417 lines
17 KiB
Plaintext
417 lines
17 KiB
Plaintext
NOTE FOR NEXT RELEASE: PLEASE DOCUMENT API CHANGE TO NOISE SENSITIVITY FEATURE
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AND WARN PEOPLE THAT FOR NOW IT'S EITHER ON OR OFF
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2012-01-27 v1.0.0 "Duclair"
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Our fourth named release, focused on performance and features related to
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real-time encoding. It also fixes a decoder crash bug introduced in
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v0.9.7, so all users of that release are encouraged to upgrade.
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- Upgrading:
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This release is ABI incompatible with prior releases of libvpx, so the
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"major" version number has been bumped to 1. You must recompile your
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applications against the latest version of the libvpx headers. The
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API remains compatible, and this should not require code changes in most
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applications.
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- Enhancements:
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This release introduces several substantial new features to the encoder,
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of particular interest to real time streaming applications.
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Temporal scalability allows the encoder to produce a stream that can
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be decimated to different frame rates, with independent rate targetting
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for each substream.
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Multiframe quality enhancement postprocessing can make visual quality
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more consistent in the presence of frames that are substantially
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different quality than the surrounding frames, as in the temporal
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scalability case and in some forced keyframe scenarios.
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Multiple-resolution encoding support allows the encoding of the
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same content at different resolutions faster than encoding them
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separately.
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- Speed:
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Optimization targets for this release included the decoder and the real-
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time modes of the encoder. Decoder speed on x86 has improved 10.5% with
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this release. Encoder improvements followed a curve where speeds 1-3
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improved 4.0%-1.5%, speeds 4-8 improved <1%, and speeds 9-16 improved
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1.5% to 10.5%, respectively. "Best" mode speed is consistent with the
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Cayuga release.
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- Quality:
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Encoder quality in the single stream case is consistent with the Cayuga
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release.
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- Bug Fixes:
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This release fixes an OOB read decoder crash bug present in v0.9.7
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related to the clamping of motion vectors in SPLITMV blocks. This
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behavior could be triggered by corrupt input or by starting
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decoding from a P-frame.
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2011-08-15 v0.9.7-p1 "Cayuga" patch 1
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This is an incremental bugfix release against Cayuga. All users of that
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release are strongly encouraged to upgrade.
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- Fix potential OOB reads (cdae03a)
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An unbounded out of bounds read was discovered when the
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decoder was requested to perform error concealment (new in
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Cayuga) given a frame with corrupt partition sizes.
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A bounded out of bounds read was discovered affecting all
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versions of libvpx. Given an multipartition input frame that
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is truncated between the mode/mv partition and the first
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residiual paritition (in the block of partition offsets), up
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to 3 extra bytes could have been read from the source buffer.
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The code will not take any action regardless of the contents
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of these undefined bytes, as the truncated buffer is detected
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immediately following the read based on the calculated
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starting position of the coefficient partition.
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- Fix potential error concealment crash when the very first frame
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is missing or corrupt (a609be5)
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- Fix significant artifacts in error concealment (a4c2211, 99d870a)
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- Revert 1-pass CBR rate control changes (e961317)
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Further testing showed this change produced undesirable visual
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artifacts, rolling back for now.
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2011-08-02 v0.9.7 "Cayuga"
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Our third named release, focused on a faster, higher quality, encoder.
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- Upgrading:
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This release is backwards compatible with Aylesbury (v0.9.5) and
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Bali (v0.9.6). Users of older releases should refer to the Upgrading
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notes in this document for that release.
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- Enhancements:
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Stereo 3D format support for vpxenc
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Runtime detection of available processor cores.
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Allow specifying --end-usage by enum name
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vpxdec: test for frame corruption
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vpxenc: add quantizer histogram display
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vpxenc: add rate histogram display
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Set VPX_FRAME_IS_DROPPABLE
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update configure for ios sdk 4.3
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Avoid text relocations in ARM vp8 decoder
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Generate a vpx.pc file for pkg-config.
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New ways of passing encoded data between encoder and decoder.
