@@ -589,7 +589,7 @@ static void ipvideo_decode_opcodes(IpvideoContext *s)

         s->stride = s->current_frame.linesize[0] >> 1;

     }

     s->line_inc = s->stride - 8;

-    s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride

+    s->upper_motion_limit_offset = (s->avctx->height - 8) * s->current_frame.linesize[0]

                                   + (s->avctx->width - 8) * (1 + s->is_16bpp);

     init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8);