lowres chroma fix

Originally committed as revision 3517 to svn://svn.ffmpeg.org/ffmpeg/trunk
21 years ago · 718455951c
parent 0f74857497
commit 718455951c
1 changed files with 2 additions and 2 deletions
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@ -2640,8 +2640,8 @@ static always_inline void mpeg_motion_lowres(MpegEncContext *s,
    src_y =(s->mb_y*2*block_s>>field_based) + (motion_y >> (lowres+1));
    
    if (s->out_format == FMT_H263) {
-        uvsx = sx | ((motion_x & 2)>>1);
-        uvsy = sy | ((motion_y & 2)>>1);
+        uvsx = ((motion_x>>1) & s_mask) | (sx&1);
+        uvsy = ((motion_y>>1) & s_mask) | (sy&1);
        uvsrc_x = src_x>>1;
        uvsrc_y = src_y>>1;
    }else if(s->out_format == FMT_H261){//even chroma mv's are full pel in H261