On Sat, Aug 18, 2012 at 10:57:14PM +0600, Mashiat Sarker Shakkhar wrote:
> Interlaced field pictures can have one or two reference pictures, signaled

nit: unless you're Diego or from US colony right form is "signalled"

> by NUMREF syntax element. For single reference pictures, reference picture
> is determined by REFFIELD syntax element.
> ---
>  libavcodec/vc1dec.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index 3e73a1c..5f709ed 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -794,6 +794,7 @@ static void vc1_mc_4mv_chroma(VC1Context *v, int dir)
>      /* calculate chroma MV vector from four luma MVs */
>      if (!v->field_mode || (v->field_mode && !v->numref)) {
>          valid_count = get_chroma_mv(mvx, mvy, intra, 0, &tx, &ty);
> +        chroma_ref_type = v->reffield;
>          if (!valid_count) {
>              s->current_picture.f.motion_val[1][s->block_index[0] + 
> v->blocks_off][0] = 0;
>              s->current_picture.f.motion_val[1][s->block_index[0] + 
> v->blocks_off][1] = 0;
> -- 

looks OK
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