avpicture_fill(&spicture, buffer, sfmt, w, h);

  SwsContext *swsCtx = sws_getContext(w, h, sfmt,
                                      svideo->codec->width,
                                      svideo->codec->height,
                                      svideo->codec->pix_fmt,
                                      SWS_BICUBIC, nil, nil, nil);

  sws_scale(swsCtx,
            (const uint8_t * const *) spicture.data,
            spicture.linesize,
            0, svideo->codec->height,
            dpicture.data,
            dpicture.linesize);