769c769,772
<                 av_frame_copy(diffFrame, s->last_frame);
---
> 
> 				diffFrame->width = pict->width;
> 				diffFrame->height = pict->height;
> 				av_frame_copy(diffFrame, s->last_frame);
781c784,786
<                 av_frame_copy(diffFrame, s->prev_frame);
---
> 				diffFrame->width = pict->width;
> 				diffFrame->height = pict->height;
> 				av_frame_copy(diffFrame, s->prev_frame);