Skip coefficient cost update in non-RD mode decision setting. Allow
periodical mode and motion vector cost update. Currently every other
8 frames. The increment runtime is a constant number. Hence more
visible for CIF resolution, while negligible for 1080p.
Speed -6 compression performance for rtc set is improved by 4.5%.
Change-Id: I27e0ad7c521fcc2af1d825582cbdd1a27ac4c323
This commit makes a refactoring of the rtc_use_partition. It allows
the encoder to take a preferred block size for non-RD mode decision.
The boundary blocks are handled such that smaller block sizes that
fit in the boundary size will be used instread.
In rtc mode, the coding performance of speed -6 for pedestrian_1080p
goes from
158980 b/f, 38.934 dB, 22721 ms to
159008 b/f, 40.064 dB, 23721 ms.
For rtc set, the speed -6 compression performance is improved by
26%. Still about 2dB behind speed -5 at this point.
Change-Id: If0944f0880eaf1ad340bc325d97cea8d0f9dd53f
This commit enables the use of DC, vertical, and horizontal intra
prediction mode in rtc non-RD mode decision. When the best cost value
of inter modes is above a given threshold, the encoder runs the
above three intra modes and selects the one that has minimum
prediction residual in terms of SAD.
This together with recent changes on non-RD mode decision and coding
control improves compression performance of speed -6 by
derf 91%
yt 61%
hd 46%
stdhd 52%
In terms of encoding speed, it is about 3 times faster than speed -5.
Change-Id: I6b483bfd0307e6482bb22a6676ae4e25a52b1310
When non-RD coding decision is used in rtc mode, the alt reference
is not used for inter frame prediction. This commit disabled alt ref
option whenever speed -6 is used.
Change-Id: I0b33ca03661de1db2d9bef1bcbff848cd4c9396f
In the first coding run of a 64x64 block, check the coding mode
for each 8x8 block. Will need a second annealing stage to decide
the partition size to be encoded.
Change-Id: Ida9417805ff3358979b0c0429d4099c023c88866
In good quality mode motion search, the best matches are normally
found after searching in a large area. In real time mode, to make
encoding fast, a center-biased fast HEX search is used, which
converges quickly most of the time. A 4-point diamond search is
also carried out as the following refining search, which gives more
precise results, and maintains good motion search quality.
At speed 5, the borg test on rtc set showed an overall PSNR loss of
0.936%. The encoding speed gain is 4% - 5%.
Change-Id: I42cd68bb56a09ca1b86293c99d5f7312225ca7ae
Run sub-pixel motion search when NEWMV gives lower rate-distortion
cost. This improves coding performance of derf set by 8%, std-hd by
2.2%.
Change-Id: Ife50f7fda8463927784fe59a41cc439c833e941a
