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2023-02-03 v3.6.0
This release includes compression efficiency and perceptual quality
improvements, speedup and memory optimizations, and some new features.
This release is ABI compatible with the last release.
- New Features
* New values 20-27 (corresponding to levels 7.0-7.3 and 8.0-8.3) for
the encoder control AV1E_SET_TARGET_SEQ_LEVEL_IDX (note that the
proposal to add the new levels are still in draft status). The
original special value 24 (keep level stats only for level
monitoring) is renumbered as 32.
* New encoder control AV1E_SET_SKIP_POSTPROC_FILTERING to skip the
application of post-processing filters on reconstructed frame in
all intra mode.
* New encoder option "kf-max-pyr-height": Maximum height of pyramid
structure used for the GOP starting with a key frame (-1 to 5).
* Make SVC work for screen content.
* Rate control improvements to reduce frame-size spikes for screen
content coding.
* RISC-V architecture support with gcc toolchain.
- Compression Efficiency Improvements
* Peak compression efficiency in VOD setting is improved by 1%.
* 0.7% - 2.2% RTC encoding BDrate gains for real time speed 8 to 10.
* 15% RTC encoding BDrate gains for screen content speed 10.
- Perceptual Quality Improvements
* Resolved a visual quality issue that was reported for high
resolution clips (2K) for speed 4 and above in VOD use case.
* Visual quality improvements to screen content coding.
* Quality improvements to temporal layer RTC coding.
- Speedup and Memory Optimizations
* RTC single-thread encoder speedup:
o ~6% instruction count reduction for speed 5 and 6.
o ~15% instruction count reduction for speed 7.
o ~10% instruction count reduction for speed 8 to 10 (>=360p
* RTC multi-thread encoder speedup (beyond single-thread speedup):
o 5-8% encode time reduction for speed 7 to 10.
* RTC screen-content encoder speedup:
o 11% instruction count reduction for speed 9 and 10 (>=720p
* ~5% reduction in heap memory requirements for RTC, speed 6 to 10.
o 4-5% speedup for speed 9 in still-picture encoding mode.
o 3-4% heap memory reduction in still-picture encoding mode for
360p-720p resolutions with multiple threads.
- Bug Fixes
* Added a workaround for an AV1 specification bug which makes
TRANSLATION type global motion models unusable.
* Fixed AddressSanitizer global-buffer-overflow errors in
* Fixed AddressSanitizer heap-buffer-overflow error in
* chromium:1393384 Avoid scene detection on spatial resize.
* aomedia:3308 Remove color artifacts under high motion.
* aomedia:3310 Avoid out of memory failures with Visual Studio 2017,
2019, and 2022 for Win32 x86 builds.
* aomedia:3346 Make SVC work properly for screen content.
* aomedia:3348 Fix a bug where an uninitialized search_site is used.
* aomedia:3365 Work around what seems like a Visual Studio 2022
compiler optimization bug.
* aomedia:3369 Incorrect PSNR values reported by libaom for 12-bit
2022-08-31 v3.5.0
This release is ABI compatible with the last one, including speedup and memory
optimizations, and new APIs and features.
- New Features
* Support for frame parallel encode for larger number of threads. --fp-mt
flag is available for all build configurations.
