet other it makes no difference.
+     *
+     * @note The linesize may be larger than the size of usable data -- there
+     * may be extra padding present for performance reasons.
      */
     int linesize[AV_NUM_DATA_POINTERS];