2025-05-28 v1.15.2 "Wigeon Duck"

This release fixes CVE-2025-5283 (bug webm:413411335), and is ABI compatible

with the previous release.

2025-01-09 v1.15.1 "Wigeon Duck"

This release bumps up the SO major version and fixes the language about ABI

compatibility in the previous release changelog.

2024-10-22 v1.15.0 "Wigeon Duck"

This release includes new codec control for key frame filtering, more Neon

optimizations, improvements to RTC encoding and bug fixes.

- Upgrading:

This release is ABI incompatible with the previous release.

It is strongly recommended to skip this release and upgrade to v1.15.1 since

the shared object was versioned incorrectly, as shown in

https://issues.webmproject.org/issues/384672478.

Temporal filtering improvement that can be turned on with the new codec

control VP9E_SET_KEY_FRAME_FILTERING, which gives 1+% BD-rate saving with

minimal encoder time increase.

libwebm is upgraded to libwebm-1.0.0.31-10-g3b63004

- Enhancement:

Neon optimization speed up

1-3% speed up across speed 5 to 10 for RTC

3% speed up for speed 0 and 1 for VoD in standard bitdepth

3% and 7% speed up for speed 0 and 1 respectively for VoD in high bitdepth

Scene detection is allowed for all RTC speeds (>=5)

Support profile guided optimizations

Delta quantization parameters for UV channels for vp8 is supported in RTC

rate control library

Rate control parameters are reset and maximum QP is enforced on scene

changes in SVC when there is no inter-layer prediction

- Bug fixes:

Fix to Uninitialized scalar variable in `vp9_rd_pick_inter_mode_sb()`

Fix to Integer-overflow in `resize_multistep`

Fix to Heap-buffer-overflow in `vpx_sad64x64_avx2`

Fix to Crash in `vpx_sad8x8_sse2`

Fix to Assertion in `write_modes`

Support profile guided optimizations

Fix to Integer-overflow in `encode_frame_to_data_rate`

Fix to Integer-overflow in `vp9_svc_check_reset_layer_rc_flag`

Fix to core dump error from /usr/bin/tools/tiny_ssim --help

Fix to use-of-uninitialized-value in `vp9_setup_tpl_stats`

Fix to Undefined-shift in `vp9_cyclic_refresh_setup`

Fix to redundant `&& __GNUC__` preproc check

Fix to valgrind warning in EncodeAPI.OssFuzz69906

Fix to Index-out-of-bounds in `vp8_rd_pick_inter_mode`

Fix to Integer-overflow in `vp8_pick_frame_size`

Fix to Use-of-uninitialized-value in `vpx_codec_peek_stream_info`

Fix to log clutters with the message "Warning: Desired height too large"

Fix to Integer-overflow in `vp9_svc_adjust_avg_frame_qindex`

Fix to integer overflows caused by huge target bitrate, frame rate, or

g_timebase numerator or denominator

Fix to missing license headers

Fix to build failure for Android Armv7

Fix to integer overflows in image helpers

Fix to Integer-overflow in `vp9_calc_iframe_target_size_one_pass_cbr`

Fix to Heap-buffer-overflow in `vp9_pick_inter_mode`

Fix to Segv in `vp9_multi_thread_tile_init`

Fix to Use-of-uninitialized-value in `vp9_row_mt_sync_mem_dealloc`

Fix to Crash in `mbloop_filter_vertical_edge_c`

Fix to Check failed in CheckUnwind

Fix to Heap-buffer-overflow in `write_modes_b` and `vpx_write`

Fix to Possible signed integer overflow found in `vpx_codec_encode`

Fix to build conflicts between Abseil and libaom/libvpx in Win ARM64 builds

Fix to build failures on aarch64

Fix to Data race in libvpx ARM NEON

Fix to Heap-buffer-overflow in `scale_plane_1_to_2_phase_0`

Fix to integer overflow in `encode_mb_row`

Fix to Floating-point-exception in `vp8_pick_frame_size`

Fix to Heap-buffer-overflow in `vp9_enc_setup_mi`

Fix to build failure with --target=arm64-win64-vs17

Fix to heap-buffer-overflow write in `vpx_img_read()`

Fix to C vs armv8-linux-gcc encode mismatches for `y4m_360p_10bit_input`

Fix to Null-dereference READ in `ml_predict_var_rd_partitioning`

Fix to Heap-buffer-overflow in `vpx_scaled_2d_ssse3`

Fix to Crash in `convolve_horiz`

Fix to Ill in `vpx_scaled_2d_ssse3`

Fix to Global-buffer-overflow in `cost_coeffs`

2024-05-21 v1.14.1 "Venetian Duck"

This release includes enhancements and bug fixes.

- Upgrading:

This release is ABI compatible with the previous release.

- Enhancement:

Improved the detection of compiler support for AArch64 extensions,

particularly SVE.

