51     std::string prefix) const {  in ToString()
53   ss << prefix << "target_bitrate_kbps: " << target_bitrate_kbps;  in ToString()
54   ss << "\n" << prefix << "input_framerate_fps: " << input_framerate_fps;  in ToString()
55   ss << "\n" << prefix << "spatial_idx: " << spatial_idx;  in ToString()
56   ss << "\n" << prefix << "temporal_idx: " << temporal_idx;  in ToString()
57   ss << "\n" << prefix << "width: " << width;  in ToString()
58   ss << "\n" << prefix << "height: " << height;  in ToString()
59   ss << "\n" << prefix << "length_bytes: " << length_bytes;  in ToString()
60   ss << "\n" << prefix << "bitrate_kbps: " << bitrate_kbps;  in ToString()
61   ss << "\n" << prefix << "framerate_fps: " << framerate_fps;  in ToString()
62   ss << "\n" << prefix << "enc_speed_fps: " << enc_speed_fps;  in ToString()
63   ss << "\n" << prefix << "dec_speed_fps: " << dec_speed_fps;  in ToString()
64   ss << "\n" << prefix << "avg_delay_sec: " << avg_delay_sec;  in ToString()
66      << prefix << "max_key_frame_delay_sec: " << max_key_frame_delay_sec;  in ToString()
68      << prefix << "max_delta_frame_delay_sec: " << max_delta_frame_delay_sec;  in ToString()
70      << prefix << "time_to_reach_target_bitrate_sec: "  in ToString()
73      << prefix << "avg_key_frame_size_bytes: " << avg_key_frame_size_bytes;  in ToString()
75      << prefix << "avg_delta_frame_size_bytes: " << avg_delta_frame_size_bytes;  in ToString()
76   ss << "\n" << prefix << "avg_qp: " << avg_qp;  in ToString()
77   ss << "\n" << prefix << "avg_psnr: " << avg_psnr;  in ToString()
78   ss << "\n" << prefix << "min_psnr: " << min_psnr;  in ToString()
79   ss << "\n" << prefix << "avg_ssim: " << avg_ssim;  in ToString()
80   ss << "\n" << prefix << "min_ssim: " << min_ssim;  in ToString()
81   ss << "\n" << prefix << "num_input_frames: " << num_input_frames;  in ToString()
82   ss << "\n" << prefix << "num_encoded_frames: " << num_encoded_frames;  in ToString()
83   ss << "\n" << prefix << "num_decoded_frames: " << num_decoded_frames;  in ToString()
85      << prefix  in ToString()
87   ss << "\n" << prefix << "num_key_frames: " << num_key_frames;  in ToString()
88   ss << "\n" << prefix << "num_spatial_resizes: " << num_spatial_resizes;  in ToString()
89   ss << "\n" << prefix << "max_nalu_size_bytes: " << max_nalu_size_bytes;  in ToString()