Scott LaVarnway [Thu, 16 Dec 2010 14:38:02 +0000 (09:38 -0500)]
Adjusted breakout RD for SPLITMV
vp8_rd_pick_best_mbsegmentation looks at y only. The new
breakout does not include the frame cost, the prob_skip_false
cost, or the uv rate. Performance improved by a few percent
and the quality remained the same.
Yunqing Wang [Tue, 14 Dec 2010 22:39:25 +0000 (17:39 -0500)]
Fix a bug in motion search code(2)
This fix added MV range checks for NEWMV mode as suggested by Jim.
To reduce unnecessary MV range checks, I tried Yaowu's suggestion.
Update UMV borders in NEWMV mode to also cover MV range check.
Also, in this way, every MV that is valid gets checked in diamond
search function.
Yunqing Wang [Tue, 14 Dec 2010 16:00:25 +0000 (11:00 -0500)]
Fix a bug in motion search code
The MV's range is 256. Since the new motion search uses a different
starting MV than the center ref MV, a MV range checking needs to
be done to avoid corruption.
James Berry [Mon, 13 Dec 2010 18:10:58 +0000 (13:10 -0500)]
fixed vpxenc bug where ivf files would be read incorrectly
read_frame would incorrectly insert detect->buf into img
for ivf files. detect->position now set to 4 if input file is
detected to be ivf in file_is_ivf to keep this from occuring.
Yaowu Xu [Mon, 6 Dec 2010 21:33:01 +0000 (13:33 -0800)]
adjust RDMULT for UV plane in quantization RDO
This patch adds a weighting factor on RDMULT for UV blocks. The change
has an overall gain about 0.5% based on ssim, between 0.1 and 0.2% by
psnr numbers.
Scott LaVarnway [Mon, 6 Dec 2010 21:42:52 +0000 (16:42 -0500)]
vp8_rd_pick_best_mbsegmentation code restructure
Moved the code from the segmentation loop into a function
which is now called for each segment. This will allow us
to change the segment order checking more easily.
Paul Wilkins [Sat, 4 Dec 2010 10:04:12 +0000 (10:04 +0000)]
Change to inter_minq table.
The inter_minq table controls the range of quantizers available
for a particular frame in two pass relative to a max Q value.
The changes reduces the range somewhat. The effect of this
was a small increase (0.3% average) in psnr for the test set
but it should also help encode speed somewhat for higher
quality modes as it will reduce the number of iterations in the
recode loop.
The change damps the range of quantizers available locally
within a section of a clip and should therefore help keep quality
more uniform. If there is systematic overshoot or undershoot the
range can shift gradually to accommodate. However, there is
some increased risk of overshoot or undershoot against the target
bit rate in VBR mode and this risk will be more pronounced for short
clips.
The change damps the range of quantizers available locally
within a section of a clip and should therefore help keep quality
more uniform. If there is systematic overshoot or undershoot the
range can shift gradually to accommodate. However, there is
some increased risk of overshoot or undershoot against the
target bit rate in VBR mode and this risk will be more
pronounced for short clips.
Yunqing Wang [Fri, 3 Dec 2010 16:26:21 +0000 (11:26 -0500)]
Improve MV prediction accuracy to achieve performance gain
Add vp8_mv_pred() to better predict starting MV for NEWMV
mode in vp8_rd_pick_inter_mode(). Set different search
ranges according to MV prediction accuracy, which improves
encoder performance without hurting the quality. Also,
as Yaowu suggested, using diamond search result as full
search starting point and therefore adjusting(reducing)
full search range helps the performance.
Fritz Koenig [Thu, 18 Nov 2010 18:40:58 +0000 (10:40 -0800)]
Set refresh_alt_ref_frame on keyframe encode.
On a keyframe alt ref and golden are refreshed. The flag was
not being set and so on the frame after a keyframe, motion
search would occur on the alt ref frame. This is not necessary
because the alt ref frame identical to the last frame in this
scenario.
Handle corner case where a forward alt-ref frame is put
directly after a keyframe.
Pascal Massimino [Wed, 24 Nov 2010 08:22:59 +0000 (00:22 -0800)]
allow dimensions as low as 1 pixel
remove warning comment in vpxenc.c: in case of 1x1 picture,
detect_bytes will be equal to '3' and we'll fall back to
RAW_TYPE.
fix read_frame() by tracking the pre-read buffer length
in the struct detect
Paul Wilkins [Mon, 22 Nov 2010 13:17:35 +0000 (13:17 +0000)]
Recalibration of bits per MB tables
The baseline bits per MB prediction tables have been
re calibrated based on the assumption that bits per mb
is inversely proportional to the quantizer level.
Yaowu Xu [Mon, 1 Nov 2010 21:04:01 +0000 (14:04 -0700)]
remove low pass filtering from two 4x4 intra prediction
In the process of developing new intra prediction modes, tests have
shown removal of the low pass filtering from B_HE_PRED and B_VE_PRED
has an overall minor positive impact in both PSNR and SSIM metric.
Overall difference is about 0.1%. The change shall also have a small
positive impact on speed. Intuitively, this change should also reduce
some of the tendency of "flattening"
Yaowu Xu [Thu, 18 Nov 2010 17:10:30 +0000 (09:10 -0800)]
changed MAX_PSNR to 100
Changing the MAX_PSNR to 100 to allow testing of further experiments
on extending quantizer range to near lossless. With an effective
quantizer of 1, encoder achieves ~68DB, which is consistent with
fdct/idct round trip error.
Yaowu Xu [Tue, 16 Nov 2010 21:58:21 +0000 (13:58 -0800)]
extends the range of tokens
Extending the value range of tokens allows further experiments on
extending quantizer range. Encoder and decoder were verified to
produce matching reconstructed buffers by tests with forced
quantized value of 1.
projects / libvpx / log