On Wed, Aug 24, 2011 at 02:36:16PM -0700, Ronald S. Bultje wrote:
> From: "Ronald S. Bultje" <[email protected]>
> 
> Previously, we would leave the left edge uninitialized, which led to
> CBP prediction errors on slice edges, e.g. in SA10098.vc1.
> ---
>  libavcodec/vc1dec.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index ae7906d..bd37bd3 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -3019,7 +3019,7 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
>          s->mb_x = 0;
>          ff_init_block_index(s);
>          memset(&s->coded_block[s->block_index[0]-s->b8_stride], 0,
> -               s->b8_stride * sizeof(*s->coded_block));
> +               (1 + s->b8_stride) * sizeof(*s->coded_block));
>      }
>      for(; s->mb_y < s->end_mb_y; s->mb_y++) {
>          s->mb_x = 0;
> -- 

Looks OK
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