Make sure mpeg2 has its height rounded up to 32 as that is needed

for interlaced stuff.
This might have been exploitable when emu edge was not set though
note this bug has been introduced just a few days ago.

Originally committed as revision 18405 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/utils.c

@@ -144,6 +144,8 @@ void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
     case PIX_FMT_YUVA420P:
         w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
         h_align= 16;
+        if(s->codec_id == CODEC_ID_MPEG2VIDEO)
+            h_align= 32; // interlaced is rounded up to 2 MBs
         break;
     case PIX_FMT_YUV411P:
     case PIX_FMT_UYYVYY411: