2026-10-20 v3.15.3
  This release is ABI compatible with the last release. See
  https://aomedia.googlesource.com/aom/+log/v3.15.2..v3.15.3 for all the
  commits in this release.

  - Bug Fixes
    * Bug oss-fuzz:572842743: Integer-overflow in
      av1_choose_var_based_partitioning.

2026-10-06 v3.15.2
  This release is ABI compatible with the last release. See
  https://aomedia.googlesource.com/aom/+log/v3.15.1..v3.15.2 for all the
  commits in this release.

  - Bug Fixes
    * Bug 42302352: A larger frame is forced to be a key frame.
    * Bug 555350218: libaom encoder allows frame width/height to be
      different from max frame width/height when
      reduced_still_picture_header is 1.
    * Bug oss-fuzz:559019046: libaom:av1_enc_fuzzer: Bad-cast to
      PixelLevelGradientInfocompute_gradient_info_sb in
      av1_encode_sb_row.
    * Bug oss-fuzz:566951534: Integer-overflow in linsolve_wiener.
    * Bug 568044446: Fix stale search_site_config in IntraBC motion
      search. Fix y_stride_src in init_motion_estimation().

2026-09-21 v3.15.1
  This release is ABI compatible with the last release. See
  https://aomedia.googlesource.com/aom/+log/v3.15.0..v3.15.1 for all the
  commits in this release.

  - Bug Fixes
    * b:558679217: Tune VMAF mode regression

2026-08-25 v3.15.0
  This release is ABI compatible with the last release.

  This release includes the fixes for all the security issues found by
  AI tools recently.

  Important build system change: The cmake option ENABLE_APPS was added
  to build aomdec and aomenc without building the example programs. The
  cmake option ENABLE_EXAMPLES was redefined to build only the example
  programs.

  - New Features
    * Test only: New codec control AV1E_SET_MODE_REF_DELTA_ENABLED for
      the encoder to toggle loopfilter mode_ref_delta_enabled.
    * New codec option “force-max-q” for the encoder to force the use
      of max Q in VBR mode.
    * Completed low-complexity decode mode development for VOD video,
      and supported HDres (i.e. 720p to 1080p) encoding.
    * IntraBC for RTC screen: improvements to allow and speed up this
      tool for realtime mode.

  - Compression Efficiency Improvements
    * Improved the rate allocation among hierarchical layers and luma
      and chroma planes.

  - Perceptual Quality Improvements
    * Improved VMAF metric while maintaining PSNR performance.

  - Speedups
    * Continued the speed 0 to 3 encoder speed optimizations.
    * Improvements to Arm optimizations for convolve and variance
      functions.

  - Bug Fixes
    * Bug 541725398: aom_img_flip: fix chroma height calculation
    * Bug 437872594: CONFIG_SHARED=1 produces an .a(rchive) file for
      static linking
    * Bug 503326506: SEGV in encoder_destroy via failed encoder
      initialization
    * Bug 538651949: Bounds-check bypass in AV1E_SET_SVC_LAYER_ID:
      ppi/svc layer-count desync re-enables OOB layer_context[]
      read/write (incomplete fix for issue 503993985 / CVE-2026-56209)
    * Bug 525452409: The math and Threads::Threads library dependencies
      should not be part of the link interface of the aom shared library
    * Bug 524353636: AOM_EXTRA_C_FLAGS/-DSANITIZE= flags not propagated
      w/CMAKE_BUILD_TYPE=Debug
    * Bug 513342555: Potential heap double-free in libaom AV1 MT
      encoding via aliased macroblock data
    * Bug 520656240: Copy on write: libaom AV1 wedge/interintra mask
      buffers could be precomputed
    * Bug 514696186: aomdec fails with "Failed to decode tile data" on
      stream encoded by aomenc
    * Bug 382465458: Chessboard pattern on flat gray video encoded with
      libaom AV1
    * oss-fuzz:514006304: Increase ctx->cx_data_sz to 2.5x uncomp frame
      size
    * Bug 514816767: aomenc fails assertion check mi->bsize == bsize
    * Bug 504613867: Potential heap OOB read in
      av1_int_pro_motion_estimation due to stale stride (CVE-2026-13906)
    * Bug 503810640: Undefined behavior: NaN-to-int conversion in
      aom_noise_model_get_grain_parameters
    * Bug 503171639: Heap-buffer-overflow in
      av1_update_and_record_txb_context via SVC encoding with mismatched
      TXB buffer size
    * Bug 505976409: SIGFPE (integer divide-by-zero) in libaom AV1 SVC
      encoder

2026-05-22 v3.14.1
  This release is ABI compatible with the last release. See
  https://aomedia.googlesource.com/aom/+log/v3.14.0..v3.14.1 for all the
  commits in this release.

  - Bug Fixes
    * b:513603812: NULL Pointer Dereference in validate_img
      (av1_cx_iface.c) with 10-bit monochrome input
    * oss-fuzz:514006304: Increase ctx->cx_data_sz to 2.5x uncomp frame
      size

2026-05-12 v3.14.0
  This release is ABI compatible with the last release.

  This release includes significant compression efficiency and
  perceptual quality improvements for layered image encoding, in
  addition to bug fixes.

