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@ari-koivula ari-koivula released this 04 Oct 07:06
· 1282 commits to master since this release
v1.0.0
e7cdd47

It's been 9 months since last release. Now that the encoder just got 10x faster (on veryslow), and quite a bit faster and better on every other preset as well, I think it's time for a major verson bump.

Average BD bitrate (QP 17, 22, 27, 32) v1.0.0 vs v0.8.3

Class 0-uf 1-sf 2-vf 3-fr 4-f 5-m 6-s 7-sr 8-vs
A -16.4% -26.9% -27.5% -31.0% -11.2% -11.9% -11.3% -6.7% -4.8%
B -16.2% -33.7% -31.7% -37.6% -11.6% -14.8% -15.7% -9.1% -6.3%
C -7.0% -17.6% -28.0% -31.2% -8.3% -9.0% -11.3% -7.1% -8.1%
D -3.7% -12.3% -29.2% -30.3% -5.4% -5.9% -11.5% -8.3% -9.9%
E -28.4% -42.6% -33.5% -39.4% -22.6% -28.5% -20.3% -7.0% -0.7%
F -6.1% -11.3% -12.8% -16.5% -10.1% -2.1% 2.3% 10.8% 6.4%

|
|All|-13.0%|-24.1%|-27.1%|-31.0%|-11.5%|-12.0%|-11.3%| -4.6%| -3.9%|

Average speedup (QP 17, 22, 27, 32) v1.0.0 vs v0.8.3

Class 0-uf 1-sf 2-vf 3-fr 4-f 5-m 6-s 7-sr 8-vs
A 1.61x 1.91x 1.89x 1.37x 2.69x 3.33x 4.79x 7.32x 11.06x
B 1.65x 1.98x 1.96x 1.46x 2.67x 3.36x 4.79x 8.15x 13.89x
C 1.76x 1.97x 1.98x 1.45x 2.52x 2.97x 4.87x 9.32x 15.77x
D 2.09x 1.87x 1.81x 1.32x 1.97x 2.36x 5.13x 8.78x 12.65x
E 1.91x 1.96x 1.75x 1.40x 3.00x 3.70x 4.87x 6.06x 7.56x
F 1.84x 1.83x 1.74x 1.41x 2.86x 2.98x 4.60x 8.18x 13.58x

|
|All|1.81x|1.92x|1.86x|1.40x|2.62x|3.12x|4.84x|7.97x|12.42x|

Paramaeters: --threads=4 --owf=1 --wpp -p64

New Features

  • --version
  • --help
  • --loop-input
  • --mv-constraint to constrain motion vectors
  • --tiles=2x2 as an alternative syntax for uniform tiles
  • --hash=md5
  • Print information about what SIMD optimizations are in use
  • --mv=full8 --mv=full16 --mv=full32 --mv=full64
  • --cu-split-termination=zero/off
  • --crypto for selective encryption of bitstream (for OpenHEVC)
  • --me-early-termination=sensitive/on/off for early termination of motion vector search
  • Added 4x8 SMP and 4x12 AMP motion partitions
  • --subme=0/1/2/3/4 for control over complexity of fractional pixel motion prediction
  • --lossless for lossless coding
  • Monochrome coding
  • --input-format=420/400
  • --input-bitdepth=8/10
  • --tmpv for temporal motion vector predictor
  • --rdoq-skip for not using rdoq for situations where it's unlikely to improve BDRate
  • Modified --gop=lp-g4d3r1t1 syntax to not take the reference frames as a parameter, it's now --gop=lp-g4d3t1.
  • Enable WPP and multithreading by default, with detection for number of cores
  • Update all presets to ratedistortion-complexity optimized versions. These are based on a search of all (~ish) possible encoding parameters and bring a huge boost to both speed and BDRate when encoding with the presets (10x speed for veryslow, ~1.1x-4x for others, up to 30% improved BDRate for some presets).
  • Set default options to match medium with intra period of 64, QP 22 and --gop=lp-g4d3t1
  • --implicit-rdpcm RExt feature

Optimizations

  • AVX2 version for Sample Adaptive Offset (SAO)
  • Optimized memory copying
  • AVX2 versions of filters for fractional pixel motion estimation
  • AVX2 version for half pixel chroma sampling for SMP/AMP
  • AVX2 versions for calculating two or four SATD values at once for small blocks
  • Rewrote AVX2 version of fractional pixel motion compensation
  • Rewrote motion vector cost calculation. It only got slightly faster, but BDRate improved a bunch due to the new implementation being more correct.
  • Made AVX2 SAD use SSE4.1 for cases where there isn't an AVX2 implementation, speeding up SMP/AMP.

Bugfixes

  • Fixed a bug in rate control where an int overflowed after coding 2^31 bits (2Gb)
  • Fixed non-determinism intiles
  • Fixed chroma reconstruction bug in tiles
  • Fixed a bug with calculating the number of bits used for intra mode on 4x4 CUs
  • Stopped checking zero motion vector multiple times in motion compensation
  • Fixed possible segfault in motion compensation
  • Fixed a race condition with OWF and SMP/AMP
  • Gave pthread_cond_timedwait time in correctly, such that main thread now sleeps instead of busylooping when it has nothing to do
  • Fixed rate control with lp-gop
  • Fixed full search not taking temporal motion vector into account
  • Allow non-gop-length intra period for lp-gop

Code / Building / Testing

  • Moved SAO to it's own file
  • Removed a ton of unnecessary includes
  • Updated autotools ax_pthread
  • Added build test for OS-X for Travis
  • Made tests check for bitstream correctness
  • Refactored some of the copypasta in motion vector search starting point selection
  • Refactored the cu_info_t datastructures to hold information at a 4x4 resolution needed for AMP and SMP
  • Changed cu_info_t to use bitfields to negate the effect of increasing the cu_info_t array by a factor of 4
  • Moved bitstream generation from encoderstate.c to encode_coding_tree.c
  • Renamed encoder_state_t.global to frame, which makes sense since it hold frame level data, not global data
  • Rewrote integer vector inter prediction, because it was so bad
  • Refactored init_lcu_t
  • Added more tests for inter SAD
  • Added speed tests for dual intra SAD functions
  • Added more realistic speed tests for inter SAD

Other

  • Added a manpage
  • Added scripts for updating manpage and README based on --usage.
  • Added a Dockerfile. Just because.
  • Added commit date to --version
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