2 This release acts as a checkpoint for a large amount of internal refactoring
3 and testing. It also contains a number of small bugfixes, so all users are
7 This release is ABI and API compatible with Duclair (v1.0.0). Users
8 of older releases should refer to the Upgrading notes in this
9 document for that release.
12 VP8 optimizations for MIPS dspr2
13 vpxenc: add -quiet option
16 Encoder and decoder speed is consistent with the Eider release.
19 In general, quality is consistent with the Eider release.
21 Minor tweaks to ARNR filtering
22 Minor improvements to real time encoding with multiple temporal layers
25 Fixes multithreaded encoder race condition in loopfilter
26 Fixes multi-resolution threaded encoding
27 Fix potential encoder dead-lock after picture resize
30 2012-05-09 v1.1.0 "Eider"
31 This introduces a number of enhancements, mostly focused on real-time
32 encoding. In addition, it fixes a decoder bug (first introduced in
33 Duclair) so all users of that release are encouraged to upgrade.
36 This release is ABI and API compatible with Duclair (v1.0.0). Users
37 of older releases should refer to the Upgrading notes in this
38 document for that release.
40 This release introduces a new temporal denoiser, controlled by the
41 VP8E_SET_NOISE_SENSITIVITY control. The temporal denoiser does not
42 currently take a strength parameter, so the control is effectively
43 a boolean - zero (off) or non-zero (on). For compatibility with
44 existing applications, the values accepted are the same as those
45 for the spatial denoiser (0-6). The temporal denoiser is enabled
46 by default, and the older spatial denoiser may be restored by
47 configuring with --disable-temporal-denoising. The temporal denoiser
48 is more computationally intensive than the spatial one.
50 This release removes support for a legacy, decode only API that was
51 supported, but deprecated, at the initial release of libvpx
52 (v0.9.0). This is not expected to have any impact. If you are
53 impacted, you can apply a reversion to commit 2bf8fb58 locally.
54 Please update to the latest libvpx API if you are affected.
57 Adds a motion compensated temporal denoiser to the encoder, which
58 gives higher quality than the older spatial denoiser. (See above
59 for notes on upgrading).
61 In addition, support for new compilers and platforms were added,
63 improved support for XCode
68 Changing resolution with vpx_codec_enc_config_set() is now
69 supported. Previously, reinitializing the codec was required to
70 change the input resolution.
72 The vpxenc application has initial support for producing multiple
73 encodes from the same input in one call. Resizing is not yet
74 supported, but varying other codec parameters is. Use -- to
75 delineate output streams. Options persist from one stream to the
78 Also, the vpxenc application will now use a keyframe interval of
79 5 seconds by default. Use the --kf-max-dist option to override.
82 Decoder performance improved 2.5% versus Duclair. Encoder speed is
83 consistent with Duclair for most material. Two pass encoding of
84 slideshow-like material will see significant improvements.
86 Large realtime encoding speed gains at a small quality expense are
87 possible by configuring the on-the-fly bitpacking experiment with
88 --enable-onthefly-bitpacking. Realtime encoder can be up to 13%
89 faster (ARM) depending on the number of threads and bitrate
90 settings. This technique sees constant gain over the 5-16 speed
91 range. For VC style input the loss seen is up to 0.2dB. See commit
92 52cf4dca for further details.
95 On the whole, quality is consistent with the Duclair release. Some
98 Reduced blockiness in easy sections by applying a penalty to
101 Improved quality of static sections (like slideshows) with
104 Improved keyframe sizing with multiple temporal layers
107 Corrected alt-ref contribution to frame rate for visible updates
108 to the alt-ref buffer. This affected applications making manual
109 usage of the frame reference flags, or temporal layers.
111 Additional constraints were added to disable multi-frame quality
112 enhancement (MFQE) in sections of the frame where there is motion.
115 Fixed corruption issues when vpx_codec_enc_config_set() was called
116 with spatial resampling enabled.