  The `build` directory in the source tree was removed and the original
  build/cmake directory was moved up one level. If you use the CMake
  toolchain files in the original build/cmake/toolchains directory,
  they are now in the cmake/toolchains directory.

  The unsupported aom_img_fmt_t enum constants AOM_IMG_FMT_AOMYV12 and
  AOM_IMG_FMT_AOMI420 are deprecated and will be removed in a future
  release. Do not use them.

  The new codec controls AV1E_SET_EXTERNAL_RATE_CONTROL (including the
  new aom_rc_funcs_t struct and the new "aom/aom_ext_ratectrl.h" and
  "aom/aom_tpl.h" headers) and AV1E_GET_GOP_INFO (including the new
  aom_gop_info_t struct) have the experimental API status and are NOT
  part of the stable API. Applications that need the backward
  compatibility of the stable API must not use
  AV1E_SET_EXTERNAL_RATE_CONTROL and AV1E_GET_GOP_INFO.

  - New Features
    * Tuning modes AOM_TUNE_IQ and AOM_TUNE_SSIMULACRA2 now work with
      inter-frame encoding modes (good-quality and realtime), enabling
      efficient layered image encoding.
    * Variance Boost (deltaq-mode 6) support has been extended to
      include good-quality and realtime modes.
    * New value 2 for use_fixed_qp_offsets: disallow the application of
      per-frame QP offsets, enabling full control of each frame's QP, by
      adjusting rc_cfg.cq_level between each encoded frame.
    * Low complexity decode mode (the encoder optimizations that produce
      encoded bitstreams that can be decoded at low computational
      complexity) now supports good-quality encoding (speed 1 to 3) for
      not only vertical videos (608p to 1080p) but also horizontal
      videos (720p to 1080p).
    * Realtime encoding with non-zero lookahead is supported, for
      !REALTME_ONLY_CONFIG.
    * New AOM_EFLAG_FREEZE_INTERNAL_STATE flag for aom_codec_encode() to
      encode a frame without updating encoder state such as reference
      buffers, CDF tables, and rate control state. Useful for
      speculative encoding.
    * New aom_matrix_coefficients_t enum constants:
      - AOM_CICP_MC_IPT_C2 (15): IPT-C2
      - AOM_CICP_MC_YCGCO_RE (16): YCgCo-Re
      - AOM_CICP_MC_YCGCO_RO (17): YCgCo-Ro
    * New aom_metadata_insert_flags_t enum constants for adding
      layer-specific metadata OBUs:
      - AOM_MIF_NON_KEY_FRAME_LAYER_SPECIFIC: Adds layer-specific
        metadata if it's not a keyframe
      - AOM_MIF_KEY_FRAME_LAYER_SPECIFIC: Adds layer-specific metadata
        only if it's a keyframe
      - AOM_MIF_ANY_FRAME_LAYER_SPECIFIC: Adds layer-specific metadata
        to any type of frame
    * Experimental: New codec control AV1E_SET_EXTERNAL_RATE_CONTROL to
      enable an external rate control library. Not part of the stable
      API.
    * Experimental: New codec control AV1E_GET_GOP_INFO to get the GOP
      structure from the encoder. Not part of the stable API.
    * New codec control AOME_SET_VALIDATE_HBD_INPUT to validate high
      bitdepth (HBD) input and ensure that every pixel is within the
      valid range. The corresponding option for aom_codec_set_option()
      is "validate-hbd-input".
    * New codec control AOMD_SET_FRAME_SIZE_LIMIT to set the maximum
      frame size for a decoder

  - Compression Efficiency Improvements
    * When encoding 2-layered images with AOM_TUNE_IQ vs. AOM_TUNE_SSIM:
      - Good-quality mode: up to 15% gains at similar SSIMULACRA 2
        scores.
      - Realtime mode: up to 30% gains at similar SSIMULACRA 2 scores.
    * Enable screen detection mode 2 (anti-aliased text and graphics
      aware) in all-intra mode.
    * Some minor quantization matrix formula and delta chroma q tweaks
      for the AOM_TUNE_SSIMULACRA2 tuning mode, with up to 0.2%
      SSIMULACRA 2 score efficiency gains.
    * Re-tune and re-work encoder features, achieving coding gains at
      each speed level and better coding efficiency vs complexity
      tradeoff (an estimated 20-30% encoder time reduction with about
      1-5% vmaf gains).
    * RTC screen: improvements to quality and scroll detection for high
      resolutions.

  - Perceptual Quality Improvements
    * AOM_TUNE_IQ improves the visual quality of layered image encoding
      compared to AOM_TUNE_SSIM.
    * Adaptive sharpness: tweak loop filter sharpness threshold to
      improve visual quality at QPs 29 and 30.
    * Improve encoder algorithms in loop restoration, CDEF, temporal
      filter and rate control, delivering better visual quality.

  - Speedups
    * Make Adaptive CDEF more decoder friendly by limiting CDEF
      application to only regions where high filter strengths are
      needed.
    * Encoder complexity is reduced significantly, especially at speed
      1 to 3.
    * Further AArch64 SIMD optimization of filtering algorithms,
      parti                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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