ref: d9ca52452bff9481ec1ed4684985a86fb7fc3c3e
dir: /CHANGELOG/
NOTE FOR NEXT RELEASE: PLEASE DOCUMENT API CHANGE TO NOISE SENSITIVITY FEATURE
AND WARN PEOPLE THAT FOR NOW IT'S EITHER ON OR OFF
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 targetting
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
vpxdec --progress shows frame-by-frame timing information
vpxenc supports the distinction between --fps and --timebase
NASM is now a supported assembler
configure: enable PIC for shared libs by default
configure: add --enable-small
configure: support for ppc32-linux-gcc
configure: support for sparc-solaris-gcc
- Bugs:
Improve handling of invalid frames
Fix valgrind errors in the NEON loop filters.
Fix loopfilter delta zero transitions
Fix valgrind errors in vp8_sixtap_predict8x4_armv6().
Build fixes for darwin-icc
- Speed:
20-40% (average 28%) improvement in libvpx decoder speed,
including:
Rewrite vp8_short_walsh4x4_sse2()
Optimizations on the loopfilters.
Miscellaneous improvements for Atom
Add 4-tap version of 2nd-pass ARMv6 MC filter.
Improved multithread utilization
Better instruction choices on x86
reorder data to use wider instructions
Update NEON wide idcts
Make block access to frame buffer sequential
Improved subset block search
Bilinear subpixel optimizations for ssse3.
Decrease memory footprint
Encoder speed improvements (percentage gain not measured):
Skip unnecessary search of identical frames
Add SSE2 subtract functions
Improve bounds checking in vp8_diamond_search_sadx4()
Added vp8_fast_quantize_b_sse2
- Quality:
Over 7% overall PSNR improvement (6.3% SSIM) in "best" quality
encoding mode, and up to 60% improvement on very noisy, still
or slow moving source video
Motion compensated temporal filter for Alt-Ref Noise Reduction
Improved use of trellis quantization on 2nd order Y blocks
Tune effect of motion on KF/GF boost in two pass
Allow coefficient optimization for good quality speed 0.
Improved control of active min quantizer for two pass.
Enable ARFs for non-lagged compress
2010-09-02 v0.9.2
- Enhancements:
Disable frame dropping by default
Improved multithreaded performance
Improved Force Key Frame Behaviour
Increased rate control buffer level precision
Fix bug in 1st pass motion compensation
ivfenc: correct fixed kf interval, --disable-kf
- Speed:
Changed above and left context data layout
Rework idct calling structure.
Removed unnecessary MB_MODE_INFO copies
x86: SSSE3 sixtap prediction
Reworked IDCT to include reconstruction (add) step
Swap alt/gold/new/last frame buffer ptrs instead of copying.
Improve SSE2 loopfilter functions
Change bitreader to use a larger window.
Avoid loopfilter reinitialization when possible
- Quality:
Normalize quantizer's zero bin and rounding factors
Add trellis quantization.
Make the quantizer exact.
Updates to ARNR filtering algorithm
Fix breakout thresh computation for golden & AltRef frames
Redo the forward 4x4 dct
Improve the accuracy of forward walsh-hadamard transform
Further adjustment of RD behaviour with Q and Zbin.
- Build System:
Allow linking of libs built with MinGW to MSVC
Fix target auto-detection on mingw32
Allow --cpu= to work for x86.
configure: pass original arguments through to make dist
Fix builds without runtime CPU detection
msvs: fix install of codec sources
msvs: Change devenv.com command line for better msys support
msvs: Add vs9 targets.
Add x86_64-linux-icc target
- Bugs:
Potential crashes on older MinGW builds
Fix two-pass framrate for Y4M input.
Fixed simple loop filter, other crashes on ARM v6
arm: fix missing dependency with --enable-shared
configure: support directories containing .o
Replace pinsrw (SSE) with MMX instructions
apple: include proper mach primatives
Fixed rate control bug with long key frame interval.
Fix DSO link errors on x86-64 when not using a version script
Fixed buffer selection for UV in AltRef filtering
2010-06-17 v0.9.1
- Enhancements:
* ivfenc/ivfdec now support YUV4MPEG2 input and pipe I/O
* Speed optimizations
- Bugfixes:
* Rate control
* Prevent out-of-bounds accesses on invalid data
- Build system updates:
* Detect toolchain to be used automatically for native builds
* Support building shared libraries
* Better autotools emulation (--prefix, --libdir, DESTDIR)
- Updated LICENSE
* http://webmproject.blogspot.com/2010/06/changes-to-webm-open-source-license.html
2010-05-18 v0.9.0
- Initial open source release. Welcome to WebM and VP8!