118 Fixed a decoder error introduced in Duclair where the segmentation
119 map was not being reinitialized on keyframes (#378)
122 2012-01-27 v1.0.0 "Duclair"
123 Our fourth named release, focused on performance and features related to
124 real-time encoding. It also fixes a decoder crash bug introduced in
125 v0.9.7, so all users of that release are encouraged to upgrade.
128 This release is ABI incompatible with prior releases of libvpx, so the
129 "major" version number has been bumped to 1. You must recompile your
130 applications against the latest version of the libvpx headers. The
131 API remains compatible, and this should not require code changes in most
135 This release introduces several substantial new features to the encoder,
136 of particular interest to real time streaming applications.
138 Temporal scalability allows the encoder to produce a stream that can
139 be decimated to different frame rates, with independent rate targetting
142 Multiframe quality enhancement postprocessing can make visual quality
143 more consistent in the presence of frames that are substantially
144 different quality than the surrounding frames, as in the temporal
145 scalability case and in some forced keyframe scenarios.
147 Multiple-resolution encoding support allows the encoding of the
148 same content at different resolutions faster than encoding them
152 Optimization targets for this release included the decoder and the real-
153 time modes of the encoder. Decoder speed on x86 has improved 10.5% with
154 this release. Encoder improvements followed a curve where speeds 1-3
155 improved 4.0%-1.5%, speeds 4-8 improved <1%, and speeds 9-16 improved
156 1.5% to 10.5%, respectively. "Best" mode speed is consistent with the
160 Encoder quality in the single stream case is consistent with the Cayuga
164 This release fixes an OOB read decoder crash bug present in v0.9.7
165 related to the clamping of motion vectors in SPLITMV blocks. This
166 behavior could be triggered by corrupt input or by starting
167 decoding from a P-frame.
170 2011-08-15 v0.9.7-p1 "Cayuga" patch 1
171 This is an incremental bugfix release against Cayuga. All users of that
172 release are strongly encouraged to upgrade.
174 - Fix potential OOB reads (cdae03a)
176 An unbounded out of bounds read was discovered when the
177 decoder was requested to perform error concealment (new in
178 Cayuga) given a frame with corrupt partition sizes.
180 A bounded out of bounds read was discovered affecting all
181 versions of libvpx. Given an multipartition input frame that
182 is truncated between the mode/mv partition and the first
183 residiual paritition (in the block of partition offsets), up
184 to 3 extra bytes could have been read from the source buffer.
185 The code will not take any action regardless of the contents
186 of these undefined bytes, as the truncated buffer is detected
187 immediately following the read based on the calculated
188 starting position of the coefficient partition.
190 - Fix potential error concealment crash when the very first frame
191 is missing or corrupt (a609be5)
193 - Fix significant artifacts in error concealment (a4c2211, 99d870a)
195 - Revert 1-pass CBR rate control changes (e961317)
196 Further testing showed this change produced undesirable visual
197 artifacts, rolling back for now.
200 2011-08-02 v0.9.7 "Cayuga"
201 Our third named release, focused on a faster, higher quality, encoder.
204 This release is backwards compatible with Aylesbury (v0.9.5) and
205 Bali (v0.9.6). Users of older releases should refer to the Upgrading
206 notes in this document for that release.
209 Stereo 3D format support for vpxenc
210 Runtime detection of available processor cores.
211 Allow specifying --end-usage by enum name
212 vpxdec: test for frame corruption
213 vpxenc: add quantizer histogram display
214 vpxenc: add rate histogram display
215 Set VPX_FRAME_IS_DROPPABLE
216 update configure for ios sdk 4.3
217 Avoid text relocations in ARM vp8 decoder
218 Generate a vpx.pc file for pkg-config.
219 New ways of passing encoded data between encoder and decoder.
222 This release includes across-the-board speed improvements to the
223 encoder. On x86, these measure at approximately 11.5% in Best mode,
224 21.5% in Good mode (speed 0), and 22.5% in Realtime mode (speed 6).