- Speedup and Memory Optimizations
* Speed-up multithreaded encoding for good quality mode for larger number of
threads through frame parallel encoding:
o 30-34% encode time reduction for 1080p, 16 threads, 1x1 tile
configuration (tile_rows x tile_columns)
o 18-28% encode time reduction for 1080p, 16 threads, 2x4 tile
o 18-20% encode time reduction for 2160p, 32 threads, 2x4 tile
* 16-20% speed-up for speed=6 to 8 in still-picture encoding mode
* 5-6% heap memory reduction for speed=6 to 10 in real-time encoding mode
* Improvements to the speed for speed=7, 8 in real-time encoding mode
* Improvements to the speed for speed=9, 10 in real-time screen encoding
* Optimizations to improve multi-thread efficiency in real-time encoding
* 10-15% speed up for SVC with temporal layers
* SIMD optimizations:
o Improve av1_quantize_fp_32x32_neon() 1.05x to 1.24x faster
o Add aom_highbd_quantize_b{,_32x32,_64x64}_adaptive_neon() 3.15x to 5.6x
faster than "C"
o Improve av1_quantize_fp_64x64_neon() 1.17x to 1.66x faster
o Add aom_quantize_b_avx2() 1.4x to 1.7x faster than aom_quantize_b_avx()
o Add aom_quantize_b_32x32_avx2() 1.4x to 2.3x faster than
o Add aom_quantize_b_64x64_avx2() 2.0x to 2.4x faster than
o Add aom_highbd_quantize_b_32x32_avx2() 9.0x to 10.5x faster than
o Add aom_highbd_quantize_b_64x64_avx2() 7.3x to 9.7x faster than
o Improve aom_highbd_quantize_b_avx2() 1.07x to 1.20x faster
o Improve av1_quantize_fp_avx2() 1.13x to 1.49x faster
o Improve av1_quantize_fp_32x32_avx2() 1.07x to 1.54x faster
o Improve av1_quantize_fp_64x64_avx2() 1.03x to 1.25x faster
o Improve av1_quantize_lp_avx2() 1.07x to 1.16x faster
- Bug fixes including but not limited to
* aomedia:3206 Assert that skip_width > 0 for deconvolve function
* aomedia:3278 row_mt enc: Delay top-right sync when intraBC is enabled
* aomedia:3282 blend_a64_*_neon: fix bus error in armv7
* aomedia:3283 FRAME_PARALLEL: Propagate border size to all cpis
* aomedia:3283 RESIZE_MODE: Fix incorrect strides being used for motion
* aomedia:3286 rtc-svc: Fix to dynamic_enable spatial layers
* aomedia:3289 rtc-screen: Fix to skipping inter-mode test in nonrd
* aomedia:3289 rtc-screen: Fix for skip newmv on flat blocks
* aomedia:3299 Fix build failure with CONFIG_TUNE_VMAF=1
* aomedia:3296 Fix the conflict --enable-tx-size-search=0 with nonrd mode
--enable-tx-size-search will be ignored in non-rd pick mode
* aomedia:3304 Fix off-by-one error of max w/h in validate_config
* aomedia:3306 Do not use pthread_setname_np on GNU/Hurd
* aomedia:3325 row-multithreading produces invalid bitstream in some cases
* chromium:1346938, chromium:1338114
* compiler_flags.cmake: fix flag detection w/cmake 3.17-3.18.2
* tools/*.py: update to python3
* aom_configure.cmake: detect PIE and set CONFIG_PIC
* test/simd_cmp_impl: use explicit types w/CompareSimd*
* rtc: Fix to disable segm for aq-mode=3
* rtc: Fix to color_sensitivity in variance partition
* rtc-screen: Fix bsize in model rd computation for intra chroma
* Fixes to ensure the correct behavior of the encoder algorithms (like
segmentation, computation of statistics, etc.)
2022-06-17 v3.4.0
This release includes compression efficiency and perceptual quality
improvements, speedup and memory optimizations, and some new features.
There are no ABI or API breaking changes in this release.
- New Features
* New --dist-metric flag with "qm-psnr" value to use quantization
matrices in the distortion computation for RD search. The default
value is "psnr".
* New command line option "--auto-intra-tools-off=1" to make
all-intra encoding faster for high bit rate under
"--deltaq-mode=3" mode.
* New rate control library aom_av1_rc for real-time hardware
encoders. Supports CBR for both one spatial layer and SVC.
* New image format AOM_IMG_FMT_NV12 can be used as input to the
encoder. The presence of AOM_IMG_FMT_NV12 can be detected at
compile time by checking if the macro AOM_HAVE_IMG_FMT_NV12 is
* New codec controls for the encoder:
o AV1E_SET_AUTO_INTRA_TOOLS_OFF. Only in effect if
o AV1E_SET_FP_MT. Only supported if libaom is built with
* New key-value pairs for the key-value API:
o --auto-intra-tools-off=0 (default) or 1. Only in effect if
o --strict-level-conformance=0 (default) or 1
o --fp-mt=0 (default) or 1. Only supported if libaom is built
* New aomenc options (not supported by the key-value API):
o --nv12
- Compression Efficiency Improvements
* Correctly calculate SSE for high bitdepth in skip mode, 0.2% to
0.6% coding gain.
