On Sat, Aug 18, 2012 at 10:57:15PM +0600, Mashiat Sarker Shakkhar wrote:
> This is very close to 8379ea5e9f6bf3d50663ffb655ba5dd6a11652b4 and same
> description applies. The issue probably warrants further investigation,
> but for now this fix seems to work without breaking anything else.
> ---
> libavcodec/vc1dec.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index 5f709ed..871c033 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -429,8 +429,8 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
>
> if (v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)
> || s->h_edge_pos < 22 || v_edge_pos < 22
> - || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 -
> s->mspel * 3
> - || (unsigned)(src_y - s->mspel) > v_edge_pos - (my&3) - 16 -
> s->mspel * 3) {
> + || (unsigned)(src_x - 1) > s->h_edge_pos - (mx&3) - 16 - 3
> + || (unsigned)(src_y - 1) > v_edge_pos - (my&3) - 16 - 3) {
> uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;
>
> srcY -= s->mspel * (1 + s->linesize);
> --
Maybe the same thing (chroma MV pullback) happens? Please investigate and
update the log message. "I just apply some magic and it works" sounds wrong in
commit.
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