# Performance Comparison of H.264 and H.265 Encoders in a 4K FPV Drone Piloting System
## 4 Experimental Results
### Obtained Data
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Class** & **Bitrate** & **PSNR** & **SSIM** & **BRISQUE** & **VMAF** & **Encoding Time** \\  & **(Mbps)** & **(More Is Better)** & **(More Is Better)** & **(Less Is Better)** & **(More Is Better)** & **(Less Is Better)** \\ \hline \multirow{4}{*}{A} & 2.54 (\(-\)21.91\%) & 9.11\% & 4.98\% & \(-\)5.49\% & 18.61\% & 21.91\% \\  & 4.35 (\(-\)1.35\%) & 6.76\% & 2.91\% & \(-\)4.18\% & 10.36\% & 28.48\% \\  & 5.98 (\(-\)6.38\%) & 4.17\% & 1.72\% & \(-\)2.28\% & 6.06\% & 28.40\% \\  & 7.52 (\(-\)1.36\%) & 3.51\% & 1.40\% & \(-\)1.18\% & 4.79\% & 27.57\% \\  & 26.46 (\(-\)31.79\%) & 0.25\% & 0.20\% & 15.88\% & 0.58\% & 34.27\% \\ \hline \multirow{4}{*}{B} & 2.66 (\(-\)25.34\%) & 9.87\% & 4.28\% & \(-\)9.07\% & 22.58\% & 23.47\% \\  & 4.17 (1.96\%) & 7.30\% & 3.09\% & \(-\)7.82\% & 13.21\% & 25.00\% \\  & 4.17 (1.96\%) & 7.30\% & 3.09\% & \(-\)7.82\% & 13.21\% & 25.00\% \\  & 7.66 (2.27\%) & 3.05\% & 1.19\% & \(-\)3.81\% & 4.62\% & 28.97\% \\  & 26.79 (\(-\)29.17\%) & 0.48\% & 0.29\% & 11.85\% & 0.70\% & 44.63\% \\ \hline \multirow{4}{*}{C} & 4.49 (\(-\)22.53\%) & 7.45\% & 7.23\% & \(-\)0.21\% & 20.24\% & 47.96\% \\  & 5.46 (\(-\)2.57\%) & 8.93\% & 7.06\% & \(-\)1.04\% & 21.18\% & 20.99\% \\  & 7.24 (0.08\%) & 6.84\% & 4.72\% & \(-\)0.12\% & 13.84\% & 38.00\% \\  & 13.03 (\(-\)9.36\%) & 2.93\% & 1.82\% & 1.61\% & 4.17\% & 15.53\% \\  & 61.48 (1.07\%) & 0.73\% & 0.38\% & 8.67\% & 0.49\% & 32.21\% \\ \hline \multirow{4}{*}{D} & 3.36 (\(-\)33.23\%) & 8.63\% & 5.00\% & \(-\)7.56\% & 24.43\% & 48.32\% \\  & 4.06 (1.79\%) & 10.31\% & 6.07\% & \(-\)7.83\% & 24.65\% & 33.10\% \\  & 5.91 (0.46\%) & 6.41\% & 3.14\% & \(-\)4.81\% & 11.82\% & 42.63\% \\  & 9.48 (\(-\)3.64\%) & 3.96\% & 1.69\% & \(-\)3.79\% & 4.41\% & 44.69\% \\  & 39.86 (\(-\)14.54\%) & 0.63\% & 0.31\% & 4.67\% & 0.19\% & 80.38\% \\ \hline \multirow{4}{*}{Overall} & 2.49 (\(-\)26.91\%) & 8.24\% & 4.08\% & \(-\)10.45\% & 19.17\% & 24.19\% \\  & 3.95 (\(-\)18.61\%) & 3.91\% & 2.18\% & \(-\)7.88\% & 9.69\% & 31.75\% \\ \cline{1-1}  & 5.79 (\(-\)16.99\%) & 6.24\% & 3.68\% & \(-\)3.59\% & 12.47\% & 9.05\% \\ \cline{1-1}  & 8.69 (\(-\)8.69\%) & 3.92\% & 2.22\% & \(-\)0.36\% & 5.79\% & 11.71\% \\ \cline{1-1}  & 36.37 (\(-\)14.82\%) & 1.26\% & 0.72\% & 6.45\% & 1.35\% & 50.86\% \\ \hline \hline \end{tabular}
\end{table} 
Table 3: libx265 results relative to libx264 (libx264 anchor), objective sequence classification. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Class** & **Bitrate** & **PSNR** & **SSIM** & **BRISQUE** & **VMAF** & **Encoding Time** \\  & **(Mbps)** & **(More Is Better)** & **(More Is Better)** & **(Less Is Better)** & **(More Is Better)** & **(Less Is Better)** \\ \hline \multirow{4}{*}{A} & 2.55 (\(-\)21.91\%) & 9.11\% & 4.98\% & \(-\)5.49\% & 18.61\% & 21.91\% \\  & 4.35 (\(-\)1.35\%) & 6.76\% & 2.91\% & \(-\)4.18\% & 10.36\% & 28.48\% \\  & 5.98 (\(-\)6.38\%) & 4.17\% & 1.72\% & \(-\)2.28\% & 6.06\% & 28.40\% \\  & 7.52 (\(-\)1.36\%) & 3.51\% & 1.40\% & \(-\)1.18\%We averaged the values of some samples from each class and displayed only averages. Furthermore, we averaged all samples and displayed an overall result for each bitrate. The VMAF data from Table 2 are depicted in Figure 10. Note that the size of a bubble represents the encoding time.