* RTC at speed 9/10: BD-rate gain of ~4/5%
* RTC screen content coding: many improvements for real-time screen
at speed 10 (quality, speedup, and rate control), up to high
resolutions (1080p).
* RTC-SVC: fixes to make intra-only frames work for spatial layers.
* RTC-SVC: quality improvements for temporal layers.
* AV1 RT: A new passive rate control strategy for screen content, an
average of 7.5% coding gain, with some clips of 20+%. The feature
is turned off by default due to higher bit rate variation.
- Perceptual Quality Improvements
* RTC: Visual quality improvements for high speeds (9/10)
* Improvements in coding quality for all intra mode
- Speedup and Memory Optimizations
* ~10% speedup in good quality mode encoding.
* ~7% heap memory reduction in good quality encoding mode for speed
5 and 6.
* Ongoing improvements to intra-frame encoding performance on Arm
* Faster encoding speed for "--deltaq-mode=3" mode.
* ~10% speedup for speed 5/6, ~15% speedup for speed 7/8, and
~10% speedup for speed 9/10 in real time encoding mode
* ~20% heap memory reduction in still-picture encoding mode for
360p-720p resolutions with multiple threads
* ~13% speedup for speed 6 and ~12% speedup for speed 9 in
still-picture encoding mode.
* Optimizations to improve multi-thread efficiency for still-picture
encoding mode.
- Bug Fixes
* b/204460717: replace master with main
* b/210677928: libaom disable_order is surprising for
* b/222461449: -DCONFIG_TUNE_BUTTERAUGLI=1 broken
* b/227207606: write_greyscale writes incorrect chroma in highbd
* b/229955363: Integer-overflow in linsolve_wiener
2022-01-28 v3.3.0
This release includes compression efficiency and perceptual quality
improvements, speedup and memory optimizations, some new features, and
several bug fixes.
- New Features
* AV1 RT: Introducing CDEF search level 5
* Changed real time speed 4 to behave the same as real time speed 5
* Add --deltaq-strength
* rtc: Allow scene-change and overshoot detection for svc
* rtc: Intra-only frame for svc
* AV1 RT: Option 2 for codec control AV1E_SET_ENABLE_CDEF to disable
CDEF on non-ref frames
* New codec controls AV1E_SET_LOOPFILTER_CONTROL and
* Improvements to three pass encoding
- Compression Efficiency Improvements
* Overall compression gains: 0.6%
- Perceptual Quality Improvements
* Improves the perceptual quality of high QP encoding for delta-q mode 4
* Auto select noise synthesis level for all intra
- Speedup and Memory Optimizations
* Added many SSE2 optimizations.
* Good quality 2-pass encoder speedups:
o Speed 2: 9%
o Speed 3: 12.5%
o Speed 4: 8%
o Speed 5: 3%
o Speed 6: 4%
* Real time mode encoder speedups:
o Speed 5: 2.6% BDRate gain, 4% speedup
o Speed 6: 3.5% BDRate gain, 4% speedup
o Speed 9: 1% BDRate gain, 3% speedup
o Speed 10: 3% BDRate gain, neutral speedup
* All intra encoding speedups (AVIF):
o Single thread - speed 6: 8%
o Single thread - speed 9: 15%
o Multi thread(8) - speed 6: 14%
o Multi thread(8) - speed 9: 34%
- Bug Fixes
* Issue 3163: Segmentation fault when using --enable-keyframe-filtering=2
* Issue 2436: Integer overflow in av1_warp_affine_c()
* Issue 3226: armv7 build failure due to gcc-11
* Issue 3195: Bug report on libaom (AddressSanitizer: heap-buffer-overflow)
* Issue 3191: Bug report on libaom (AddressSanitizer: SEGV on unknown
* Issue 3176: Some SSE2/SADx4AvgTest.* tests fail on Windows
* Issue 3175: Some SSE2/SADSkipTest.* tests fail on Windows
2021-10-13 v3.2.0
This release includes compression efficiency and perceptual quality
improvements, speedup and memory optimizations, as well as some new
- New Features
* Introduced speeds 7, 8, and 9 for all intra mode.
