better motion_subsample_log2 docs

Originally committed as revision 3762 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 8d1ecfa..f53e62a 100644 (file)
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -491,7 +491,8 @@ typedef struct AVPanScan{
     uint32_t *mb_type;\
 \
     /**\
-     * Macroblock size: (0->16x16, 1->8x8, 2-> 4x4, 3-> 2x2)\
+     * log2 of the size of the block which a single vector in motion_val represents: \
+     * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
      * - encoding: unused\
      * - decoding: set by lavc\
      */\