[x265] information about --hevc-aq follow up

[nalla shanaha]

Following on from the previous email, here are results of some testing.

The files are 1080p videos from youtube

1) mortal engines movie trailer  (youtube.com/watch?v=IRsFc2gguEg)
2) polar movie trailer           (youtube.com/watch?v=oMHwRal-AR8)
3) solo  movie trailer           (youtube.com/watch?v=XRRNxIZfjHA)

All ratio are normalized taking x265 2.8+74-fd517ae68f93 as base
x265 3.0 is version 3.0_RC+10-42b51d791a34

x265 2.8 is from
https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz
x265 3.0 is from
https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-amd64-static.tar.xz

all videos were encoded with 1.77 aspect ratio, i.e 424x240,
640x360,854x480 from the 1080p source videos

--preset faster --crf 28 was used in all cases.


+----------+------------------------------------------------------------------+
|   file   |                 bit rate ratios (x265 2.8 is 1x)                 |
+----------+------------------------------------------------------------------+
| 1)Polar  | +--------------+--------------+------------+-------------------+ |
|          | | video height | --no-hevc-aq | --hevc-aq  | percent reduction | |
|          | +--------------+--------------+------------+-------------------+ |
|          | |     240      |    1.231     |   0.725    |        41.1       | |
|          | |     360      |    1.115     |   0.649    |        41.8       | |
|          | |     480      |    1.104     |   0.679    |        38.5       | |
|          | +--------------+--------------+------------+-------------------+ |
| 2)Mortal | +--------------+--------------+------------+-------------------+ |
|          | | video height | --no-hevc-aq | --hevc-aq  | percent reduction | |
|          | +--------------+--------------+------------+-------------------+ |
|          | |     240      |    1.164     |   0.633    |        45.6       | |
|          | |     360      |    1.149     |   0.681    |        40.7       | |
|          | |     480      |    1.079     |   0.668    |        38.1       | |
|          | +--------------+--------------+------------+-------------------+ |
|  3)Solo  | +--------------+--------------+------------+-------------------+ |
|          | | video height | --no-hevc-aq | --hevc-aq  | percent reduction | |
|          | +--------------+--------------+------------+-------------------+ |
|          | |     240      |    1.088     |   0.711    |        34.7       | |
|          | |     360      |    1.046     |   0.741    |        29.1       | |
|          | |     480      |    0.995     |   0.739    |        25.8       | |
|          | +--------------+--------------+------------+-------------------+ |
+----------+------------------------------------------------------------------+


+----------+----------------------------------------------+
|   file   |        speed ratios (x265 2.8 is 1x)         |
+----------+----------------------------------------------+
| 1)Polar  | +--------------+--------------+------------+ |
|          | | video height | --no-hevc-aq | --hevc-aq  | |
|          | +--------------+--------------+------------+ |
|          | |     240      |    0.936     |   0.147    | |
|          | |     360      |    0.998     |   1.035    | |
|          | |     480      |    1.013     |   1.055    | |
|          | +--------------+--------------+------------+ |
| 2)Mortal | +--------------+--------------+------------+ |
|          | | video height | --no-hevc-aq | --hevc-aq  | |
|          | +--------------+--------------+------------+ |
|          | |     240      |    0.917     |   1.008    | |
|          | |     360      |    0.966     |   1.077    | |
|          | |     480      |    0.969     |   1.037    | |
|          | +--------------+--------------+------------+ |
|  3)Solo  | +--------------+--------------+------------+ |
|          | | video height | --no-hevc-aq | --hevc-aq  | |
|          | +--------------+--------------+------------+ |
|          | |     240      |    0.944     |   0.998    | |
|          | |     360      |    1.017     |   1.044    | |
|          | |     480      |    0.989     |   1.033    | |
|          | +--------------+--------------+------------+ |
+----------+----------------------------------------------+