Yunqing Wang [Thu, 1 May 2014 22:14:39 +0000 (15:14 -0700)]
Decide the partitioning threshold from the variance histogram
Before encoding a frame, calculate and store each 16x16 block's
variance of source difference between last and current frame.
Find partitioning threshold T for the frame from its variance
histogram, and then use T to make partition decisions.
Comparing with fixed 16x16 partitioning, rtc set test showed an
overall psnr gain of 3.242%, and ssim gain of 3.751%. The best
psnr gain is 8.653%.
The overall encoding speed didn't change much. It got faster for
some clips(for example, 12% speedup for vidyo1), and a little
slower for others.
Also, a minor modification was made in datarate unit test.
James Zern [Fri, 27 Jun 2014 22:08:07 +0000 (15:08 -0700)]
vp9: disable postproc buffer alloc when unnecessary
the buffer is only used in encoding and only when
CONFIG_INTERNAL_STATS or CONFIG_VP9_POSTPROC is enabled.
a future change should decouple this from the frame buffer allocation
and make it conditional based on runtime flags when the above config
options are enabled.
reduces decode heap usage by at least 12%
Jim Bankoski [Fri, 27 Jun 2014 17:03:15 +0000 (10:03 -0700)]
Better validation of invalid files
This patch checks that a decoder never tries to reference frame that's
outside the range of 2x to 1/16th the size of this frame. Any attempt
to do so causes a failure.
Tim Kopp [Thu, 26 Jun 2014 22:28:08 +0000 (15:28 -0700)]
fix: Only do spatial SVC when there are > 1 layers
Bug introduced in I930dced169c9d53f8044d2754a04332138347409. If
svc.number_temporal_layers == 1 and svc.number_spatial_layers == 1, the system
attempt to do spatial SVC. It no longer does that.
Paul Wilkins [Thu, 26 Jun 2014 10:26:25 +0000 (11:26 +0100)]
Multi-arf: Change ref buffer for primary arf.
For the primary arf in a group, if multiple arfs
are enabled and we were using arfs in the previous
group, then allow the second arf from the previous
group to be used as an additional reference.
Jingning Han [Wed, 25 Jun 2014 23:53:07 +0000 (16:53 -0700)]
Adaptive txfm size selection depending on residual sse/variance
This commit enables an adaptive transform size selection method
for speed -6. It uses largest transform size when the sse is more
than 4 times of variance, i.e., most energy is compacted in the
DC coefficient. Otherwise, use the default TX_8X8. It improves
the compression efficiency for rtc set of speed -6 by 0.8%, no
speed change observed.
Pengchong Jin [Mon, 23 Jun 2014 20:00:16 +0000 (13:00 -0700)]
Skip the partition search for the frame with no motion
This patch allows the encoder to skip the partition search for the
frame if it is an inter frame and only zero motion vectors have
been detected in the first pass. The partition size is directly
assigned according to the difference variance.
Borg tests show overall little performance changes in term of PSNR
(derf -0.027%, yt 0.152%, hd 0.078%, stdhd 0%). The worst case of
PSNR loss is -0.514% from yt. The best PSNR gain is 4.293% from yt.
The second pass encoding speedup for slideshow clips is 15%-40%.
Jingning Han [Tue, 24 Jun 2014 17:45:31 +0000 (10:45 -0700)]
Enable real-time version reference motion vector search
This commit enables a fast reference motion vector search scheme.
It checks the nearest top and left neighboring blocks to decide the
most probable predicted motion vector. If it finds the two have
the same motion vectors, it then skip finding exterior range for
the second most probable motion vector, and correspondingly skips
the check for NEARMV.
The runtime of speed -5 goes down
pedestrian at 1080p 29377 ms -> 27783 ms
vidyo at 720p 11830 ms -> 10990 ms
i.e., 6%-8% speed-up.
For rtc set, the compression performance
goes down by about -1.3% for both speed -5 and -6.
Paul Wilkins [Thu, 26 Jun 2014 08:48:31 +0000 (09:48 +0100)]
Fix quality regression for multi arf off case.
Bug introduced during multiple iterations on: I3831*
gf_group->arf_update_idx[] cannot currently be used
to select the arf buffer index if buffer flipping on overlays
is enabled (still currently the case when multi arf OFF).
Jingning Han [Wed, 25 Jun 2014 18:41:49 +0000 (11:41 -0700)]
Make non-RD intra mode search txfm size dependent
This commit fixes the potential issue in the non-RD mode decision
flow that only checks part of the block to estimate the cost. It
was due to the use of fixed transform size, in replacing the
largest transform block size. This commit enables per transform
block cost estimation of the intra prediction mode in the non-RD
mode decision.
hkuang [Tue, 24 Jun 2014 21:22:09 +0000 (14:22 -0700)]
Revert "Revert 3 patches from Hangyu to get Chrome to build:"
This patch reverts the previous revert from Jim and also add a
variable user_priv in the FrameWorker to save the user_priv
passed from the application. In the decoder_get_frame function,
the user_priv will be binded with the img. This change is needed
or it will fail the unit test added here:
https://gerrit.chromium.org/gerrit/#/c/70610/
Yunqing Wang [Fri, 20 Jun 2014 17:11:34 +0000 (10:11 -0700)]
Reuse inter prediction result in real-time speed 6
In real-time speed 6, no partition search is done. The inter
prediction results got from picking mode can be reused in the
following encoding process. A speed feature reuse_inter_pred_sby
is added to only enable the resue in speed 6.
This patch doesn't change encoding result. RTC set tests showed
that the encoding speed gain is 2% - 5%.
Adrian Grange [Wed, 18 Jun 2014 21:34:24 +0000 (14:34 -0700)]
Fix test on maximum downscaling limits
There is a normative scaling range of (x1/2, x16)
for VP9. This patch fixes the maximum downscaling
tests that are applied in the convolve function.
The code used a maximum downscaling limit of x1/5
for historic reasons related to the scalable
coding work. Since the downsampling in this
application is non-normative it will revert to
using a separate non-normative scaler.
Paul Wilkins [Tue, 17 Jun 2014 14:31:24 +0000 (15:31 +0100)]
Fix some bugs in multi-arf
Fix some bugs relating to the use of buffers
in the overlay frames.
Fix bug where a mid sequence overlay was
propagating large partition and transform sizes into
the subsequent frame because of :-
sf->last_partitioning_redo_frequency > 1 and
sf->tx_size_search_method == USE_LARGESTALL
Paul Wilkins [Mon, 9 Jun 2014 15:25:31 +0000 (16:25 +0100)]
Experiment for mid group second arf.
This patch implements a mechanism for inserting a second
arf at the mid position of arf groups.
It is currently disabled by default using the flag multi_arf_enabled.
Results are currently down somewhat in initial testing if
multi-arf is enabled. Most of the loss is attributable to the
fact that code to preserve the previous golden frame
(in the arf buffer) in cases where we are coding an overlay
frame, is currently disabled in the multi-arf case.
projects / libvpx / log