1 Entries are sorted chronologically from oldest to youngest within each release,
2 releases are sorted from youngest to oldest.
7 - DTS lossless extension (XLL) decoding (not lossless, disabled by default)
10 - Drop support for nvenc API before 5.0
19 - RIFX format for *.wav files
21 - non continuous cache protocol support
23 - cropdetect support for non 8bpp, absolute (if limit >= 1) and relative (if limit < 1.0) threshold
24 - Camellia symmetric block cipher
25 - OpenH264 encoder wrapper
27 - Closed caption Decoder
28 - fspp, uspp, pp7 MPlayer postprocessing filters ported to native filters
30 - Twofish symmetric block cipher
31 - Support DNx100 (960x720@8)
32 - eq2 filter ported from libmpcodecs as eq filter
34 - Changed default DNxHD colour range in QuickTime .mov derivatives to mpeg range
35 - ported softpulldown filter from libmpcodecs as repeatfields filter
37 - RTP depacketizer for loss tolerant payload format for MP3 audio (RFC 5219)
38 - RTP depacketizer for AC3 payload format (RFC 4184)
39 - palettegen and paletteuse filters
40 - VP9 RTP payload format (draft 0) experimental depacketizer
41 - RTP depacketizer for DV (RFC 6469)
42 - DXVA2-accelerated HEVC decoding
43 - AAC ELD 480 decoding
44 - Intel QSV-accelerated H.264 decoding
45 - DSS SP decoder and DSS demuxer
46 - Fix stsd atom corruption in DNxHD QuickTimes
48 - RTP depacketization of T.140 text (RFC 4103)
49 - Port MIPS optimizations to 64-bit
53 - HEVC/H.265 RTP payload format (draft v6) packetizer
54 - SUP/PGS subtitle demuxer
55 - ffprobe -show_pixel_formats option
56 - CAST128 symmetric block cipher, ECB mode
57 - STL subtitle demuxer and decoder
58 - libutvideo YUV 4:2:2 10bit support
59 - XCB-based screen-grabber
60 - UDP-Lite support (RFC 3828)
62 - AVFoundation screen capturing support
63 - ffserver supports codec private options
64 - creating DASH compatible fragmented MP4, MPEG-DASH segmenting muxer
65 - WebP muxer with animated WebP support
66 - zygoaudio decoding support
68 - postproc visualization support
73 - ported lenscorrection filter from frei0r filter
74 - large optimizations in dctdnoiz to make it usable
75 - ICY metadata are now requested by default with the HTTP protocol
76 - support for using metadata in stream specifiers in fftools
77 - LZMA compression support in TIFF decoder
78 - H.261 RTP payload format (RFC 4587) depacketizer and experimental packetizer
79 - HEVC/H.265 RTP payload format (draft v6) depacketizer
80 - added codecview filter to visualize information exported by some codecs
81 - Matroska 3D support thorugh side data
82 - HTML generation using texi2html is deprecated in favor of makeinfo/texi2any
83 - silenceremove filter
87 - AC3 fixed-point decoding
88 - shuffleplanes filter
90 - Phantom Cine demuxer
91 - replaygain data export
93 - Alias PIX image encoder and decoder
94 - Improvements to the BRender PIX image decoder
95 - Improvements to the XBM decoder
97 - improvements to OpenEXR image decoder
98 - support decoding 16-bit RLE SGI images
99 - GDI screen grabbing for Windows
100 - alternative rendition support for HTTP Live Streaming
101 - AVFoundation input device
102 - Direct Stream Digital (DSD) decoder
103 - Magic Lantern Video (MLV) demuxer
104 - On2 AVC (Audio for Video) decoder
105 - support for decoding through DXVA2 in ffmpeg
106 - libbs2b-based stereo-to-binaural audio filter
107 - libx264 reference frames count limiting depending on level
108 - native Opus decoder
109 - display matrix export and rotation API
111 - showcqt multimedia filter
114 - hqx filter (hq2x, hq3x, hq4x)
116 - Image format auto-detection
117 - LRC demuxer and muxer
118 - Samba protocol (via libsmbclient)
119 - WebM DASH Manifest muxer
120 - libfribidi support in drawtext
125 - HNM version 4 demuxer and video decoder
127 - setsar/setdar filters now support variables in ratio expressions
129 - string validation in ffprobe
130 - support for decoding through VDPAU in ffmpeg (the -hwaccel option)
131 - complete Voxware MetaSound decoder
132 - remove mp3_header_compress bitstream filter
133 - Windows resource files for shared libraries
135 - stereoscopic 3d metadata handling
136 - WebP encoding via libwebp
138 - VP8 in Ogg demuxing
139 - side & metadata support in NUT
141 - XYZ12 rawvideo support in NUT
142 - Exif metadata support in WebP decoder
144 - Use metadata_header_padding to control padding in ID3 tags (currently used in
