2 This release includes compression efficiency and perceptual quality
3 improvements, speedup and memory optimizations, as well as some new
7 * Introduced speeds 7, 8, and 9 for all intra mode.
8 * Introduced speed 10 for real time mode.
9 * Introduced an API that allows external partition decisions.
10 * SVC: added support for compound prediction.
11 * SVC: added support for fixed SVC modes.
13 - Compression Efficiency Improvements
14 * Intra-mode search improvement.
15 * Improved real time (RT) mode BDrate savings by ~5% (RT speed 5)
16 and ~12% (RT speed 6). The improvement was measured on the video
18 * Improved real time mode for nonrd path (speed 7, 8, 9): BDrate
20 * Rate control and RD adjustments based on ML research in VP9.
21 Gains of ~0.5-1.0% for HD.
23 - Perceptual Quality Improvements
24 * Added a new mode --deltaq-mode=3 to improve perceptual quality
25 based on a differential contrast model for still images.
26 * Added a new mode –deltaq-mode=4 to improve perceptual quality
27 based on user rated cq_level data set for still images.
28 * Weighting of some intra mode and partition size choices to better
29 manage and retain texture.
31 - Speedup and Memory Optimizations
32 * Further improved 2-pass good quality encoder speed:
33 o Speed 2 speedup: 18%
34 o Speed 3 speedup: 22%
35 o Speed 4 speedup: 37%
36 o Speed 5 speedup: 30%
37 o Speed 6 speedup: 20%
38 * Optimized the real time encoder (measured on the video conference
40 o RT speed 5 speedup: 110%
41 o RT speed 6 speedup: 77%
44 * Issue 3069: Fix one-pass mode keyframe placement off-by-one error.
45 * Issue 3156: Fix a bug in av1_quantize_lp AVX2 optimization.
48 This release includes several bug fixes.
51 The following four cmake changes should help the people building
53 1. exports: use CMAKE_SHARED_LIBRARY_PREFIX to determine lib name
54 https://aomedia-review.googlesource.com/c/aom/+/142342
55 2. aom_install: Install lib dlls to bindir
56 https://aomedia-review.googlesource.com/c/aom/+/146546
57 3. aom_install: use relpath for install
58 https://aomedia-review.googlesource.com/c/aom/+/146550
59 4. aom_install: don't exclude msvc from install
60 https://aomedia-review.googlesource.com/c/aom/+/146547
62 aom/aom_encoder.h: remove configure option reference
63 https://aomedia-review.googlesource.com/c/aom/+/146743
65 Issue 3113: Tests for detecting chroma subsampling in
66 av1_copy_and_extend_frame() do not work when y_width or y_height is
69 Issue 3115: image2yuvconfig() should calculate uv_crop_width and
70 uv_crop_height from y_crop_width and y_crop_height
72 Issue 3140: rc_overshoot_pct is documented as having a range of
73 0-1000, but is range checked against 0-100
75 Issue 3147: Build failure on Apple M1 arm64
78 This release includes several bug fixes.
81 exports.cmake: use APPLE and WIN32 and use def for mingw-w64
82 https://aomedia-review.googlesource.com/c/aom/+/139882
84 Issue 2993: Incorrect spatial_id when decoding base layer of
87 Issue 3080: Chroma Resampling by Encoder on Y4M Inputs Files Tagged
90 Issue 3081: Use of uninitialized value $version_extra in
91 concatenation (.) or string at aom/build/cmake/version.pl line 88.
94 This release includes several bug fixes.
97 Issue 2965: Cherry-picked the following four commits for the
98 tune=butteraugli mode.
99 1. Add libjxl to pkg_config if enabled:
100 https://aomedia-review.googlesource.com/c/aom/+/136044
101 2. Declare set_mb_butteraugli_rdmult_scaling static:
102 https://aomedia-review.googlesource.com/c/aom/+/134506
103 3. Add color range detection in tune=butteraugli mode:
104 https://aomedia-review.googlesource.com/c/aom/+/135521
105 4. Enable tune=butteraugli in all-intra mode:
106 https://aomedia-review.googlesource.com/c/aom/+/136082
108 Issue 3021: Fix vmaf model initialization error when not set to
111 Issue 3050: Compilation fails with -DCONFIG_TUNE_VMAF=1
113 Issue 3054: Consistent crash on near-static screen content, keyframe
117 This release adds an "all intra" mode to the encoder, which significantly
118 speeds up the encoding of AVIF still images at speed 6.
121 All intra mode for encoding AVIF still images and AV1 all intra videos:
122 AOM_USAGE_ALL_INTRA (2) can be passed as the 'usage' argument to
123 aom_codec_enc_config_default().