Added vpx_codec_get_global_headers() support for VP9.

- Bug fixes:

Added buffer bounds checks to vpx_writer and vpx_write_bit_buffer.

Fix to GetSegmentationData() crash in aq_mode=0 for RTC rate control.

Fix to alloc for row_base_thresh_freq_fac.

Free row mt memory before freeing cpi->tile_data.

Fix to buffer alloc for vp9_bitstream_worker_data.

Fix to VP8 race issue for multi-thread with pnsr_calc.

Fix to uv width/height in vp9_scale_and_extend_frame_ssse3.

Fix to integer division by zero and overflow in calc_pframe_target_size().

Fix to integer overflow in vpx_img_alloc() & vpx_img_wrap()(CVE-2024-5197).

Fix to UBSan error in vp9_rc_update_framerate().

Fix to UBSan errors in vp8_new_framerate().

Fix to integer overflow in vp8 encodeframe.c.

Handle EINTR from sem_wait().

2024-01-02 v1.14.0 "Venetian Duck"

This release drops support for old C compilers, such as Visual Studio 2012

and older, that disallow mixing variable declarations and statements (a C99

feature). It adds support for run-time CPU feature detection for Arm

platforms, as well as support for darwin23 (macOS 14).

- Upgrading:

This release is ABI incompatible with the previous release.

Various new features for rate control library for real-time: SVC parallel

encoding, loopfilter level, support for frame dropping, and screen content.

New callback function send_tpl_gop_stats for vp9 external rate control

library, which can be used to transmit TPL stats for a group of pictures. A

public header vpx_tpl.h is added for the definition of TPL stats used in

this callback.

libwebm is upgraded to libwebm-1.0.0.29-9-g1930e3c.

- Enhancement:

Improvements on Neon optimizations: VoD: 12-35% speed up for bitdepth 8,

68%-151% speed up for high bitdepth.

Improvements on AVX2 and SSE optimizations.

Improvements on LSX optimizations for LoongArch.

42-49% speedup on speed 0 VoD encoding.

Android API level predicates.

- Bug fixes:

Fix to missing prototypes from the rtcd header.

Fix to segfault when total size is enlarged but width is smaller.

Fix to the build for arm64ec using MSVC.

Fix to copy BLOCK_8X8's mi to PICK_MODE_CONTEXT::mic.

Fix to -Wshadow warnings.

Fix to heap overflow in vpx_get4x4sse_cs_neon.

Fix to buffer overrun in highbd Neon subpel variance filters.

Added bitexact encode test script.

Fix to -Wl,-z,defs with Clang's sanitizers.

Fix to decoder stability after error & continued decoding.

Fix to mismatch of VP9 encode with NEON intrinsics with C only version.

Fix to Arm64 MSVC compile vpx_highbd_fdct4x4_neon.

Fix to fragments count before use.

Fix to a case where target bandwidth is 0 for SVC.

Fix mask in vp9_quantize_avx2,highbd_get_max_lane_eob.

Fix to int overflow in vp9_calc_pframe_target_size_one_pass_cbr.

Fix to integer overflow in vp8,ratectrl.c.

Fix to integer overflow in vp9 svc.

Fix to avg_frame_bandwidth overflow.

Fix to per frame qp for temporal layers.

Fix to unsigned integer overflow in sse computation.

Fix to uninitialized mesh feature for BEST mode.

Fix to overflow in highbd temporal_filter.

Fix to unaligned loads w/w==4 in vpx_convolve_copy_neon.

Skip arm64_neon.h workaround w/VS >= 2019.

Fix to c vs avx mismatch of diamond_search_sad().

Fix to c vs intrinsic mismatch of vpx_hadamard_32x32() function.

Fix to a bug in vpx_hadamard_32x32_neon().

Fix to Clang -Wunreachable-code-aggressive warnings.

Fix to a bug in vpx_highbd_hadamard_32x32_neon().

Fix to -Wunreachable-code in mfqe_partition.

Force mode search on 64x64 if no mode is selected.

Fix to ubsan failure caused by left shift of negative.

Fix to integer overflow in calc_pframe_target_size.

Fix to float-cast-overflow in vp8_change_config().

Fix to a null ptr before use.

Conditionally skip using inter frames in speed features.

Remove invalid reference frames.

Disable intra mode search speed features conditionally.

Set nonrd keyframe under dynamic change of deadline for rtc.

Fix to scaled reference offsets.

Set skip_recode=0 in nonrd_pick_sb_modes.

Fix to an edge case when downsizing to one.

Fix to a bug in frame scaling.

Fix to pred buffer stride.

Fix to a bug in simple motion search.

Update frame size in actual encoding.

2023-09-29 v1.13.1 "Ugly Duckling"

This release contains two security related fixes. One each for VP8 and VP9.