145 MP3, AIFF, and OMA files), FLAC header, and the AVI "junk" block.
146 - Mirillis FIC video decoder
150 - Autodetect VDA like all other hardware accelerations
151 - aliases and defaults for Ogg subtypes (opus, spx)
157 - perspective filter ported from libmpcodecs
158 - ffprobe -show_programs option
161 - when transcoding with ffmpeg (i.e. not streamcopying), -ss is now accurate
162 even when used as an input option. Previous behavior can be restored with
163 the -noaccurate_seek option.
164 - ffmpeg -t option can now be used for inputs, to limit the duration of
165 data read from an input file
166 - incomplete Voxware MetaSound decoder
167 - read EXIF metadata from JPEG
168 - DVB teletext decoder
169 - phase filter ported from libmpcodecs
171 - Opus support in Matroska
172 - FFV1 version 1.3 is stable and no longer experimental
173 - FFV1: YUVA(444,422,420) 9, 10 and 16 bit support
174 - changed DTS stream id in lavf mpeg ps muxer from 0x8a to 0x88, to be
175 more consistent with other muxers.
177 - pullup filter ported from libmpcodecs
178 - ffprobe -read_intervals option
179 - Lossless and alpha support for WebP decoder
180 - Error Resilient AAC syntax (ER AAC LC) decoding
181 - Low Delay AAC (ER AAC LD) decoding
182 - mux chapters in ASF files
183 - SFTP protocol (via libssh)
184 - libx264: add ability to encode in YUVJ422P and YUVJ444P
185 - Fraps: use BT.709 colorspace by default for yuv, as reference fraps decoder does
186 - make decoding alpha optional for prores, ffv1 and vp6 by setting
188 - ladspa wrapper filter
191 - max_error_rate parameter in ffmpeg
192 - PulseAudio output device
194 - Enhanced Low Delay AAC (ER AAC ELD) decoding (no LD SBR support)
195 - Linux framebuffer output device
197 - raw HEVC, HEVC in MOV/MP4, HEVC in Matroska, HEVC in MPEG-TS demuxing
204 - reference-counting for AVFrame and AVPacket data
205 - ffmpeg now fails when input options are used for output file
207 - support for Monkey's Audio versions from 3.93
208 - perms and aperms filters
209 - audio filtering support in ffplay
210 - 10% faster aac encoding on x86 and MIPS
211 - sine audio filter source
212 - WebP demuxing and decoding support
213 - ffmpeg options -filter_script and -filter_complex_script, which allow a
214 filtergraph description to be read from a file
216 - audio phaser filter
217 - separatefields filter
219 - uniform options syntax across all filters
223 - inverse telecine filters (fieldmatch and decimate)
224 - colorbalance filter
225 - colorchannelmixer filter
226 - The matroska demuxer can now output proper verbatim ASS packets. It will
227 become the default at the next libavformat major bump.
228 - decent native animated GIF encoding
231 - timeline editing with filters
232 - vidstabdetect and vidstabtransform filters for video stabilization using
235 - trim and atrim filters
236 - ffmpeg -t and -ss (output-only) options are now sample-accurate when
238 - Matroska muxer can now put the index at the beginning of the file.
