The flag x->skip_recode interacts badly with
the cpi->sf.use_nonrd_pick_mode and
cpi->sf.skip_encode_sb speed settings.
Restricting the use of the skip_decode flag when
these other speed choices are in use helps quality
for speeds 3 and 4 by a large amount with only a
small impact on speed.
Average improvmentes for 2 pass speed 4:
Derf +8.8%
Yt + 10.53%
Std-Hd +6.95%
yt-hd + 22.95%
Change-Id: I8010876d8012042a11077c92e69d813c3dfa58eb
This is an initial attempt to allow variable block size partition
in non-RD coding flow. It tests 8x8, 16x16 and 32x32 block size per
64x64 block, all using non-RD mode decision and the associated rate
distortion costs from modeling, then selects the best block size to
encode the entire 64x64 block. Such operations are triggered every
other 3 frames. The blocks of intermediate frames will reuse the
collocated block's partition type.
It improves the compression performance by 13.2%. Note that the gains
are not evenly distributed. For many hard clips, the compression
performance is improved by 20% to 28%. Local speed test shows that
it will also increase runtime by 50%, as compared to speed -7. It is
now enabled in speed -6 setting.
Change-Id: Ib4fb8659d21621c9075b3c369ddaa9ecb0a4b204
The use of uninitialized skip flag will trigger inconsistency in
coding statistics, when alternate RD and non-RD coding modes are
enabled. This commit fixes this issue and removes unnecessary if
statements from update_state_rt.
Change-Id: I7d549dcb0e3ef48b999e5bbc78174ba84502cfcf
The block coding skip flags are assigned in the normal RD mode
decision loop. They are then used in the final encoding stage.
In the non-RD mode decision, the forward transform and quantization
stages are replaced by modeling based on SSE and variance of
prediction residues. This commit applies reset to this array in
the non-RD coding mode.
Change-Id: I66584669b035e9c8ac23e95047849ff277472742
This commit moves the position where rdmult is saved to make sure it
is the correct value. Prior, an uninitialized value may be saved and
restored.
This addresses issue:
https://code.google.com/p/webm/issues/detail?id=733
Change-Id: I436407f289169bc63da3c5a6bf609bed16cb71b5
This commit unifies the non-RD partition use cases for both fixed
and variable block sizes. Deprecate and remove the separate function
for fixed partition type only.
Change-Id: I2b6cb945e90c1566f985adcebc4d0757480a8004
Brings back most of Jim's previous patch for choosing
partitioning based on variance while making it compatible
with the current state of the code. Also adds a
nonrd_use_partition() function to recursively encode for any
arbitrary sb_type decisions within a 64x64 block; and
includes some refactoring.
Currently, when the VAR_BASED_PARTITIONING mode is turned on
for speed 7, there is a 10+% speed-up observed.
Experiments/improvements with this new partitioning method
will be conducted subsequently.
Change-Id: Ie6f43bfbde30583e941f450bf07c3b48828c9571
Clean-ups include
a. redundant code in rt -5 speed feature settings
b. code that guarantees square block availability in
rd_auto_partition_range()
Change-Id: Ic7b04d45b6dc15c461e0edbbb4e78aec20348291
This commit replaces SAD cost with modeled rate-distortion cost
for non-RD mode decision. It translates the prediction residual
SSE into estimate rate and reconstruction distorion costs, hence
capturing the quantization setting effect. The compression
performance of speed -7 for rtc set is improved by 14.79%.
Change-Id: Ifda014eb0501d13109fe7f92680bf1410b463632
Set speed features before running frame encoding. This avoids
redundant RD threshold calculation in key frame coding.
Change-Id: If8e3cf2c02976baa59b310c1c23af9eea0c46e36
