1 2012-05-09 v1.1.0 "Eider" 2 This introduces a number of enhancements, mostly focused on real-time 3 encoding. In addition, it fixes a decoder bug (first introduced in 4 Duclair) so all users of that release are encouraged to upgrade. 5 6 - Upgrading: 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. 10 11 This release introduces a new temporal denoiser, controlled by the 12 VP8E_SET_NOISE_SENSITIVITY control. The temporal denoiser does not 13 currently take a strength parameter, so the control is effectively 14 a boolean - zero (off) or non-zero (on). For compatibility with 15 existing applications, the values accepted are the same as those 16 for the spatial denoiser (0-6). The temporal denoiser is enabled 17 by default, and the older spatial denoiser may be restored by 18 configuring with --disable-temporal-denoising. The temporal denoiser 19 is more computationally intensive than the spatial one. 20 21 This release removes support for a legacy, decode only API that was 22 supported, but deprecated, at the initial release of libvpx 23 (v0.9.0). This is not expected to have any impact. If you are 24 impacted, you can apply a reversion to commit 2bf8fb58 locally. 25 Please update to the latest libvpx API if you are affected. 26 27 - Enhancements: 28 Adds a motion compensated temporal denoiser to the encoder, which 29 gives higher quality than the older spatial denoiser. (See above 30 for notes on upgrading). 31 32 In addition, support for new compilers and platforms were added, 33 including: 34 improved support for XCode 35 Android x86 NDK build 36 OS/2 support 37 SunCC support 38 39 Changing resolution with vpx_codec_enc_config_set() is now 40 supported. Previously, reinitializing the codec was required to 41 change the input resolution. 42 43 The vpxenc application has initial support for producing multiple 44 encodes from the same input in one call. Resizing is not yet 45 supported, but varying other codec parameters is. Use -- to 46 delineate output streams. Options persist from one stream to the 47 next. 48 49 Also, the vpxenc application will now use a keyframe interval of 50 5 seconds by default. Use the --kf-max-dist option to override. 51 52 - Speed: 53 Decoder performance improved 2.5% versus Duclair. Encoder speed is 54 consistent with Duclair for most material. Two pass encoding of 55 slideshow-like material will see significant improvements. 56 57 Large realtime encoding speed gains at a small quality expense are 58 possible by configuring the on-the-fly bitpacking experiment with 59 --enable-onthefly-bitpacking. Realtime encoder can be up to 13% 60 faster (ARM) depending on the number of threads and bitrate 61 settings. This technique sees constant gain over the 5-16 speed 62 range. For VC style input the loss seen is up to 0.2dB. See commit 63 52cf4dca for further details. 64 65 - Quality: 66 On the whole, quality is consistent with the Duclair release. Some 67 tweaks: 68 69 Reduced blockiness in easy sections by applying a penalty to 70 intra modes. 71 72 Improved quality of static sections (like slideshows) with 73 two pass encoding. 74 75 Improved keyframe sizing with multiple temporal layers 76 77 - Bug Fixes: 78 Corrected alt-ref contribution to frame rate for visible updates 79 to the alt-ref buffer. This affected applications making manual 80 usage of the frame reference flags, or temporal layers. 81 82 Additional constraints were added to disable multi-frame quality 83 enhancement (MFQE) in sections of the frame where there is motion. 84 (#392) 85 86 Fixed corruption issues when vpx_codec_enc_config_set() was called 87 with spatial resampling enabled. 88 89 Fixed a decoder error introduced in Duclair where the segmentation 90 map was not being reinitialized on keyframes (#378) 91 92 93 2012-01-27 v1.0.0 "Duclair" 94 Our fourth named release, focused on performance and features related to 95 real-time encoding. It also fixes a decoder crash bug introduced in 96 v0.9.7, so all users of that release are encouraged to upgrade. 