* Introduced speed 10 for real time mode.
* Introduced an API that allows external partition decisions.
* SVC: added support for compound prediction.
* SVC: added support for fixed SVC modes.
- Compression Efficiency Improvements
* Intra-mode search improvement.
* Improved real time (RT) mode BDrate savings by ~5% (RT speed 5)
and ~12% (RT speed 6). The improvement was measured on the video
conference set.
* Improved real time mode for nonrd path (speed 7, 8, 9): BDrate
gains of ~3-5%.
* Rate control and RD adjustments based on ML research in VP9.
Gains of ~0.5-1.0% for HD.
- Perceptual Quality Improvements
* Added a new mode --deltaq-mode=3 to improve perceptual quality
based on a differential contrast model for still images.
* Added a new mode --deltaq-mode=4 to improve perceptual quality
based on user rated cq_level data set for still images.
* Weighting of some intra mode and partition size choices to better
manage and retain texture.
- Speedup and Memory Optimizations
* Further improved 2-pass good quality encoder speed:
o Speed 2 speedup: 18%
o Speed 3 speedup: 22%
o Speed 4 speedup: 37%
o Speed 5 speedup: 30%
o Speed 6 speedup: 20%
* Optimized the real time encoder (measured on the video conference
o RT speed 5 speedup: 110%
o RT speed 6 speedup: 77%
- Bug Fixes
* Issue 3069: Fix one-pass mode keyframe placement off-by-one error.
* Issue 3156: Fix a bug in av1_quantize_lp AVX2 optimization.
2021-09-29 v3.1.3
This release includes several bug fixes.
- Bug fixes:
The following four cmake changes should help the people building
libaom using MSVC.
1. exports: use CMAKE_SHARED_LIBRARY_PREFIX to determine lib name
2. aom_install: Install lib dlls to bindir
3. aom_install: use relpath for install
4. aom_install: don't exclude msvc from install
aom/aom_encoder.h: remove configure option reference
Issue 3113: Tests for detecting chroma subsampling in
av1_copy_and_extend_frame() do not work when y_width or y_height is
Issue 3115: image2yuvconfig() should calculate uv_crop_width and
uv_crop_height from y_crop_width and y_crop_height
Issue 3140: rc_overshoot_pct is documented as having a range of
0-1000, but is range checked against 0-100
Issue 3147: Build failure on Apple M1 arm64
2021-07-20 v3.1.2
This release includes several bug fixes.
- Bug fixes:
exports.cmake: use APPLE and WIN32 and use def for mingw-w64
Issue 2993: Incorrect spatial_id when decoding base layer of
multi-layer stream
Issue 3080: Chroma Resampling by Encoder on Y4M Inputs Files Tagged
as C420mpeg2
Issue 3081: Use of uninitialized value $version_extra in
concatenation (.) or string at aom/build/cmake/ line 88.
2021-06-08 v3.1.1
This release includes several bug fixes.
- Bug fixes:
Issue 2965: Cherry-picked the following four commits for the
tune=butteraugli mode.
1. Add libjxl to pkg_config if enabled:
2. Declare set_mb_butteraugli_rdmult_scaling static:
3. Add color range detection in tune=butteraugli mode:
4. Enable tune=butteraugli in all-intra mode:
Issue 3021: Fix vmaf model initialization error when not set to
Issue 3050: Compilation fails with -DCONFIG_TUNE_VMAF=1
Issue 3054: Consistent crash on near-static screen content, keyframe
2021-05-03 v3.1.0
This release adds an "all intra" mode to the encoder, which significantly
speeds up the encoding of AVIF still images at speed 6.