225 On ARM Cortex A9 with Neon extensions, real-time encoding of video
226 telephony content is 35% faster than Bali on single core and 48%
227 faster on multi-core. On the NVidia Tegra2 platform, real time
228 encoding is 40% faster than Bali.
230 Decoder speed was not a priority for this release, but improved
231 approximately 8.4% on x86.
233 Reduce motion vector search on alt-ref frame.
234 Encoder loopfilter running in its own thread
235 Reworked loopfilter to precalculate more parameters
236 SSE2/SSSE3 optimizations for build_predictors_mbuv{,_s}().
237 Make hor UV predict ~2x faster (73 vs 132 cycles) using SSSE3.
238 Removed redundant checks
239 Reduced structure sizes
240 utilize preload in ARMv6 MC/LPF/Copy routines
241 ARM optimized quantization, dfct, variance, subtract
242 Increase chrow row alignment to 16 bytes.
243 disable trellis optimization for first pass
244 Write SSSE3 sub-pixel filter function
245 Improve SSE2 half-pixel filter funtions
246 Add vp8_sub_pixel_variance16x8_ssse3 function
247 Reduce unnecessary distortion computation
248 Use diamond search to replace full search
249 Preload reference area in sub-pixel motion search (real-time mode)
252 This release focused primarily on one-pass use cases, including
253 video conferencing. Low latency data rate control was significantly
254 improved, improving streamability over bandwidth constrained links.
255 Added support for error concealment, allowing frames to maintain
256 visual quality in the presence of substantial packet loss.
258 Add rc_max_intra_bitrate_pct control
259 Limit size of initial keyframe in one-pass.
260 Improve framerate adaptation
261 Improved 1-pass CBR rate control
262 Improved KF insertion after fades to still.
263 Improved key frame detection.
264 Improved activity masking (lower PSNR impact for same SSIM boost)
265 Improved interaction between GF and ARFs
266 Adding error-concealment to the decoder.
267 Adding support for independent partitions
268 Adjusted rate-distortion constants
272 Removed firstpass motion map
273 Fix parallel make install
274 Fix multithreaded encoding for 1 MB wide frame
275 Fixed iwalsh_neon build problems with RVDS4.1
276 Fix semaphore emulation, spin-wait intrinsics on Windows
277 Fix build with xcode4 and simplify GLOBAL.
278 Mark ARM asm objects as allowing a non-executable stack.
279 Fix vpxenc encoding incorrect webm file header on big endian
282 2011-03-07 v0.9.6 "Bali"
283 Our second named release, focused on a faster, higher quality, encoder.
286 This release is backwards compatible with Aylesbury (v0.9.5). Users
287 of older releases should refer to the Upgrading notes in this
288 document for that release.
291 vpxenc --psnr shows a summary when encode completes
292 --tune=ssim option to enable activity masking
293 improved postproc visualizations for development
294 updated support for Apple iOS to SDK 4.2
295 query decoder to determine which reference frames were updated
296 implemented error tracking in the decoder
297 fix pipe support on windows
300 Primary focus was on good quality mode, speed 0. Average improvement
301 on x86 about 40%, up to 100% on user-generated content at that speed.
302 Best quality mode speed improved 35%, and realtime speed 10-20%. This
303 release also saw significant improvement in realtime encoding speed
306 Improved encoder threading
307 Dont pick encoder filter level when loopfilter is disabled.
308 Avoid double copying of key frames into alt and golden buffer
310 x86 sse2 temporal filter
311 SSSE3 version of fast quantizer
312 vp8_rd_pick_best_mbsegmentation code restructure
313 Adjusted breakout RD for SPLITMV
314 Changed segmentation check order
315 Improved rd_pick_intra4x4block
316 Adds armv6 optimized variance calculation
317 ARMv6 optimized sad16x16
318 ARMv6 optimized half pixel variance calculations
319 Full search SAD function optimization in SSE4.1
320 Improve MV prediction accuracy to achieve performance gain
321 Improve MV prediction in vp8_pick_inter_mode() for speed>3
324 Best quality mode improved PSNR 6.3%, and SSIM 6.1%. This release
325 also includes support for "activity masking," which greatly improves
326 SSIM at the expense of PSNR. For now, this feature is available with
327 the --tune=ssim option. Further experimentation in this area
328 is ongoing. This release also introduces a new rate control mode
329 called "CQ," which changes the allocation of bits within a clip to
330 the sections where they will have the most visual impact.