- Upgrading:

This release is ABI compatible with the previous release.

- Bug fixes:

https://crbug.com/1486441 (CVE-2023-5217)

Fix to a crash related to VP9 encoding (#1642, CVE-2023-6349)

2023-01-31 v1.13.0 "Ugly Duckling"

This release includes more Neon and AVX2 optimizations, adds a new codec

control to set per frame QP, upgrades GoogleTest to v1.12.1, and includes

numerous bug fixes.

- Upgrading:

This release is ABI incompatible with the previous release.

New codec control VP9E_SET_QUANTIZER_ONE_PASS to set per frame QP.

GoogleTest is upgraded to v1.12.1.

.clang-format is upgraded to clang-format-11.

VPX_EXT_RATECTRL_ABI_VERSION was bumped due to incompatible changes to the

feature of using external rate control models for vp9.

- Enhancement:

Numerous improvements on Neon optimizations.

Numerous improvements on AVX2 optimizations.

Additional ARM targets added for Visual Studio.

- Bug fixes:

Fix to calculating internal stats when frame dropped.

Fix to segfault for external resize test in vp9.

Fix to build system with replacing egrep with grep -E.

Fix to a few bugs with external RTC rate control library.

Fix to make SVC work with VBR.

Fix to key frame setting in VP9 external RC.

Fix to -Wimplicit-int (Clang 16).

Fix to VP8 external RC for buffer levels.

Fix to VP8 external RC for dynamic update of layers.

Fix to VP9 auto level.

Fix to off-by-one error of max w/h in validate_config.

Fix to make SVC work for Profile 1.

2022-06-17 v1.12.0 "Torrent Duck"

This release adds optimizations for Loongarch, adds support for vp8 in the

real-time rate control library, upgrades GoogleTest to v1.11.0, updates

libwebm to libwebm-1.0.0.28-20-g206d268, and includes numerous bug fixes.

- Upgrading:

This release is ABI compatible with the previous release.

vp8 support in the real-time rate control library.

New codec control VP8E_SET_RTC_EXTERNAL_RATECTRL is added.

Configure support for darwin21 is added.

GoogleTest is upgraded to v1.11.0.

libwebm is updated to libwebm-1.0.0.28-20-g206d268.

Allow SimpleEncode environment to take target level as input to match

the level conformance in vp9.

- Enhancement:

Numerous improvements on checking memory allocations.

Optimizations for Loongarch.

Code clean-up.

- Bug fixes:

Fix to a crash related to {vp8/vp9}_set_roi_map.

Fix to compiling failure with -Wformat-nonliteral.

Fix to integer overflow with vp9 with high resolution content.

Fix to AddNoiseTest failure with ARMv7.

Fix to libvpx Null-dereference READ in vp8.

2021-09-27 v1.11.0 "Smew Duck"

This maintenance release adds support for VBR mode in VP9 rate control

interface, new codec controls to get quantization parameters and loop filter

levels, and includes several improvements to NEON and numerous bug fixes.

- Upgrading:

This release is ABI incompatible with the previous release.

New codec control is added to get quantization parameters and loop filter

levels.

VBR mode is supported in VP9 rate control library.

- Enhancement:

Numerous improvements for Neon optimizations.

Code clean-up and refactoring.

Calculation of rd multiplier is changed with BDRATE gains.

- Bug fixes:

Fix to overflow on duration.

Fix to several instances of -Wunused-but-set-variable.

Fix to avoid chroma resampling for 420mpeg2 input.

Fix to overflow in calc_iframe_target_size.

Fix to disallow skipping transform and quantization.

Fix some -Wsign-compare warnings in simple_encode.

Fix input file path in simple_encode_test.

Fix valid range for under/over_shoot pct.

2021-03-09 v1.10.0 "Ruddy Duck"

This maintenance release adds support for darwin20 and new codec controls, as

well as numerous bug fixes.

- Upgrading:

This release is ABI incompatible with the previous release.

New codec control is added to disable loopfilter for VP9.

New encoder control is added to disable feature to increase Q on overshoot

detection for CBR.

Configure support for darwin20 is added.

New codec control is added for VP9 rate control. The control ID of this

interface is VP9E_SET_EXTERNAL_RATE_CONTROL. To make VP9 use a customized

external rate control model, users will have to implement each callback

function in vpx_rc_funcs_t and register them using libvpx API

vpx_codec_control_() with the control ID.

- Enhancement:

Use -std=gnu++11 instead of -std=c++11 for c++ files.

- Bug fixes:

Override assembler with --as option of configure for MSVS.

Fix several compilation issues with gcc 4.8.5.

Fix to resetting rate control for temporal layers.

Fix to the rate control stats of SVC example encoder when number of spatial

layers is 1.

Fix to reusing motion vectors from the base spatial layer in SVC.

2 pass related flags removed from SVC example encoder.

