mpeg2dec: Fix lowres 3

Fixes ticket212 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
14 years ago · 33adcdb531
parent af2ed4b748
commit 33adcdb531
1 changed files with 4 additions and 2 deletions
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@ -1722,8 +1722,10 @@ static av_always_inline void mpeg_motion_lowres(MpegEncContext *s,
    if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
        uvsx= (uvsx << 2) >> lowres;
        uvsy= (uvsy << 2) >> lowres;
-        pix_op[op_index](dest_cb, ptr_cb, uvlinesize, h >> s->chroma_y_shift, uvsx, uvsy);
-        pix_op[op_index](dest_cr, ptr_cr, uvlinesize, h >> s->chroma_y_shift, uvsx, uvsy);
+        if(h >> s->chroma_y_shift){
+            pix_op[op_index](dest_cb, ptr_cb, uvlinesize, h >> s->chroma_y_shift, uvsx, uvsy);
+            pix_op[op_index](dest_cr, ptr_cr, uvlinesize, h >> s->chroma_y_shift, uvsx, uvsy);
+        }
    }
    //FIXME h261 lowres loop filter
 }