Add aspect 4 to known aspect codes, probably SECAM 4:3, at least sample file was 4:3.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3380 b3059339-0415-0410-9bf9-f77b7e298cf2

libmpdemux/video.c

@@ -83,6 +83,7 @@ switch(d_video->demuxer->file_format){
    // fill aspect info:
    switch(picture.aspect_ratio_information){
      case 2:  // PAL/NTSC SVCD/DVD 4:3
+     case 4:  // SECAM 4:3? - XXX check with more files! 
      case 8:  // PAL VCD 4:3
      case 12: // NTSC VCD 4:3
        sh_video->aspect=4.0/3.0;