2020-07-29 v1.9.0 "Quacking Duck"

This release adds support for NV12, a separate library for rate control, as

well as incremental improvements.

- Upgrading:

This release is ABI compatible with the previous release.

NV12 support is added to this release.

A new interface is added for VP9 rate control. The new library libvp9rc.a

must be linked by applications.

Googletest is updated to v1.10.0.

simple_encode.cc is compiled into a new library libsimple_encode.a with

CONFIG_RATE_CTRL.

- Enhancement:

Various changes to improve VP9 SVC, rate control, quality and speed to real

time encoding.

- Bug fixes:

Fix key frame update refresh simulcast flexible svc.

Fix to disable_16x16part speed feature for real time encoding.

Fix some signed integer overflows for VP9 rate control.

Fix initialization of delta_q_uv.

Fix condition in regulate_q for cyclic refresh.

Various fixes to dynamic resizing for VP9 SVC.

2019-12-09 v1.8.2 "Pekin Duck"

This release collects incremental improvements to many aspects of the library.

- Upgrading:

This release is ABI compatible with the previous release.

ARCH_* defines have been removed in favor of VPX_ARCH_*.

2019-07-15 v1.8.1 "Orpington Duck"

This release collects incremental improvements to many aspects of the library.

- Upgrading:

This release is ABI incompatible with the previous release.

VP8E_SET_CPUUSED now accepts values up to 9 for vp9.

VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT had a spelling fix (was VP8E).

The --sdk-path option has been removed. If you were using it to build for

Android please read build/make/Android.mk for alternatives.

All PPC optimizations have been disabled:

https://bugs.chromium.org/p/webm/issues/detail?id=1522.

- Enhancements:

Various changes to improve encoder rate control, quality and speed

for practically every use case.

- Bug fixes:

vp9-rtc: Fix color artifacts for speed >= 8.

2019-01-31 v1.8.0 "Northern Shoveler Duck"

This release focused on encoding performance for realtime and VOD use cases.

- Upgrading:

This release is ABI incompatible with the previous release. This adds and

improves several vp9 controls. Most are related to SVC:

VP9E_SET_SVC_FRAME_DROP_LAYER:

- Frame dropping in SVC.

VP9E_SET_SVC_INTER_LAYER_PRED:

- Inter-layer prediction in SVC.

VP9E_SET_SVC_GF_TEMPORAL_REF:

- Enable long term temporal reference in SVC.

VP9E_SET_SVC_REF_FRAME_CONFIG/VP9E_GET_SVC_REF_FRAME_CONFIG:

- Extend and improve this control for better flexibility in setting SVC

pattern dynamically.

VP9E_SET_POSTENCODE_DROP:

- Allow for post-encode frame dropping (applies to non-SVC too).

VP9E_SET_SVC_SPATIAL_LAYER_SYNC:

- Enable spatial layer sync frames.

VP9E_SET_SVC_LAYER_ID:

- Extend api to specify temporal id for each spatial layers.

VP9E_SET_ROI_MAP:

- Extend Region of Interest functionality to VP9.

- Enhancements:

2 pass vp9 encoding has improved substantially. When using --auto-alt-ref=6,

we see approximately 8% for VBR and 10% for CQ. When using --auto-alt-ref=1,

the gains are approximately 4% for VBR and 5% for CQ.

For real-time encoding, speed 7 has improved by ~5-10%. Encodes targeted at

screen sharing have improved when the content changes significantly (slide

sharing) or scrolls. There is a new speed 9 setting for mobile devices which

is about 10-20% faster than speed 8.

- Bug fixes:

VP9 denoiser issue.

VP9 partition issue for 1080p.

VP9 rate control improvments.

Postprocessing Multi Frame Quality Enhancement (MFQE) issue.

VP8 multithread decoder issues.

A variety of fuzzing issues.

2018-01-04 v1.7.0 "Mandarin Duck"

This release focused on high bit depth performance (10/12 bit) and vp9

encoding improvements.

- Upgrading:

This release is ABI incompatible due to new vp9 encoder features.

Frame parallel decoding for vp9 has been removed.

- Enhancements:

vp9 encoding supports additional threads with --row-mt. This can be greater

than the number of tiles.

Two new vp9 encoder options have been added:

--corpus-complexity

--tune-content=film

Additional tooling for respecting the vp9 "level" profiles has been added.

- Bug fixes:

A variety of fuzzing issues.

vp8 threading fix for ARM.

Codec control VP9_SET_SKIP_LOOP_FILTER fixed.

Reject invalid multi resolution configurations.

2017-01-09 v1.6.1 "Long Tailed Duck"

This release improves upon the VP9 encoder and speeds up the encoding and

decoding processes.

- Upgrading:

This release is ABI compatible with 1.6.0.

- Enhancements:

Faster VP9 encoding and decoding.

