While encoding a frame, its last frame source can be used to give
acurate motion information. This patch prevents last frame to be
overwritten so that it is available during current frame encoding.
The last source is scaled when it is necessary. cpi->Last_Source
points to the last source frame.
Change-Id: I0e1ef5e9e1d2badf9d0c7a1a44a7ed5b24c09425
Use a crude correction factor to correct for
lower compression efficiency at higher encode
speeds when estimating the max Q for the
clip.
Change-Id: I5ae377647f4adf5e91d700a8791fb3b8f70efc73
This commit optimizes the bit allocation for the non-RD coding flow.
It applies slightly better quantizer to the frames, where all blocks
run a non-RD partition search. Such frames typically have better
rate-distortion trade off, thus improving the reconstruction quality
for next few frames reference at reasonably low increment in rate
cost.
The coding performance for rtc set at speed -5 with error-resilient
tuned on and rate control set as cbr is improved by 19.58%. It improved
the coding speed by about 10% for a portion of local test clips.
Change-Id: I9d56696cd4359dc8136ca10aff10fff05aaa2686
For very large size video image, the scaling calculation may need use
value beyond the range of int. This commit upgrade the value to 64bit
to make sure the calculation do not wrap around INT_MAX.
The change corrected the decoder behavior.
The bug affects only very large resolution video because the scaling
calculation was sufficient for image size smaller than 2^13.
This resolves issue:
https://code.google.com/p/webm/issues/detail?id=750
Change-Id: I2d2ed303ca6482f31f819f3c07d6d3e98ef3adc5
This commit adjusted the speed steps in rt mode to make the steps
more evenly spaced on speed and quality, specifically:
1. Merged 3 and 4 into one single step 3 and removed confilicting
features.
2. Move 8, 7, 6, 5 to be 7, 6, 5, 4 repsectively.
Change-Id: I38d56d61531f3561d772aef953c411c8fb38c063
Root cause is the different default register length between x86
and x64 platform. Change spatial_layer_id to long long.
Change-Id: If1a5972365c7a59f7e76cb4fd714610f3d48a8ff
Small speed gain for speed 1.
Quality is generally a little up for speed 2.
Speed 3 was similar to speed 4 but now positioned more
evenly between 2 and 4 speed and quality wise.
(opsnr +5.6% ssim +8.25% across all sets)
Speed 4 is a little slower than before but sizable quality gains.
(opsnr +3.7% ssim +6.8% across all sets)
The code has been cleaned up a bit so that for each incremental
speed step changes over the previous speed step are applied.
This makes it easier to see what is changing from one setting to
the next.
Change-Id: I2d98d0d6230af23486adaec01908f58942a7cdeb
Allow tx search for ARF and GF helps quality but a little slower.
Setting subpel_iters_per_step to 1 improves encode speed.
Setting sf->mode_skip_start = 10 improves speed.
Initial local results suggest overall impact on quality is neutral
but encode is up to 15% faster.
Change-Id: Ibde02cae6626a44c10a1da0cefe888afbb51f037
Removes a TODO. Changed meaning of some parameters
(target-max-percent refresh and starting index) to be
defined relative to superblock. Also, modify turn-off condition.
Change-Id: I5e55f372b7079c24f9cdac0b06fa34620dbf456b
