patched ffmpeg nov 2

patches/to_upstream/17_mpegthread.patch

+diff -wurp -N orig/libavcodec/mpegvideo.c ffmpeg-mt/libavcodec/mpegvideo.c
+--- orig/libavcodec/mpegvideo.c 2010-11-04 08:11:14 -0700
++++ ffmpeg-mt/libavcodec/mpegvideo.c    2010-11-04 08:11:24 -0700
+@@ -584,8 +584,7 @@ av_cold int MPV_common_init(MpegEncConte
+         return -1;
+     }
+ 
+-    if(s->avctx->active_thread_type&FF_THREAD_SLICE &&
+-       (s->avctx->thread_count > MAX_THREADS || (s->avctx->thread_count > s->mb_height && s->mb_height))){
++    if(s->avctx->thread_count > MAX_THREADS){
+         av_log(s->avctx, AV_LOG_ERROR, "too many threads\n");
+         return -1;
+     }
+@@ -745,6 +744,11 @@ av_cold int MPV_common_init(MpegEncConte
+     if (HAVE_THREADS && s->avctx->active_thread_type&FF_THREAD_SLICE) {
+         threads = s->avctx->thread_count;
+ 
++        if (s->avctx->thread_count > s->mb_height && s->mb_height) {
++            av_log(s->avctx, AV_LOG_WARNING, "Reducing from %d to %d threads due to height of %d pixels.\n", s->avctx->thread_count, s->mb_height, s->height);
++            threads = s->mb_height;
++        }
++
+         for(i=1; i<threads; i++){
+             s->thread_context[i]= av_malloc(sizeof(MpegEncContext));
+             memcpy(s->thread_context[i], s, sizeof(MpegEncContext));