- Upgrading:
All intra mode for encoding AVIF still images and AV1 all intra videos:
AOM_USAGE_ALL_INTRA (2) can be passed as the 'usage' argument to
New encoder control IDs added:
- AV1E_SET_ENABLE_DIAGONAL_INTRA: Enable diagonal (D45 to D203) intra
prediction modes (0: false, 1: true (default)). Also available as
"enable-diagonal-intra" for the aom_codec_set_option() function.
New aom_tune_metric enum value: AOM_TUNE_BUTTERAUGLI. The new aomenc option
--tune=butteraugli was added to optimize the encoder's perceptual quality by
optimizing the Butteraugli metric. Install libjxl (JPEG XL) and then pass
-DCONFIG_TUNE_BUTTERAUGLI=1 to the cmake command to enable it.
Addition of support for libvmaf 2.x.
- Enhancements:
Heap memory consumption for encoding AVIF still images is significantly
- Bug fixes:
Issue 2601: third_party/libaom fails licensecheck
Issue 2950: Conditional expression for rc->this_key_frame_forced is always
true in find_next_key_frame()
Issue 2988: "make install" installs the aom.h header twice
Issue 2992: Incorrectly printing the temporal_id twice in dump_obu tool
Issue 2998:
Issue 2999:
Issue 3000:
2021-02-24 v3.0.0
This release includes compression efficiency improvement, speed improvement
for realtime mode, as well as some new APIs.
- Upgrading:
Support for PSNR calculation based on stream bit-depth.
New encoder control IDs added:
New decoder control IDs added:
New aom_tune_content enum value: AOM_CONTENT_FILM
New aom_tune_metric enum value: AOM_TUNE_VMAF_NEG_MAX_GAIN
Coefficient and mode update can be turned off via
New key & value API added, available with aom_codec_set_option() function.
Scaling API expanded to include 1/4, 3/4 and 1/8.
- Enhancements:
Better multithreading performance with realtime mode.
New speed 9 setting for faster realtime encoding.
Smaller binary size with low bitdepth and realtime only build.
Temporal denoiser and its optimizations on x86 and Neon.
Optimizations for scaling.
Faster encoding with speed settings 2 to 6 for good encoding mode.
Improved documentation throughout the library, with function level
documentation, tree view and support for the dot tool.
- Bug fixes:
Aside from those mentioned in v2.0.1 and v2.0.2, this release includes the
following bug fixes:
Issue 2940: Segfault when encoding with --use-16bit-internal and --limit > 1
Issue 2941: Decoder mismatch with --rt --bit-depth=10 and --cpu-used=8
Issue 2895: mingw-w64 i686 gcc fails to build
Issue 2874: Separate ssse3 functions from sse2 file.
2021-02-09 v2.0.2
This release includes several bug fixes.
- Bug fixes:
Issue 2643: Modify the assertion in temporal filter intrinsics.
Issue 2648: Fix unit test ThreadTestLarge.EncoderResultTest/49
assertion failure.
Issue 2869: Add -Wimplicit-function-declaration as C flag only.
Issue 2878: Avoid memset in the av1_filter_intra_predictor module
Issue 2903: Fix a typo bug in apply_temporal_filter_planewise.
Call av1_setup_frame_size() when dropping a frame in the
encode_frame_to_data_rate() function in av1/encoder/encoder.c.
2020-11-25 v2.0.1
This release includes two bug fixes.
- Bug fixes:
Issue 2723: Fix crash in chroma_check() when generating a monochrome
encoded stream in real-time mode.
Issue 2833: Fix crash on some input when reduced still picture header is
used in real-time mode and speed >=7.
2020-05-07 v2.0.0 "Applejack"
First official release of libaom.
This release includes new real-time mode and SVC support.
- Upgrading:
AOM_SET_DBG_* is removed.
Multi-resolution encoding is removed.
put_frame and put_slice callbacks are removed.
- Enhancements:
Full-sweep document update for codec controls.
2018-06-28 v1.0.0
AOMedia Codec Workgroup Approved version 1.0
2016-04-07 v0.1.0 "AOMedia Codec 1"
This release is the first Alliance for Open Media codec.