High bit depth builds now provide similar speed for 8 bit encode and decode

for x86 targets. Other platforms and higher bit depth improvements are in

progress.

- Bug Fixes:

A variety of fuzzing issues.

2016-07-20 v1.6.0 "Khaki Campbell Duck"

This release improves upon the VP9 encoder and speeds up the encoding and

decoding processes.

- Upgrading:

This release is ABI incompatible with 1.5.0 due to a new 'color_range' enum

in vpx_image and some minor changes to the VP8_COMP structure.

The default key frame interval for VP9 has changed from 128 to 9999.

- Enhancement:

A core focus has been performance for low end Intel processors. SSSE3

instructions such as 'pshufb' have been avoided and instructions have been

reordered to better accommodate the more constrained pipelines.

As a result, devices based on Celeron processors have seen substantial

decoding improvements. From Indian Runner Duck to Javan Whistling Duck,

decoding speed improved between 10 and 30%. Between Javan Whistling Duck

and Khaki Campbell Duck, it improved another 10 to 15%.

While Celeron benefited most, Core-i5 also improved 5% and 10% between the

respective releases.

Realtime performance for WebRTC for both speed and quality has received a

lot of attention.

- Bug Fixes:

A number of fuzzing issues, found variously by Mozilla, Chromium and others,

have been fixed and we strongly recommend updating.

2015-11-09 v1.5.0 "Javan Whistling Duck"

This release improves upon the VP9 encoder and speeds up the encoding and

decoding processes.

- Upgrading:

This release is ABI incompatible with 1.4.0. It drops deprecated VP8

controls and adds a variety of VP9 controls for testing.

The vpxenc utility now prefers VP9 by default.

- Enhancements:

Faster VP9 encoding and decoding

Smaller library size by combining functions used by VP8 and VP9

- Bug Fixes:

A variety of fuzzing issues

2015-04-03 v1.4.0 "Indian Runner Duck"

This release includes significant improvements to the VP9 codec.

- Upgrading:

This release is ABI incompatible with 1.3.0. It drops the compatibility

layer, requiring VPX_IMG_FMT_* instead of IMG_FMT_*, and adds several codec

controls for VP9.

- Enhancements:

Faster VP9 encoding and decoding

Multithreaded VP9 decoding (tile and frame-based)

Multithreaded VP9 encoding - on by default

YUV 4:2:2 and 4:4:4 support in VP9

10 and 12bit support in VP9

64bit ARM support by replacing ARM assembly with intrinsics

- Bug Fixes:

Fixes a VP9 bitstream issue in Profile 1. This only affected non-YUV 4:2:0

files.

- Known Issues:

Frame Parallel decoding fails for segmented and non-420 files.

2013-11-15 v1.3.0 "Forest"

This release introduces the VP9 codec in a backward-compatible way.

All existing users of VP8 can continue to use the library without

modification. However, some VP8 options do not map to VP9 in the same manner.

The VP9 encoder in this release is not feature complete. Users interested in

the encoder are advised to use the git master branch and discuss issues on

libvpx mailing lists.

- Upgrading:

This release is ABI and API compatible with Duclair (v1.0.0). Users

of older releases should refer to the Upgrading notes in this document

for that release.

- Enhancements:

Get rid of bashisms in the main build scripts

Added usage info on command line options

Add lossless compression mode

Dll build of libvpx

Add additional Mac OS X targets: 10.7, 10.8 and 10.9 (darwin11-13)

Add option to disable documentation

configure: add --enable-external-build support

make: support V=1 as short form of verbose=yes

configure: support mingw-w64

configure: support hardfloat armv7 CHOSTS

configure: add support for android x86

Add estimated completion time to vpxenc

Don't exit on decode errors in vpxenc

vpxenc: support scaling prior to encoding

vpxdec: support scaling output

vpxenc: improve progress indicators with --skip

msvs: Don't link to winmm.lib

Add a new script for producing vcxproj files

Produce Visual Studio 10 and 11 project files

Produce Windows Phone project files

msvs-build: use msbuild for vs >= 2005

configure: default configure log to config.log

Add encoding option --static-thresh

- Speed:

Miscellaneous speed optimizations for VP8 and VP9.

- Quality:

In general, quality is consistent with the Eider release.

- Bug Fixes:

This release represents approximately a year of engineering effort,

and contains multiple bug fixes. Please refer to git history for details.

2012-12-21 v1.2.0

This release acts as a checkpoint for a large amount of internal refactoring

and testing. It also contains a number of small bugfixes, so all users are

encouraged to upgrade.

- Upgrading:

This release is ABI and API compatible with Duclair (v1.0.0). Users

of older releases should refer to the Upgrading notes in this

document for that release.

- Enhancements:

VP8 optimizations for MIPS dspr2

vpxenc: add -quiet option

- Speed:

Encoder and decoder speed is consistent with the Eider release.