125 New encoder control IDs added:
126 - AV1E_SET_ENABLE_DIAGONAL_INTRA: Enable diagonal (D45 to D203) intra
127 prediction modes (0: false, 1: true (default)). Also available as
128 "enable-diagonal-intra" for the aom_codec_set_option() function.
130 New aom_tune_metric enum value: AOM_TUNE_BUTTERAUGLI. The new aomenc option
131 --tune=butteraugli was added to optimize the encoder’s perceptual quality by
132 optimizing the Butteraugli metric. Install libjxl (JPEG XL) and then pass
133 -DCONFIG_TUNE_BUTTERAUGLI=1 to the cmake command to enable it.
135 Addition of support for libvmaf 2.x.
138 Heap memory consumption for encoding AVIF still images is significantly
142 Issue 2601: third_party/libaom fails licensecheck
144 Issue 2950: Conditional expression for rc->this_key_frame_forced is always
145 true in find_next_key_frame()
147 Issue 2988: "make install" installs the aom.h header twice
149 Issue 2992: Incorrectly printing the temporal_id twice in dump_obu tool
158 This release includes compression efficiency improvement, speed improvement
159 for realtime mode, as well as some new APIs.
162 Support for PSNR calculation based on stream bit-depth.
164 New encoder control IDs added:
165 - AV1E_SET_ENABLE_RECT_TX
166 - AV1E_SET_VBR_CORPUS_COMPLEXITY_LAP
167 - AV1E_GET_BASELINE_GF_INTERVAL
168 - AV1E_SET_ENABLE_DNL_DENOISING
170 New decoder control IDs added:
171 - AOMD_GET_FWD_KF_PRESENT
172 - AOMD_GET_FRAME_FLAGS
173 - AOMD_GET_ALTREF_PRESENT
175 - AOMD_GET_SCREEN_CONTENT_TOOLS_INFO
176 - AOMD_GET_STILL_PICTURE
178 - AOMD_GET_SHOW_EXISTING_FRAME_FLAG
179 - AOMD_GET_S_FRAME_INFO
181 New aom_tune_content enum value: AOM_CONTENT_FILM
183 New aom_tune_metric enum value: AOM_TUNE_VMAF_NEG_MAX_GAIN
185 Coefficient and mode update can be turned off via
186 AV1E_SET_{COEFF/MODE}_COST_UPD_FREQ.
188 New key & value API added, available with aom_codec_set_option() function.
190 Scaling API expanded to include 1/4, 3/4 and 1/8.
193 Better multithreading performance with realtime mode.
195 New speed 9 setting for faster realtime encoding.
197 Smaller binary size with low bitdepth and realtime only build.
199 Temporal denoiser and its optimizations on x86 and Neon.
201 Optimizations for scaling.
203 Faster encoding with speed settings 2 to 6 for good encoding mode.
205 Improved documentation throughout the library, with function level
206 documentation, tree view and support for the dot tool.
209 Aside from those mentioned in v2.0.1 and v2.0.2, this release includes the
212 Issue 2940: Segfault when encoding with --use-16bit-internal and --limit > 1
214 Issue 2941: Decoder mismatch with --rt --bit-depth=10 and --cpu-used=8
216 Issue 2895: mingw-w64 i686 gcc fails to build
218 Issue 2874: Separate ssse3 functions from sse2 file.
221 This release includes several bug fixes.
224 Issue 2643: Modify the assertion in temporal filter intrinsics.
226 Issue 2648: Fix unit test ThreadTestLarge.EncoderResultTest/49
229 Issue 2869: Add -Wimplicit-function-declaration as C flag only.
231 Issue 2878: Avoid memset in the av1_filter_intra_predictor module
234 Issue 2903: Fix a typo bug in apply_temporal_filter_planewise.
236 Call av1_setup_frame_size() when dropping a frame in the
237 encode_frame_to_data_rate() function in av1/encoder/encoder.c.
240 This release includes two bug fixes.
243 Issue 2723: Fix crash in chroma_check() when generating a monochrome
244 encoded stream in real-time mode.
246 Issue 2833: Fix crash on some input when reduced still picture header is
247 used in real-time mode and speed >=7.
249 2020-05-07 v2.0.0 "Applejack"
250 First official release of libaom.
251 This release includes new real-time mode and SVC support.
254 AOM_SET_POSTPROC, AOM_CODEC_CAP_POSTPROC and AOM_CODEC_USE_POSTPROC are
257 AOM_SET_DBG_* is removed.
259 Multi-resolution encoding is removed.
261 put_frame and put_slice callbacks are removed.
264 Full-sweep document update for codec controls.
267 AOMedia Codec Workgroup Approved version 1.0
269 2016-04-07 v0.1.0 "AOMedia Codec 1"
270 This release is the first Alliance for Open Media codec.