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- Speed:
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This release includes across-the-board speed improvements to the
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encoder. On x86, these measure at approximately 11.5% in Best mode,
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21.5% in Good mode (speed 0), and 22.5% in Realtime mode (speed 6).
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On ARM Cortex A9 with Neon extensions, real-time encoding of video
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telephony content is 35% faster than Bali on single core and 48%
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faster on multi-core. On the NVidia Tegra2 platform, real time
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encoding is 40% faster than Bali.
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Decoder speed was not a priority for this release, but improved
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approximately 8.4% on x86.
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Reduce motion vector search on alt-ref frame.
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Encoder loopfilter running in its own thread
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Reworked loopfilter to precalculate more parameters
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SSE2/SSSE3 optimizations for build_predictors_mbuv{,_s}().
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Make hor UV predict ~2x faster (73 vs 132 cycles) using SSSE3.
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Removed redundant checks
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Reduced structure sizes
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utilize preload in ARMv6 MC/LPF/Copy routines
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ARM optimized quantization, dfct, variance, subtract
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Increase chrow row alignment to 16 bytes.
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disable trellis optimization for first pass
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Write SSSE3 sub-pixel filter function
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Improve SSE2 half-pixel filter funtions
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Add vp8_sub_pixel_variance16x8_ssse3 function
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Reduce unnecessary distortion computation
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Use diamond search to replace full search
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Preload reference area in sub-pixel motion search (real-time mode)
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- Quality:
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This release focused primarily on one-pass use cases, including
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video conferencing. Low latency data rate control was significantly
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improved, improving streamability over bandwidth constrained links.
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Added support for error concealment, allowing frames to maintain
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visual quality in the presence of substantial packet loss.
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Add rc_max_intra_bitrate_pct control
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Limit size of initial keyframe in one-pass.
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Improve framerate adaptation
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Improved 1-pass CBR rate control
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Improved KF insertion after fades to still.
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Improved key frame detection.
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Improved activity masking (lower PSNR impact for same SSIM boost)
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Improved interaction between GF and ARFs
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Adding error-concealment to the decoder.
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Adding support for independent partitions
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Adjusted rate-distortion constants
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- Bug Fixes:
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Removed firstpass motion map
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Fix parallel make install
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Fix multithreaded encoding for 1 MB wide frame
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Fixed iwalsh_neon build problems with RVDS4.1
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Fix semaphore emulation, spin-wait intrinsics on Windows
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Fix build with xcode4 and simplify GLOBAL.
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Mark ARM asm objects as allowing a non-executable stack.
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Fix vpxenc encoding incorrect webm file header on big endian
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2011-03-07 v0.9.6 "Bali"
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Our second named release, focused on a faster, higher quality, encoder.
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- Upgrading:
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This release is backwards compatible with Aylesbury (v0.9.5). Users
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of older releases should refer to the Upgrading notes in this
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document for that release.
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- Enhancements:
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vpxenc --psnr shows a summary when encode completes
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--tune=ssim option to enable activity masking
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improved postproc visualizations for development
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updated support for Apple iOS to SDK 4.2
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query decoder to determine which reference frames were updated
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implemented error tracking in the decoder
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fix pipe support on windows
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- Speed:
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Primary focus was on good quality mode, speed 0. Average improvement
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on x86 about 40%, up to 100% on user-generated content at that speed.
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Best quality mode speed improved 35%, and realtime speed 10-20%. This
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release also saw significant improvement in realtime encoding speed
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on ARM platforms.
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Improved encoder threading
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Dont pick encoder filter level when loopfilter is disabled.
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Avoid double copying of key frames into alt and golden buffer
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FDCT optimizations.
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x86 sse2 temporal filter
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SSSE3 version of fast quantizer
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vp8_rd_pick_best_mbsegmentation code restructure
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Adjusted breakout RD for SPLITMV
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Changed segmentation check order
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Improved rd_pick_intra4x4block
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Adds armv6 optimized variance calculation
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ARMv6 optimized sad16x16
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ARMv6 optimized half pixel variance calculations
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Full search SAD function optimization in SSE4.1
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Improve MV prediction accuracy to achieve performance gain
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Improve MV prediction in vp8_pick_inter_mode() for speed>3
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- Quality:
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Best quality mode improved PSNR 6.3%, and SSIM 6.1%. This release
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also includes support for "activity masking," which greatly improves
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SSIM at the expense of PSNR. For now, this feature is available with
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the --tune=ssim option. Further experimentation in this area
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is ongoing. This release also introduces a new rate control mode
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called "CQ," which changes the allocation of bits within a clip to
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the sections where they will have the most visual impact.