97 98 - Upgrading: 99 This release is ABI incompatible with prior releases of libvpx, so the 100 "major" version number has been bumped to 1. You must recompile your 101 applications against the latest version of the libvpx headers. The 102 API remains compatible, and this should not require code changes in most 103 applications. 104 105 - Enhancements: 106 This release introduces several substantial new features to the encoder, 107 of particular interest to real time streaming applications. 108 109 Temporal scalability allows the encoder to produce a stream that can 110 be decimated to different frame rates, with independent rate targetting 111 for each substream. 112 113 Multiframe quality enhancement postprocessing can make visual quality 114 more consistent in the presence of frames that are substantially 115 different quality than the surrounding frames, as in the temporal 116 scalability case and in some forced keyframe scenarios. 117 118 Multiple-resolution encoding support allows the encoding of the 119 same content at different resolutions faster than encoding them 120 separately. 121 122 - Speed: 123 Optimization targets for this release included the decoder and the real- 124 time modes of the encoder. Decoder speed on x86 has improved 10.5% with 125 this release. Encoder improvements followed a curve where speeds 1-3 126 improved 4.0%-1.5%, speeds 4-8 improved <1%, and speeds 9-16 improved 127 1.5% to 10.5%, respectively. "Best" mode speed is consistent with the 128 Cayuga release. 129 130 - Quality: 131 Encoder quality in the single stream case is consistent with the Cayuga 132 release. 133 134 - Bug Fixes: 135 This release fixes an OOB read decoder crash bug present in v0.9.7 136 related to the clamping of motion vectors in SPLITMV blocks. This 137 behavior could be triggered by corrupt input or by starting 138 decoding from a P-frame. 139 140 141 2011-08-15 v0.9.7-p1 "Cayuga" patch 1 142 This is an incremental bugfix release against Cayuga. All users of that 143 release are strongly encouraged to upgrade. 144 145 - Fix potential OOB reads (cdae03a) 146 147 An unbounded out of bounds read was discovered when the 148 decoder was requested to perform error concealment (new in 149 Cayuga) given a frame with corrupt partition sizes. 150 151 A bounded out of bounds read was discovered affecting all 152 versions of libvpx. Given an multipartition input frame that 153 is truncated between the mode/mv partition and the first 154 residiual paritition (in the block of partition offsets), up 155 to 3 extra bytes could have been read from the source buffer. 156 The code will not take any action regardless of the contents 157 of these undefined bytes, as the truncated buffer is detected 158 immediately following the read based on the calculated 159 starting position of the coefficient partition. 160 161 - Fix potential error concealment crash when the very first frame 162 is missing or corrupt (a609be5) 163 164 - Fix significant artifacts in error concealment (a4c2211, 99d870a) 165 166 - Revert 1-pass CBR rate control changes (e961317) 167 Further testing showed this change produced undesirable visual 168 artifacts, rolling back for now. 169 170 171 2011-08-02 v0.9.7 "Cayuga" 172 Our third named release, focused on a faster, higher quality, encoder. 173 174 - Upgrading: 175 This release is backwards compatible with Aylesbury (v0.9.5) and 176 Bali (v0.9.6). Users of older releases should refer to the Upgrading 177 notes in this document for that release. 178 179 - Enhancements: 180 Stereo 3D format support for vpxenc 181 Runtime detection of available processor cores. 182 Allow specifying --end-usage by enum name 183 vpxdec: test for frame corruption 184 vpxenc: add quantizer histogram display 185 vpxenc: add rate histogram display 186 Set VPX_FRAME_IS_DROPPABLE 187 update configure for ios sdk 4.3 188 Avoid text relocations in ARM vp8 decoder 189 Generate a vpx.pc file for pkg-config. 190 New ways of passing encoded data between encoder and decoder. 191 192 - Speed: 193 This release includes across-the-board speed improvements to the 194 encoder. On x86, these measure at approximately 11.5% in Best mode, 195 21.5% in Good mode (speed 0), and 22.5% in Realtime mode (speed 6). 