- Quality:

In general, quality is consistent with the Eider release.

Minor tweaks to ARNR filtering

Minor improvements to real time encoding with multiple temporal layers

- Bug Fixes:

Fixes multithreaded encoder race condition in loopfilter

Fixes multi-resolution threaded encoding

Fix potential encoder dead-lock after picture resize

2012-05-09 v1.1.0 "Eider"

This introduces a number of enhancements, mostly focused on real-time

encoding. In addition, it fixes a decoder bug (first introduced in

Duclair) so all users of that release are encouraged to upgrade.

- Upgrading:

This release is ABI and API compatible with Duclair (v1.0.0). Users

of older releases should refer to the Upgrading notes in this

document for that release.

This release introduces a new temporal denoiser, controlled by the

VP8E_SET_NOISE_SENSITIVITY control. The temporal denoiser does not

currently take a strength parameter, so the control is effectively

a boolean - zero (off) or non-zero (on). For compatibility with

existing applications, the values accepted are the same as those

for the spatial denoiser (0-6). The temporal denoiser is enabled

by default, and the older spatial denoiser may be restored by

configuring with --disable-temporal-denoising. The temporal denoiser

is more computationally intensive than the spatial one.

This release removes support for a legacy, decode only API that was

supported, but deprecated, at the initial release of libvpx

(v0.9.0). This is not expected to have any impact. If you are

impacted, you can apply a reversion to commit 2bf8fb58 locally.

Please update to the latest libvpx API if you are affected.

- Enhancements:

Adds a motion compensated temporal denoiser to the encoder, which

gives higher quality than the older spatial denoiser. (See above

for notes on upgrading).

In addition, support for new compilers and platforms were added,

including:

improved support for XCode

Android x86 NDK build

OS/2 support

SunCC support

Changing resolution with vpx_codec_enc_config_set() is now

supported. Previously, reinitializing the codec was required to

change the input resolution.

The vpxenc application has initial support for producing multiple

encodes from the same input in one call. Resizing is not yet

supported, but varying other codec parameters is. Use -- to

delineate output streams. Options persist from one stream to the

next.

Also, the vpxenc application will now use a keyframe interval of

5 seconds by default. Use the --kf-max-dist option to override.

- Speed:

Decoder performance improved 2.5% versus Duclair. Encoder speed is

consistent with Duclair for most material. Two pass encoding of

slideshow-like material will see significant improvements.

Large realtime encoding speed gains at a small quality expense are

possible by configuring the on-the-fly bitpacking experiment with

--enable-onthefly-bitpacking. Realtime encoder can be up to 13%

faster (ARM) depending on the number of threads and bitrate

settings. This technique sees constant gain over the 5-16 speed

range. For VC style input the loss seen is up to 0.2dB. See commit

52cf4dca for further details.

- Quality:

On the whole, quality is consistent with the Duclair release. Some

tweaks:

Reduced blockiness in easy sections by applying a penalty to

intra modes.

Improved quality of static sections (like slideshows) with

two pass encoding.

Improved keyframe sizing with multiple temporal layers

- Bug Fixes:

Corrected alt-ref contribution to frame rate for visible updates

to the alt-ref buffer. This affected applications making manual

usage of the frame reference flags, or temporal layers.

Additional constraints were added to disable multi-frame quality

enhancement (MFQE) in sections of the frame where there is motion.

(#392)

Fixed corruption issues when vpx_codec_enc_config_set() was called

with spatial resampling enabled.

Fixed a decoder error introduced in Duclair where the segmentation

map was not being reinitialized on keyframes (#378)

2012-01-27 v1.0.0 "Duclair"

Our fourth named release, focused on performance and features related to

real-time encoding. It also fixes a decoder crash bug introduced in

v0.9.7, so all users of that release are encouraged to upgrade.

- Upgrading:

This release is ABI incompatible with prior releases of libvpx, so the

"major" version number has been bumped to 1. You must recompile your

applications against the latest version of the libvpx headers. The

API remains compatible, and this should not require code changes in most

applications.

- Enhancements:

This release introduces several substantial new features to the encoder,

of particular interest to real time streaming applications.

Temporal scalability allows the encoder to produce a stream that can

be decimated to different frame rates, with independent rate targeting

for each substream.

Multiframe quality enhancement postprocessing can make visual quality

more consistent in the presence of frames that are substantially

different quality than the surrounding frames, as in the temporal

scalability case and in some forced keyframe scenarios.

Multiple-resolution encoding support allows the encoding of the

same content at different resolutions faster than encoding them

separately.

- Speed:

Optimization targets for this release included the decoder and the real-

time modes of the encoder. Decoder speed on x86 has improved 10.5% with

this release. Encoder improvements followed a curve where speeds 1-3

improved 4.0%-1.5%, speeds 4-8 improved <1%, and speeds 9-16 improved

1.5% to 10.5%, respectively. "Best" mode speed is consistent with the

Cayuga release.