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Tuning for the more exact quantizer.
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Relax rate control for last few frames
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CQ Mode
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Limit key frame quantizer for forced key frames.
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KF/GF Pulsing
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Add simple version of activity masking.
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make rdmult adaptive for intra in quantizer RDO
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cap the best quantizer for 2nd order DC
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change the threshold of DC check for encode breakout
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- Bug Fixes:
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Fix crash on Sparc Solaris.
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Fix counter of fixed keyframe distance
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ARNR filter pointer update bug fix
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Fixed use of motion percentage in KF/GF group calc
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Changed condition for using RD in Intra Mode
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Fix encoder real-time only configuration.
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Fix ARM encoder crash with multiple token partitions
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Fixed bug first cluster timecode of webm file is wrong.
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Fixed various encoder bugs with odd-sized images
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vp8e_get_preview fixed when spatial resampling enabled
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quantizer: fix assertion in fast quantizer path
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Allocate source buffers to be multiples of 16
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Fix for manual Golden frame frequency
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Fix drastic undershoot in long form content
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2010-10-28 v0.9.5 "Aylesbury"
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Our first named release, focused on a faster decoder, and a better encoder.
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- Upgrading:
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This release incorporates backwards-incompatible changes to the
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ivfenc and ivfdec tools. These tools are now called vpxenc and vpxdec.
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vpxdec
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* the -q (quiet) option has been removed, and replaced with
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-v (verbose). the output is quiet by default. Use -v to see
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the version number of the binary.
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* The default behavior is now to write output to a single file
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instead of individual frames. The -y option has been removed.
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Y4M output is the default.
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* For raw I420/YV12 output instead of Y4M, the --i420 or --yv12
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options must be specified.
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$ ivfdec -o OUTPUT INPUT
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$ vpxdec --i420 -o OUTPUT INPUT
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* If an output file is not specified, the default is to write
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Y4M to stdout. This makes piping more natural.
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$ ivfdec -y -o - INPUT | ...
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$ vpxdec INPUT | ...
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* The output file has additional flexibility for formatting the
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filename. It supports escape characters for constructing a
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filename from the width, height, and sequence number. This
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replaces the -p option. To get the equivalent:
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$ ivfdec -p frame INPUT
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$ vpxdec --i420 -o frame-%wx%h-%4.i420 INPUT
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vpxenc
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* The output file must be specified with -o, rather than as the
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last argument.
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$ ivfenc <options> INPUT OUTPUT
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$ vpxenc <options> -o OUTPUT INPUT
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* The output defaults to webm. To get IVF output, use the --ivf
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option.
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$ ivfenc <options> INPUT OUTPUT.ivf
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$ vpxenc <options> -o OUTPUT.ivf --ivf INPUT
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- Enhancements:
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ivfenc and ivfdec have been renamed to vpxenc, vpxdec.
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vpxdec supports .webm input
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vpxdec writes .y4m by default
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vpxenc writes .webm output by default
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vpxenc --psnr now shows the average/overall PSNR at the end
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ARM platforms now support runtime cpu detection
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vpxdec visualizations added for motion vectors, block modes, references
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vpxdec now silent by default
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vpxdec --progress shows frame-by-frame timing information
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vpxenc supports the distinction between --fps and --timebase
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NASM is now a supported assembler
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configure: enable PIC for shared libs by default
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configure: add --enable-small
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configure: support for ppc32-linux-gcc
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configure: support for sparc-solaris-gcc
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- Bugs:
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Improve handling of invalid frames
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Fix valgrind errors in the NEON loop filters.