196 On ARM Cortex A9 with Neon extensions, real-time encoding of video 197 telephony content is 35% faster than Bali on single core and 48% 198 faster on multi-core. On the NVidia Tegra2 platform, real time 199 encoding is 40% faster than Bali. 200 201 Decoder speed was not a priority for this release, but improved 202 approximately 8.4% on x86. 203 204 Reduce motion vector search on alt-ref frame. 205 Encoder loopfilter running in its own thread 206 Reworked loopfilter to precalculate more parameters 207 SSE2/SSSE3 optimizations for build_predictors_mbuv{,_s}(). 208 Make hor UV predict ~2x faster (73 vs 132 cycles) using SSSE3. 209 Removed redundant checks 210 Reduced structure sizes 211 utilize preload in ARMv6 MC/LPF/Copy routines 212 ARM optimized quantization, dfct, variance, subtract 213 Increase chrow row alignment to 16 bytes. 214 disable trellis optimization for first pass 215 Write SSSE3 sub-pixel filter function 216 Improve SSE2 half-pixel filter funtions 217 Add vp8_sub_pixel_variance16x8_ssse3 function 218 Reduce unnecessary distortion computation 219 Use diamond search to replace full search 220 Preload reference area in sub-pixel motion search (real-time mode) 221 222 - Quality: 223 This release focused primarily on one-pass use cases, including 224 video conferencing. Low latency data rate control was significantly 225 improved, improving streamability over bandwidth constrained links. 226 Added support for error concealment, allowing frames to maintain 227 visual quality in the presence of substantial packet loss. 228 229 Add rc_max_intra_bitrate_pct control 230 Limit size of initial keyframe in one-pass. 231 Improve framerate adaptation 232 Improved 1-pass CBR rate control 233 Improved KF insertion after fades to still. 234 Improved key frame detection. 235 Improved activity masking (lower PSNR impact for same SSIM boost) 236 Improved interaction between GF and ARFs 237 Adding error-concealment to the decoder. 238 Adding support for independent partitions 239 Adjusted rate-distortion constants 240 241 242 - Bug Fixes: 243 Removed firstpass motion map 244 Fix parallel make install 245 Fix multithreaded encoding for 1 MB wide frame 246 Fixed iwalsh_neon build problems with RVDS4.1 247 Fix semaphore emulation, spin-wait intrinsics on Windows 248 Fix build with xcode4 and simplify GLOBAL. 249 Mark ARM asm objects as allowing a non-executable stack. 250 Fix vpxenc encoding incorrect webm file header on big endian 251 252 253 2011-03-07 v0.9.6 "Bali" 254 Our second named release, focused on a faster, higher quality, encoder. 255 256 - Upgrading: 257 This release is backwards compatible with Aylesbury (v0.9.5). Users 258 of older releases should refer to the Upgrading notes in this 259 document for that release. 260 261 - Enhancements: 262 vpxenc --psnr shows a summary when encode completes 263 --tune=ssim option to enable activity masking 264 improved postproc visualizations for development 265 updated support for Apple iOS to SDK 4.2 266 query decoder to determine which reference frames were updated 267 implemented error tracking in the decoder 268 fix pipe support on windows 269 270 - Speed: 271 Primary focus was on good quality mode, speed 0. Average improvement 272 on x86 about 40%, up to 100% on user-generated content at that speed. 273 Best quality mode speed improved 35%, and realtime speed 10-20%. This 274 release also saw significant improvement in realtime encoding speed 275 on ARM platforms. 276 277 Improved encoder threading 278 Dont pick encoder filter level when loopfilter is disabled. 279 Avoid double copying of key frames into alt and golden buffer 280 FDCT optimizations. 