Set adaptive_rd_thresh to 0 at speed 0. This allows a thorough mode
search, and eliminates a blocking artifact seen in an encoder test.
Borg test:
1. lowres
Overall PSNR: -0.135%; SSIM: -0.293%;
2. hdres
Overall PSNR: -0.122%; SSIM: -0.208%;
Encoder speed tests: 2% - 6% slower.
Change-Id: Ie7601cb8824df8f6f2ae0b2942bd938600f76990
Revisit the compression performance and complexity trade-off after
making the SIMD version of trellis optimizations. Before that,
reduce the transform-quantization function calls temporarily. This
would cause about 0.3% performance drop for lowres set.
Change-Id: I16917a6bd5c44ec6cd8cd0b59f3c336c4fd96dd2
This experiment implements non-uniform quantization where
the width of the bins increases gradually to more closely
match a laplacian distribution of the coeficcients.
Performance Gain:
derflr: 0.15%
hevcmr: 0.675%
Change-Id: I25234244e3bcd94b87c1f77cf682190b61c8ef94
The assumption doesn't hold true in the current codebase. Remove
this speed feature to simplify the codebase.
Change-Id: I9b69f484c9b7cd612b825047cc5b2fce63ee0af7
Seperate prediction mode and tx type search for inter
modes. Enabled for speed >=1.
baseline:
speed increase 40%
compression drop 0.30%/0.29% on lowres/midres
ext-tx:
speed increase 160%
compression drop 1.08%/0.95% on lowres/midres
Change-Id: Ieb34b1ee80df6980d16e26a5783e08cc0deae55b
Add a speed feature to seperate prediction mode and tx type search
for intra modes: search for best intra prediction mode with fixed
default tx type first, then choose the best tx type for the
selected mode.
Coding performance drop:
baseline
lowres 0.10% midres 0.08% hdres 0.14%
with ext-tx
lowres 0.14% midres 0.25% hdres 0.20%
Speed improvement is 20% for baseline and 17% for ext-tx.
It is turned on for speed >= 1.
Change-Id: Ia5e8d39e8a4e2e42c521bfde938f8b6a98ab24f9
Increases number of wedges for smaller block and removes
wedge coding mode for blocks larger than 32x32.
Also adds various other enhancements for subsequent experimentation,
including adding provision for multiple smoothing functions
(though one is used currently), adds a speed feature that decides
the sign for interinter wedges using a fast mechanism, and refactors
wedge representations.
lowres: -2.651% BDRATE
Most of the gain is due to increase in codebook size for 8x8 - 16x16.
Change-Id: I50669f558c8d0d45e5a6f70aca4385a185b58b5b
Without this patch, the experiment of ext-refs showed almost no coding
gains compared to the baseline. This is because when ext-refs is on, the
use of upsampled reference is off.
With this patch, the ext-refs experiment works with the upsampled
references and shows coding gains in Overall PSNR as follows, with ~5%
slow down for encoding time:
lowres: Avg - -0.965; BDRate - -0.844
derflr: Avg - -0.847; BDRate - -0.669
Note that the previous patch a912c6ec314d816767a4c3eb4e5e1bddcc4c1186
that "Make LAST_FRAME always point to the newly coded frame in ext-refs"
made ext-refs work with the upsampled refereces.
Change-Id: Id79248d71760109fb9198af4f45718b17455555f
If --enable-ext-partition is used at build time, the superblock size
(sometimes also referred to as coding unit (CU) size) is extended to
128x128 pixels.
Change-Id: Ie09cec6b7e8d765b7555ff5d80974aab60803f3a
After porting tile coding from VP9 to VP10, some performance
degradation was seen because of the difference between VP9 and
Vp10 baseline. This patch disabled some features in VP10 while
tile coding is turned on. Also, an encoder control API was added
back for this use case.
Change-Id: I8f736db8388408a8cc35320a2f80abb02906571c
Using the up-sampled reference frames in sub-pixel motion search is
enabled as a speed feature for good-quality mode speed 0 and speed 1.
Change-Id: Ieb454bf8c646ddb99e87bd64c8e74dbd78d84a50
This sets up the interface for 3 speed features that progressively
eliminate a greater number of transforms in ext tx using
pre-trained support vector machines.
Each speed feature still needs to be implemented.
Change-Id: Ia508aeadc0cffdc080fb227f357a5d1dfbca08e2
The interintra experiment, which combines an inter prediction and an
inter prediction have been ported from the nextgen branch. The
experiment is merged into ext_inter, so there is no separate configure
option to enable it.
Change-Id: I0cc20cefd29e9b77ab7bbbb709abc11512320325
This change has been imported from VP9 and
alters the nature and use of exhaustive motion search.
Firstly any exhaustive search is preceded by a normal step search.
The exhaustive search is only carried out if the distortion resulting
from the step search is above a threshold value.
Secondly the simple +/- 64 exhaustive search is replaced by a
multi stage mesh based search where each stage has a range
and step/interval size. Subsequent stages use the best position from
the previous stage as the center of the search but use a reduced range
and interval size.
For example:
stage 1: Range +/- 64 interval 4
stage 2: Range +/- 32 interval 2
stage 3: Range +/- 15 interval 1
This process, especially when it follows on from a normal step
search, has shown itself to be almost as effective as a full range
exhaustive search with step 1 but greatly lowers the computational
complexity such that it can be used in some cases for speeds 0-2.
This patch also removes a double exhaustive search for sub 8x8 blocks
which also contained a bug (the two searches used different distortion
metrics).
For best quality in my test animation sequence this patch has almost
no impact on quality but improves encode speed by more than 5X.
Restricted use in good quality speeds 0-2 yields significant quality gains
on the animation test of 0.2 - 0.5 db with only a small impact on encode
speed. On most natural video clips, however, where the step search
is performing well, the quality gain and speed impact are small.
Change-Id: Iac24152ae239f42a246f39ee5f00fe62d193cb98
This condition is not effectively in use. The actual reference
frame masking is done in other route.
Change-Id: Ia59c843bcac7243dada92f0f67658d7ce43df5e8
Take out speed features that affect the compression performance
to simplify the coding route. This commit removes the motion field
mode search used in speed 3.
Change-Id: Ifdf6862cb1ece8261125a56d9d89bcef60758c00
Spatial/temporal svc code was removed. Verified using Borg test,
and the results before and after the change are matching.
Change-Id: I4c2ee5cd560428e3e50be02e57e5871ef4246390