332 Tuning for the more exact quantizer.
333 Relax rate control for last few frames
335 Limit key frame quantizer for forced key frames.
337 Add simple version of activity masking.
338 make rdmult adaptive for intra in quantizer RDO
339 cap the best quantizer for 2nd order DC
340 change the threshold of DC check for encode breakout
343 Fix crash on Sparc Solaris.
344 Fix counter of fixed keyframe distance
345 ARNR filter pointer update bug fix
346 Fixed use of motion percentage in KF/GF group calc
347 Changed condition for using RD in Intra Mode
348 Fix encoder real-time only configuration.
349 Fix ARM encoder crash with multiple token partitions
350 Fixed bug first cluster timecode of webm file is wrong.
351 Fixed various encoder bugs with odd-sized images
352 vp8e_get_preview fixed when spatial resampling enabled
353 quantizer: fix assertion in fast quantizer path
354 Allocate source buffers to be multiples of 16
355 Fix for manual Golden frame frequency
356 Fix drastic undershoot in long form content
359 2010-10-28 v0.9.5 "Aylesbury"
360 Our first named release, focused on a faster decoder, and a better encoder.
363 This release incorporates backwards-incompatible changes to the
364 ivfenc and ivfdec tools. These tools are now called vpxenc and vpxdec.
367 * the -q (quiet) option has been removed, and replaced with
368 -v (verbose). the output is quiet by default. Use -v to see
369 the version number of the binary.
371 * The default behavior is now to write output to a single file
372 instead of individual frames. The -y option has been removed.
373 Y4M output is the default.
375 * For raw I420/YV12 output instead of Y4M, the --i420 or --yv12
376 options must be specified.
378 $ ivfdec -o OUTPUT INPUT
379 $ vpxdec --i420 -o OUTPUT INPUT
381 * If an output file is not specified, the default is to write
382 Y4M to stdout. This makes piping more natural.
384 $ ivfdec -y -o - INPUT | ...
387 * The output file has additional flexibility for formatting the
388 filename. It supports escape characters for constructing a
389 filename from the width, height, and sequence number. This
390 replaces the -p option. To get the equivalent:
392 $ ivfdec -p frame INPUT
393 $ vpxdec --i420 -o frame-%wx%h-%4.i420 INPUT
396 * The output file must be specified with -o, rather than as the
399 $ ivfenc <options> INPUT OUTPUT
400 $ vpxenc <options> -o OUTPUT INPUT
402 * The output defaults to webm. To get IVF output, use the --ivf
405 $ ivfenc <options> INPUT OUTPUT.ivf
406 $ vpxenc <options> -o OUTPUT.ivf --ivf INPUT
410 ivfenc and ivfdec have been renamed to vpxenc, vpxdec.