- Quality:

Encoder quality in the single stream case is consistent with the Cayuga

release.

- Bug Fixes:

This release fixes an OOB read decoder crash bug present in v0.9.7

related to the clamping of motion vectors in SPLITMV blocks. This

behavior could be triggered by corrupt input or by starting

decoding from a P-frame.

2011-08-15 v0.9.7-p1 "Cayuga" patch 1

This is an incremental bugfix release against Cayuga. All users of that

release are strongly encouraged to upgrade.

- Fix potential OOB reads (cdae03a)

An unbounded out of bounds read was discovered when the

decoder was requested to perform error concealment (new in

Cayuga) given a frame with corrupt partition sizes.

A bounded out of bounds read was discovered affecting all

versions of libvpx. Given an multipartition input frame that

is truncated between the mode/mv partition and the first

residiual paritition (in the block of partition offsets), up

to 3 extra bytes could have been read from the source buffer.

The code will not take any action regardless of the contents

of these undefined bytes, as the truncated buffer is detected

immediately following the read based on the calculated

starting position of the coefficient partition.

- Fix potential error concealment crash when the very first frame

is missing or corrupt (a609be5)

- Fix significant artifacts in error concealment (a4c2211, 99d870a)

- Revert 1-pass CBR rate control changes (e961317)

Further testing showed this change produced undesirable visual

artifacts, rolling back for now.

2011-08-02 v0.9.7 "Cayuga"

Our third named release, focused on a faster, higher quality, encoder.

- Upgrading:

This release is backwards compatible with Aylesbury (v0.9.5) and

Bali (v0.9.6). Users of older releases should refer to the Upgrading

notes in this document for that release.

- Enhancements:

Stereo 3D format support for vpxenc

Runtime detection of available processor cores.

Allow specifying --end-usage by enum name

vpxdec: test for frame corruption

vpxenc: add quantizer histogram display

vpxenc: add rate histogram display

Set VPX_FRAME_IS_DROPPABLE

update configure for ios sdk 4.3

Avoid text relocations in ARM vp8 decoder

Generate a vpx.pc file for pkg-config.

New ways of passing encoded data between encoder and decoder.

- Speed:

This release includes across-the-board speed improvements to the

encoder. On x86, these measure at approximately 11.5% in Best mode,

21.5% in Good mode (speed 0), and 22.5% in Realtime mode (speed 6).

On ARM Cortex A9 with Neon extensions, real-time encoding of video

telephony content is 35% faster than Bali on single core and 48%

faster on multi-core. On the NVidia Tegra2 platform, real time

encoding is 40% faster than Bali.

Decoder speed was not a priority for this release, but improved

approximately 8.4% on x86.

Reduce motion vector search on alt-ref frame.

Encoder loopfilter running in its own thread

Reworked loopfilter to precalculate more parameters

SSE2/SSSE3 optimizations for build_predictors_mbuv{,_s}().

Make hor UV predict ~2x faster (73 vs 132 cycles) using SSSE3.

Removed redundant checks

Reduced structure sizes

utilize preload in ARMv6 MC/LPF/Copy routines

ARM optimized quantization, dfct, variance, subtract

Increase chrow row alignment to 16 bytes.

disable trellis optimization for first pass

Write SSSE3 sub-pixel filter function

Improve SSE2 half-pixel filter funtions

Add vp8_sub_pixel_variance16x8_ssse3 function

Reduce unnecessary distortion computation

Use diamond search to replace full search

Preload reference area in sub-pixel motion search (real-time mode)

- Quality:

This release focused primarily on one-pass use cases, including

video conferencing. Low latency data rate control was significantly

improved, improving streamability over bandwidth constrained links.

Added support for error concealment, allowing frames to maintain

visual quality in the presence of substantial packet loss.

Add rc_max_intra_bitrate_pct control

Limit size of initial keyframe in one-pass.

Improve framerate adaptation

Improved 1-pass CBR rate control

Improved KF insertion after fades to still.

Improved key frame detection.

Improved activity masking (lower PSNR impact for same SSIM boost)

Improved interaction between GF and ARFs

Adding error-concealment to the decoder.

Adding support for independent partitions

Adjusted rate-distortion constants

- Bug Fixes:

Removed firstpass motion map

Fix parallel make install

Fix multithreaded encoding for 1 MB wide frame

Fixed iwalsh_neon build problems with RVDS4.1

Fix semaphore emulation, spin-wait intrinsics on Windows

Fix build with xcode4 and simplify GLOBAL.

Mark ARM asm objects as allowing a non-executable stack.

Fix vpxenc encoding incorrect webm file header on big endian

2011-03-07 v0.9.6 "Bali"

Our second named release, focused on a faster, higher quality, encoder.

