unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);
unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);