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diff --git a/media/libtheora/lib/decode.c b/media/libtheora/lib/decode.c
--- a/media/libtheora/lib/decode.c
+++ b/media/libtheora/lib/decode.c
@@ -2072,18 +2072,17 @@ static void oc_dec_init_dummy_frame(th_d
sizeof(_dec->pp_frame_buf[0])*3);
info=&_dec->state.info;
yhstride=abs(_dec->state.ref_ystride[0]);
yheight=info->frame_height+2*OC_UMV_PADDING;
chstride=abs(_dec->state.ref_ystride[1]);
cheight=yheight>>!(info->pixel_fmt&2);
yplane_sz=yhstride*(size_t)yheight+16;
cplane_sz=chstride*(size_t)cheight;
- yoffset=_dec->state.ref_ystride[0]*(yheight-1)-
- (OC_UMV_PADDING+OC_UMV_PADDING*(ptrdiff_t)yhstride);
+ yoffset=yhstride*(ptrdiff_t)(yheight-OC_UMV_PADDING-1)+OC_UMV_PADDING;
memset(_dec->state.ref_frame_data[0]-yoffset,0x80,yplane_sz+2*cplane_sz);
}
int th_decode_packetin(th_dec_ctx *_dec,const ogg_packet *_op,
ogg_int64_t *_granpos){
int ret;
if(_dec==NULL||_op==NULL)return TH_EFAULT;
/*A completely empty packet indicates a dropped frame and is treated exactly
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