The commit adds a new set of loop filter for macroblock edge filtering.
The new loop filter has a mask to detect so-called "flat" regions. The
detection checks 5 pixels of each side of an edge. If the all pixels
have value with +/-1 from the edge pixel on the same side, the region
is treated as a "flat" region. For such case, a 7 tap filter is used
to change 3 pixel values on each side. The 7 taps are:
[1, 1, 1, 2, 1, 1, 1]/8
The furthest away pixels used as input are +/-5 away from edge. For
non-flat region, we fall back to old filtering. It should be noted
here that the thresholds and filter taps may require more optimization
for best possible results.
Tests on a set of hd clips showed consistent gains:
http://www.corp.google.com/~yaowu/no_crawl/mblpf_hd.html
(avg psnr: .83% glb psnr: .77% ssim: .82%)
Tests on derf set also showed consistent gains:
http://www.corp.google.com/~yaowu/no_crawl/mblpf_derf.html
(avg psnr: .24% glb psnr: .22% ssim: .48%)
Change-Id: I0855b1ff48e79e1175c20b81967137e18b2af352
A problem can arise on static clips with force key frames where
attempts to avoid popping lead to a progressive reduction in key
frame Q that ultimately may lead to unexpected overspend against
the rate target.
The changes in this patch help to insure that in such clips the
quality of the key frames across the clip is more uniform (rather
than starting bad and getting better - especially at low target rates).
This patch also includes a fix that removes a delta on the Y2DC
when the baseline q index < 4 as this is no longer needed.
There is also a fix to try and prevent repeat single step Q adjustment in
the recode loop leading to lots of recodes, especially where the use
of forced skips as part of segmentation has made the impact of Q on
the number of bits generated much smaller.
Patch 2: Amend "last_boosted_qindex" calculation for arf overlay frames.
Change-Id: Ia1feeb79ed8ed014e4239994fcf5e58e68fd9459
filter in a way such that when there is a single bad frame, the
post-processing is applied not only to just that frame but a
few subsequent frames as well.
Change-Id: Iba5d9896eed77244eb76b4a74692a93f8ecff634
When running multi-layer (ML) encodes and dynamically
changing coding parameters on the fly (e.g. frame
duration/rate, bandwidths allocated to each layer)
the encoder would not produce sensible output.
In certain cases the rate targeting would be
hideously inaccurate.
These fixes make it possible to change these coding
parameters correctly and to maintain accurate control
of the rate targeting.
I also added the specification of the input timebase
into the test program, vp8_scalable_patterns.c.
Patch 2: Moved declaration to appease MS compiler)
Change-Id: Ic8bb5a16daa924bb64974e740696e040d07ae363
Add new get_predictor_pointers() and get_reference_search_order()
functions for code shared between the two implementations.
Change-Id: I1ebe76aa8f168b1f5cfabc00d05d8f19a0d4d207
with deblock or demacroblock filters. When --mfqe is used together
with --demacroblock or --deblock, mfqe is applied first and then
demacroblock/deblock is applied to the mfqe result.
Change-Id: Id83ee01f1b4a33a116f071dcf26d59c7f3497c32
precision used in initialization of roundoff is not a constant
updated to use #define MFQE_PRECISION 4
Change-Id: If2fc3d3d633d58a7f4ab34d258c232ec1e5f0a79
The default maximum keyframe interval is 9999, or over five minutes
at normal video rates. When the encoder produces streams with such
a long interval seeking (with correct output) is more expensive,
and live streaming is impossible.
Of course the encoding application should set this parameter
based on its knowledge of the intended use of the stream, but
reducing the default gives better results for applications
which do not.
Change-Id: I900b15d74ce72ecc3ade4d43f758c5cf97a2098a
This patch removes the local copies of the dequantize
constants and implements John's idea as described
in "Make a local copy of the dequantized data" commit.
Change-Id: Ic6b7d681f00bf63263f71ff1e39ab2f80729e8b2
In certain hardware configuration, where mmx code is enabled and
other simd (sse2/sse3) disabled, lacking of this emms caused invalid
internal stats outputs.
Change-Id: I77c61cf6e0448d3f3b8c11781aa9e42f31d231c9
Adds a multiframe postprocessing module to enhance the quality of
certain frames that are coded at lower quality than preceding frames.
The module can be invoked from the commandline by use of the --mfqe
option, and will be most beneficial for enhancing the quality of
frames decoded using scalable patterns.
Uses the vp8_variance_var16x16 and vp8_variance_sad16x16 function
pointers to compute SAD and Variance of blocks.
Change-Id: Id73d2a6e3572d07f9f8e36bbce00a4fc5ffd8961
Except zrun_zbin_boost, 15 AC values are the same for all other
parameters. Removed unneccessary calculation.
Change-Id: I6101c0fe8080bd2b4387c3b04d7ddedbf6010409
The code had a number of constructs like (condition)?1:0,
which is redundant with C's semantics. In the cases where a boolean
operator was used in the condition, simply remove the ternary part.
Otherwise adjust the surrounding expression to remove the condition
(eg, for rounding up. See pickinter.c and rdopt.c)
Change-Id: Icb2372defa3783cf31857d90b2630d06b2c7e1be
