Index: libs/libavcodec/mpeg12.c
===================================================================
--- libs/libavcodec/mpeg12.c	(revision 12709)
+++ libs/libavcodec/mpeg12.c	(working copy)
@@ -3311,10 +3311,19 @@
                             if(mpeg_field_start(s2) < 0)
                         return -1;
                     }
+
+                /*
+                 * backout fix introduced in rev.7538
+                 *
+                 * http://svn.mplayerhq.hu/ffmpeg/trunk/libavcodec/mpeg12.c?r1=7538&view=log
+                 *
+                 * (stops FF working in mythtv)
+                 *
                 if(!s2->current_picture_ptr){
                     av_log(avctx, AV_LOG_ERROR, "current_picture not initalized\n");
                     return -1;
                 }
+                 */
 
                 if(avctx->thread_count > 1){
                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;