411 vpxdec supports .webm input
412 vpxdec writes .y4m by default
413 vpxenc writes .webm output by default
414 vpxenc --psnr now shows the average/overall PSNR at the end
415 ARM platforms now support runtime cpu detection
416 vpxdec visualizations added for motion vectors, block modes, references
417 vpxdec now silent by default
418 vpxdec --progress shows frame-by-frame timing information
419 vpxenc supports the distinction between --fps and --timebase
420 NASM is now a supported assembler
421 configure: enable PIC for shared libs by default
422 configure: add --enable-small
423 configure: support for ppc32-linux-gcc
424 configure: support for sparc-solaris-gcc
427 Improve handling of invalid frames
428 Fix valgrind errors in the NEON loop filters.
429 Fix loopfilter delta zero transitions
430 Fix valgrind errors in vp8_sixtap_predict8x4_armv6().
431 Build fixes for darwin-icc
434 20-40% (average 28%) improvement in libvpx decoder speed,
436 Rewrite vp8_short_walsh4x4_sse2()
437 Optimizations on the loopfilters.
438 Miscellaneous improvements for Atom
439 Add 4-tap version of 2nd-pass ARMv6 MC filter.
440 Improved multithread utilization
441 Better instruction choices on x86
442 reorder data to use wider instructions
443 Update NEON wide idcts
444 Make block access to frame buffer sequential
445 Improved subset block search
446 Bilinear subpixel optimizations for ssse3.
447 Decrease memory footprint
449 Encoder speed improvements (percentage gain not measured):
450 Skip unnecessary search of identical frames
451 Add SSE2 subtract functions
452 Improve bounds checking in vp8_diamond_search_sadx4()
453 Added vp8_fast_quantize_b_sse2
456 Over 7% overall PSNR improvement (6.3% SSIM) in "best" quality
457 encoding mode, and up to 60% improvement on very noisy, still
458 or slow moving source video
460 Motion compensated temporal filter for Alt-Ref Noise Reduction
461 Improved use of trellis quantization on 2nd order Y blocks
462 Tune effect of motion on KF/GF boost in two pass
463 Allow coefficient optimization for good quality speed 0.
464 Improved control of active min quantizer for two pass.
465 Enable ARFs for non-lagged compress
469 Disable frame dropping by default
470 Improved multithreaded performance
471 Improved Force Key Frame Behaviour
472 Increased rate control buffer level precision
473 Fix bug in 1st pass motion compensation
474 ivfenc: correct fixed kf interval, --disable-kf
476 Changed above and left context data layout
477 Rework idct calling structure.
478 Removed unnecessary MB_MODE_INFO copies
479 x86: SSSE3 sixtap prediction
480 Reworked IDCT to include reconstruction (add) step
481 Swap alt/gold/new/last frame buffer ptrs instead of copying.
482 Improve SSE2 loopfilter functions
483 Change bitreader to use a larger window.
484 Avoid loopfilter reinitialization when possible
486 Normalize quantizer's zero bin and rounding factors
487 Add trellis quantization.
488 Make the quantizer exact.
489 Updates to ARNR filtering algorithm
490 Fix breakout thresh computation for golden & AltRef frames
491 Redo the forward 4x4 dct
492 Improve the accuracy of forward walsh-hadamard transform
493 Further adjustment of RD behaviour with Q and Zbin.
495 Allow linking of libs built with MinGW to MSVC
496 Fix target auto-detection on mingw32
497 Allow --cpu= to work for x86.
498 configure: pass original arguments through to make dist
499 Fix builds without runtime CPU detection
500 msvs: fix install of codec sources
501 msvs: Change devenv.com command line for better msys support
502 msvs: Add vs9 targets.
503 Add x86_64-linux-icc target
505 Potential crashes on older MinGW builds
506 Fix two-pass framrate for Y4M input.
507 Fixed simple loop filter, other crashes on ARM v6
508 arm: fix missing dependency with --enable-shared
509 configure: support directories containing .o
510 Replace pinsrw (SSE) with MMX instructions
511 apple: include proper mach primatives
512 Fixed rate control bug with long key frame interval.
513 Fix DSO link errors on x86-64 when not using a version script
514 Fixed buffer selection for UV in AltRef filtering
519 * ivfenc/ivfdec now support YUV4MPEG2 input and pipe I/O
520 * Speed optimizations
523 * Prevent out-of-bounds accesses on invalid data
524 - Build system updates:
525 * Detect toolchain to be used automatically for native builds
526 * Support building shared libraries
527 * Better autotools emulation (--prefix, --libdir, DESTDIR)
529 * http://webmproject.blogspot.com/2010/06/changes-to-webm-open-source-license.html
533 - Initial open source release. Welcome to WebM and VP8!
projects / libvpx / blob