281 x86 sse2 temporal filter 282 SSSE3 version of fast quantizer 283 vp8_rd_pick_best_mbsegmentation code restructure 284 Adjusted breakout RD for SPLITMV 285 Changed segmentation check order 286 Improved rd_pick_intra4x4block 287 Adds armv6 optimized variance calculation 288 ARMv6 optimized sad16x16 289 ARMv6 optimized half pixel variance calculations 290 Full search SAD function optimization in SSE4.1 291 Improve MV prediction accuracy to achieve performance gain 292 Improve MV prediction in vp8_pick_inter_mode() for speed>3 293 294 - Quality: 295 Best quality mode improved PSNR 6.3%, and SSIM 6.1%. This release 296 also includes support for "activity masking," which greatly improves 297 SSIM at the expense of PSNR. For now, this feature is available with 298 the --tune=ssim option. Further experimentation in this area 299 is ongoing. This release also introduces a new rate control mode 300 called "CQ," which changes the allocation of bits within a clip to 301 the sections where they will have the most visual impact. 302 303 Tuning for the more exact quantizer. 304 Relax rate control for last few frames 305 CQ Mode 306 Limit key frame quantizer for forced key frames. 307 KF/GF Pulsing 308 Add simple version of activity masking. 309 make rdmult adaptive for intra in quantizer RDO 310 cap the best quantizer for 2nd order DC 311 change the threshold of DC check for encode breakout 312 313 - Bug Fixes: 314 Fix crash on Sparc Solaris. 315 Fix counter of fixed keyframe distance 316 ARNR filter pointer update bug fix 317 Fixed use of motion percentage in KF/GF group calc 318 Changed condition for using RD in Intra Mode 319 Fix encoder real-time only configuration. 320 Fix ARM encoder crash with multiple token partitions 321 Fixed bug first cluster timecode of webm file is wrong. 322 Fixed various encoder bugs with odd-sized images 323 vp8e_get_preview fixed when spatial resampling enabled 324 quantizer: fix assertion in fast quantizer path 325 Allocate source buffers to be multiples of 16 326 Fix for manual Golden frame frequency 327 Fix drastic undershoot in long form content 328 329 330 2010-10-28 v0.9.5 "Aylesbury" 331 Our first named release, focused on a faster decoder, and a better encoder. 332 333 - Upgrading: 334 This release incorporates backwards-incompatible changes to the 335 ivfenc and ivfdec tools. These tools are now called vpxenc and vpxdec. 336 337 vpxdec 338 * the -q (quiet) option has been removed, and replaced with 339 -v (verbose). the output is quiet by default. Use -v to see 340 the version number of the binary. 341 342 * The default behavior is now to write output to a single file 343 instead of individual frames. The -y option has been removed. 344 Y4M output is the default. 345 346 * For raw I420/YV12 output instead of Y4M, the --i420 or --yv12 347 options must be specified. 348 349 $ ivfdec -o OUTPUT INPUT 350 $ vpxdec --i420 -o OUTPUT INPUT 351 352 * If an output file is not specified, the default is to write 353 Y4M to stdout. This makes piping more natural. 354 355 $ ivfdec -y -o - INPUT | ... 356 $ vpxdec INPUT | ... 357 358 * The output file has additional flexibility for formatting the 359 filename. It supports escape characters for constructing a 360 filename from the width, height, and sequence number. This 361 replaces the -p option. To get the equivalent: 362 363 $ ivfdec -p frame INPUT 364 $ vpxdec --i420 -o frame-%wx%h-%4.i420 INPUT 365 366 vpxenc 367 * The output file must be specified with -o, rather than as the 368 last argument. 369 370 $ ivfenc <options> INPUT OUTPUT 371 $ vpxenc <options> -o OUTPUT INPUT 372 373 * The output defaults to webm. To get IVF output, use the --ivf 374 option. 375 376 $ ivfenc <options> INPUT OUTPUT.ivf 377 $ vpxenc <options> -o OUTPUT.ivf --ivf INPUT 378 379 380 - Enhancements: 381 ivfenc and ivfdec have been renamed to vpxenc, vpxdec. 382 vpxdec supports .webm input 383 vpxdec writes .y4m by default 384 vpxenc writes .webm output by default 385 vpxenc --psnr now shows the average/overall PSNR at the end 386 ARM platforms now support runtime cpu detection 387 vpxdec visualizations added for motion vectors, block modes, references 388 vpxdec now silent by default 389 vpxdec --progress shows frame-by-frame timing information 390 vpxenc supports the distinction between --fps and --timebase 391 NASM is now a supported assembler 392 configure: enable PIC for shared libs by default 393 configure: add --enable-small 394 configure: support for ppc32-linux-gcc 395 configure: support for sparc-solaris-gcc 396 397 - Bugs: 398 Improve handling of invalid frames 399 Fix valgrind errors in the NEON loop filters. 