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Fix loopfilter delta zero transitions
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Fix valgrind errors in vp8_sixtap_predict8x4_armv6().
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Build fixes for darwin-icc
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- Speed:
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20-40% (average 28%) improvement in libvpx decoder speed,
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including:
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Rewrite vp8_short_walsh4x4_sse2()
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Optimizations on the loopfilters.
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Miscellaneous improvements for Atom
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Add 4-tap version of 2nd-pass ARMv6 MC filter.
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Improved multithread utilization
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Better instruction choices on x86
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reorder data to use wider instructions
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Update NEON wide idcts
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Make block access to frame buffer sequential
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Improved subset block search
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Bilinear subpixel optimizations for ssse3.
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Decrease memory footprint
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Encoder speed improvements (percentage gain not measured):
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Skip unnecessary search of identical frames
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Add SSE2 subtract functions
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Improve bounds checking in vp8_diamond_search_sadx4()
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Added vp8_fast_quantize_b_sse2
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- Quality:
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Over 7% overall PSNR improvement (6.3% SSIM) in "best" quality
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encoding mode, and up to 60% improvement on very noisy, still
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or slow moving source video
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Motion compensated temporal filter for Alt-Ref Noise Reduction
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Improved use of trellis quantization on 2nd order Y blocks
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Tune effect of motion on KF/GF boost in two pass
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Allow coefficient optimization for good quality speed 0.
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Improved control of active min quantizer for two pass.
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Enable ARFs for non-lagged compress
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2010-09-02 v0.9.2
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- Enhancements:
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Disable frame dropping by default
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Improved multithreaded performance
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Improved Force Key Frame Behaviour
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Increased rate control buffer level precision
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Fix bug in 1st pass motion compensation
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ivfenc: correct fixed kf interval, --disable-kf
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- Speed:
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Changed above and left context data layout
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Rework idct calling structure.
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Removed unnecessary MB_MODE_INFO copies
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x86: SSSE3 sixtap prediction
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Reworked IDCT to include reconstruction (add) step
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Swap alt/gold/new/last frame buffer ptrs instead of copying.
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Improve SSE2 loopfilter functions
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Change bitreader to use a larger window.
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Avoid loopfilter reinitialization when possible
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- Quality:
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Normalize quantizer's zero bin and rounding factors
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Add trellis quantization.
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Make the quantizer exact.
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Updates to ARNR filtering algorithm
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Fix breakout thresh computation for golden & AltRef frames
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Redo the forward 4x4 dct
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Improve the accuracy of forward walsh-hadamard transform
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Further adjustment of RD behaviour with Q and Zbin.
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- Build System:
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Allow linking of libs built with MinGW to MSVC
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Fix target auto-detection on mingw32
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Allow --cpu= to work for x86.
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configure: pass original arguments through to make dist
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Fix builds without runtime CPU detection
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msvs: fix install of codec sources
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msvs: Change devenv.com command line for better msys support
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msvs: Add vs9 targets.
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Add x86_64-linux-icc target
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- Bugs:
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Potential crashes on older MinGW builds
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Fix two-pass framrate for Y4M input.
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Fixed simple loop filter, other crashes on ARM v6
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arm: fix missing dependency with --enable-shared
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configure: support directories containing .o
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Replace pinsrw (SSE) with MMX instructions
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apple: include proper mach primatives
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Fixed rate control bug with long key frame interval.
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Fix DSO link errors on x86-64 when not using a version script
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Fixed buffer selection for UV in AltRef filtering
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2010-06-17 v0.9.1
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- Enhancements:
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* ivfenc/ivfdec now support YUV4MPEG2 input and pipe I/O
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* Speed optimizations
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- Bugfixes:
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* Rate control
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* Prevent out-of-bounds accesses on invalid data
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- Build system updates:
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* Detect toolchain to be used automatically for native builds
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* Support building shared libraries
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* Better autotools emulation (--prefix, --libdir, DESTDIR)
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- Updated LICENSE
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* http://webmproject.blogspot.com/2010/06/changes-to-webm-open-source-license.html
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2010-05-18 v0.9.0
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- Initial open source release. Welcome to WebM and VP8!
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