In mov demuxer, export .mov encoder metadata tag

Originally committed as revision 25757 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mov.c

@@ -154,6 +154,7 @@ static int mov_read_udta_string(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
     case MKTAG(0xa9,'d','a','y'): key = "date";      break;
     case MKTAG(0xa9,'g','e','n'): key = "genre";     break;
     case MKTAG(0xa9,'t','o','o'):
+    case MKTAG(0xa9,'s','w','r'): key = "encoder";   break;
     case MKTAG(0xa9,'e','n','c'): key = "encoder";   break;
     case MKTAG( 'd','e','s','c'): key = "description";break;
     case MKTAG( 'l','d','e','s'): key = "synopsis";  break;