numBytes = avpicture_get_size((enum PixelFormat)frame->format, frame->width, frame->height);
            buffer = (uint8_t*)malloc(numBytes);
            avpicture_layout((AVPicture*)frame, (enum PixelFormat)frame->format, frame->width, frame->height, buffer, numBytes);

            sws_scale(swsContext, frame->data, frame->linesize, 0, frame->height, frameSlice, &frameStride);
            std::cout << "works!" << std::endl;
            sws_scale(swsContext, (uint8_t const * const *)buffer, frame->linesize, 0, frame->height, frameSlice, &frameStride);
            std::cout << "crash!" << std::endl;