- Upgrading:

This release is backwards compatible with Aylesbury (v0.9.5). Users

of older releases should refer to the Upgrading notes in this

document for that release.

- Enhancements:

vpxenc --psnr shows a summary when encode completes

--tune=ssim option to enable activity masking

improved postproc visualizations for development

updated support for Apple iOS to SDK 4.2

query decoder to determine which reference frames were updated

implemented error tracking in the decoder

fix pipe support on windows

- Speed:

Primary focus was on good quality mode, speed 0. Average improvement

on x86 about 40%, up to 100% on user-generated content at that speed.

Best quality mode speed improved 35%, and realtime speed 10-20%. This

release also saw significant improvement in realtime encoding speed

on ARM platforms.

Improved encoder threading

Dont pick encoder filter level when loopfilter is disabled.

Avoid double copying of key frames into alt and golden buffer

FDCT optimizations.

x86 sse2 temporal filter

SSSE3 version of fast quantizer

vp8_rd_pick_best_mbsegmentation code restructure

Adjusted breakout RD for SPLITMV

Changed segmentation check order

Improved rd_pick_intra4x4block

Adds armv6 optimized variance calculation

ARMv6 optimized sad16x16

ARMv6 optimized half pixel variance calculations

Full search SAD function optimization in SSE4.1

Improve MV prediction accuracy to achieve performance gain

Improve MV prediction in vp8_pick_inter_mode() for speed>3

- Quality:

Best quality mode improved PSNR 6.3%, and SSIM 6.1%. This release

also includes support for "activity masking," which greatly improves

SSIM at the expense of PSNR. For now, this feature is available with

the --tune=ssim option. Further experimentation in this area

is ongoing. This release also introduces a new rate control mode

called "CQ," which changes the allocation of bits within a clip to

the sections where they will have the most visual impact.

Tuning for the more exact quantizer.

Relax rate control for last few frames

CQ Mode

Limit key frame quantizer for forced key frames.

KF/GF Pulsing

Add simple version of activity masking.

make rdmult adaptive for intra in quantizer RDO

cap the best quantizer for 2nd order DC

change the threshold of DC check for encode breakout

- Bug Fixes:

Fix crash on Sparc Solaris.

Fix counter of fixed keyframe distance

ARNR filter pointer update bug fix

Fixed use of motion percentage in KF/GF group calc

Changed condition for using RD in Intra Mode

Fix encoder real-time only configuration.

Fix ARM encoder crash with multiple token partitions

Fixed bug first cluster timecode of webm file is wrong.

Fixed various encoder bugs with odd-sized images

vp8e_get_preview fixed when spatial resampling enabled

quantizer: fix assertion in fast quantizer path

Allocate source buffers to be multiples of 16

Fix for manual Golden frame frequency

Fix drastic undershoot in long form content

2010-10-28 v0.9.5 "Aylesbury"

Our first named release, focused on a faster decoder, and a better encoder.

- Upgrading:

This release incorporates backwards-incompatible changes to the

ivfenc and ivfdec tools. These tools are now called vpxenc and vpxdec.

vpxdec

* the -q (quiet) option has been removed, and replaced with

-v (verbose). the output is quiet by default. Use -v to see

the version number of the binary.

* The default behavior is now to write output to a single file

instead of individual frames. The -y option has been removed.

Y4M output is the default.

* For raw I420/YV12 output instead of Y4M, the --i420 or --yv12

options must be specified.

$ ivfdec -o OUTPUT INPUT

$ vpxdec --i420 -o OUTPUT INPUT

* If an output file is not specified, the default is to write

Y4M to stdout. This makes piping more natural.

$ ivfdec -y -o - INPUT | ...

$ vpxdec INPUT | ...

* The output file has additional flexibility for formatting the

filename. It supports escape characters for constructing a

filename from the width, height, and sequence number. This

replaces the -p option. To get the equivalent:

$ ivfdec -p frame INPUT

$ vpxdec --i420 -o frame-%wx%h-%4.i420 INPUT

vpxenc

* The output file must be specified with -o, rather than as the

last argument.

$ ivfenc <options> INPUT OUTPUT

$ vpxenc <options> -o OUTPUT INPUT

* The output defaults to webm. To get IVF output, use the --ivf

option.

$ ivfenc <options> INPUT OUTPUT.ivf

$ vpxenc <options> -o OUTPUT.ivf --ivf INPUT

- Enhancements:

ivfenc and ivfdec have been renamed to vpxenc, vpxdec.

vpxdec supports .webm input

vpxdec writes .y4m by default

vpxenc writes .webm output by default

vpxenc --psnr now shows the average/overall PSNR at the end

ARM platforms now support runtime cpu detection

vpxdec visualizations added for motion vectors, block modes, references

vpxdec now silent by default