400 Fix loopfilter delta zero transitions 401 Fix valgrind errors in vp8_sixtap_predict8x4_armv6(). 402 Build fixes for darwin-icc 403 404 - Speed: 405 20-40% (average 28%) improvement in libvpx decoder speed, 406 including: 407 Rewrite vp8_short_walsh4x4_sse2() 408 Optimizations on the loopfilters. 409 Miscellaneous improvements for Atom 410 Add 4-tap version of 2nd-pass ARMv6 MC filter. 411 Improved multithread utilization 412 Better instruction choices on x86 413 reorder data to use wider instructions 414 Update NEON wide idcts 415 Make block access to frame buffer sequential 416 Improved subset block search 417 Bilinear subpixel optimizations for ssse3. 418 Decrease memory footprint 419 420 Encoder speed improvements (percentage gain not measured): 421 Skip unnecessary search of identical frames 422 Add SSE2 subtract functions 423 Improve bounds checking in vp8_diamond_search_sadx4() 424 Added vp8_fast_quantize_b_sse2 425 426 - Quality: 427 Over 7% overall PSNR improvement (6.3% SSIM) in "best" quality 428 encoding mode, and up to 60% improvement on very noisy, still 429 or slow moving source video 430 431 Motion compensated temporal filter for Alt-Ref Noise Reduction 432 Improved use of trellis quantization on 2nd order Y blocks 433 Tune effect of motion on KF/GF boost in two pass 434 Allow coefficient optimization for good quality speed 0. 435 Improved control of active min quantizer for two pass. 436 Enable ARFs for non-lagged compress 437 438 2010-09-02 v0.9.2 439 - Enhancements: 440 Disable frame dropping by default 441 Improved multithreaded performance 442 Improved Force Key Frame Behaviour 443 Increased rate control buffer level precision 444 Fix bug in 1st pass motion compensation 445 ivfenc: correct fixed kf interval, --disable-kf 446 - Speed: 447 Changed above and left context data layout 448 Rework idct calling structure. 449 Removed unnecessary MB_MODE_INFO copies 450 x86: SSSE3 sixtap prediction 451 Reworked IDCT to include reconstruction (add) step 452 Swap alt/gold/new/last frame buffer ptrs instead of copying. 453 Improve SSE2 loopfilter functions 454 Change bitreader to use a larger window. 455 Avoid loopfilter reinitialization when possible 456 - Quality: 457 Normalize quantizer's zero bin and rounding factors 458 Add trellis quantization. 459 Make the quantizer exact. 460 Updates to ARNR filtering algorithm 461 Fix breakout thresh computation for golden & AltRef frames 462 Redo the forward 4x4 dct 463 Improve the accuracy of forward walsh-hadamard transform 464 Further adjustment of RD behaviour with Q and Zbin. 465 - Build System: 466 Allow linking of libs built with MinGW to MSVC 467 Fix target auto-detection on mingw32 468 Allow --cpu= to work for x86. 469 configure: pass original arguments through to make dist 470 Fix builds without runtime CPU detection 471 msvs: fix install of codec sources 472 msvs: Change devenv.com command line for better msys support 473 msvs: Add vs9 targets. 474 Add x86_64-linux-icc target 475 - Bugs: 476 Potential crashes on older MinGW builds 477 Fix two-pass framrate for Y4M input. 478 Fixed simple loop filter, other crashes on ARM v6 479 arm: fix missing dependency with --enable-shared 480 configure: support directories containing .o 481 Replace pinsrw (SSE) with MMX instructions 482 apple: include proper mach primatives 483 Fixed rate control bug with long key frame interval. 484 Fix DSO link errors on x86-64 when not using a version script 485 Fixed buffer selection for UV in AltRef filtering 486 487 488 2010-06-17 v0.9.1 489 - Enhancements: 490 * ivfenc/ivfdec now support YUV4MPEG2 input and pipe I/O 491 * Speed optimizations 492 - Bugfixes: 493 * Rate control 494 * Prevent out-of-bounds accesses on invalid data 495 - Build system updates: 496 * Detect toolchain to be used automatically for native builds 497 * Support building shared libraries 498 * Better autotools emulation (--prefix, --libdir, DESTDIR) 499 - Updated LICENSE 500 * http://webmproject.blogspot.com/2010/06/changes-to-webm-open-source-license.html 501 502 503 2010-05-18 v0.9.0 504 - Initial open source release. Welcome to WebM and VP8! 505 506