239 - extractplanes filter
240 - avectorscope filter
245 - ADPCM IMA Radical decoder
247 - DCT denoiser filter (dctdnoiz)
248 - Wavelet denoiser filter ported from libmpcodecs as owdenoise (formerly "ow")
249 - Apple Intermediate Codec decoder
250 - Escape 130 video decoder
251 - FTP protocol support
253 - 3D LUT filter (lut3d)
254 - SMPTE 302M audio encoder
255 - support for slice multithreading in libavfilter
256 - Hald CLUT support (generation and filtering)
257 - VC-1 interlaced B-frame support
258 - support for WavPack muxing (raw and in Matroska)
259 - XVideo output device
261 - True Audio (TTA) encoder
263 - mcdeint filter ported from libmpcodecs
264 - sab filter ported from libmpcodecs
265 - ffprobe -show_chapters option
266 - WavPack encoding through libwavpack
268 - spp filter ported from libmpcodecs
275 - VDPAU hardware acceleration through normal hwaccel
277 - Error diffusion dither in Swscale
278 - Chained Ogg support
279 - Theora Midstream reconfiguration support
282 - filtering audio with unknown channel layout
283 - allpass, bass, bandpass, bandreject, biquad, equalizer, highpass, lowpass
284 and treble audio filter
285 - improved showspectrum filter, with multichannel support and sox-like colors
288 - il filter ported from libmpcodecs
289 - support ID3v2 tags in ASF files
290 - encrypted TTA stream decoding support
291 - RF64 support in WAV muxer
292 - noise filter ported from libmpcodecs
293 - Subtitles character encoding conversion
295 - stereo3d filter ported from libmpcodecs
300 - stream disposition information printing in ffprobe
301 - filter for loudness analysis following EBU R128
302 - Opus encoder using libopus
303 - ffprobe -select_streams option
304 - Pinnacle TARGA CineWave YUV16 decoder
305 - TAK demuxer, decoder and parser
307 - remove -same_quant, it hasn't worked for years
309 - X-Face image encoder and decoder
310 - 24-bit FLAC encoding
311 - multi-channel ALAC encoding up to 7.1
312 - metadata (INFO tag) support in WAV muxer
313 - subtitles raw text decoder
314 - support for building DLLs using MSVC
317 - metadata (info chunk) support in CAF muxer
318 - field filter ported from libmpcodecs
320 - geq filter ported from libmpcodecs
321 - remove ffserver daemon mode
323 - new expansion syntax for drawtext
324 - BRender PIX image decoder
325 - ffprobe -show_entries option
326 - ffprobe -sections option
327 - ADPCM IMA Dialogic decoder
329 - animated GIF decoder and demuxer
332 - IRCAM muxer/demuxer
333 - Paris Audio File demuxer
334 - Virtual concatenation demuxer
336 - JSON captions for TED talks decoding support
337 - SOX Resampler support in libswresample
339 - SGI RLE 8-bit / Silicon Graphics RLE 8-bit video decoder
340 - Silicon Graphics Motion Video Compressor 1 & 2 decoder
341 - Silicon Graphics Movie demuxer
343 - Resolution & pixel format change support with multithreading for H.264
344 - documentation split into per-component manuals
345 - pp (postproc) filter ported from MPlayer
346 - NIST Sphere demuxer
347 - MPL2, VPlayer, MPlayer, AQTitle, PJS and SubViewer v1 subtitles demuxers and decoders
349 - adobe and limelight publisher authentication in RTMP
351 - support building on the Plan 9 operating system
352 - kerndeint filter ported from MPlayer
353 - histeq filter ported from VirtualDub
354 - Megalux Frame demuxer
356 - Improved AVC Intra decoding support
361 - INI and flat output in ffprobe
362 - Scene detection in libavfilter
363 - Indeo Audio decoder
364 - channelsplit audio filter
365 - setnsamples audio filter
367 - ffprobe -show_data option
368 - RTMPT protocol support
369 - iLBC encoding/decoding via libilbc
370 - Microsoft Screen 1 decoder
372 - audio channel mapping filter
373 - Microsoft ATC Screen decoder
375 - TechSmith Screen Codec 2 decoder
376 - AAC encoding via libfdk-aac
377 - Microsoft Expression Encoder Screen decoder
378 - RTMPS protocol support
379 - RTMPTS protocol support
380 - RTMPE protocol support
381 - RTMPTE protocol support
382 - showwaves and showspectrum filter
383 - LucasArts SMUSH SANM playback support
384 - LucasArts SMUSH VIMA audio decoder (ADPCM)
385 - LucasArts SMUSH demuxer
386 - SAMI, RealText and SubViewer demuxers and decoders
387 - Heart Of Darkness PAF playback support
390 - new option: -progress
391 - 3GPP Timed Text encoder/decoder
392 - GeoTIFF decoder support
393 - ffmpeg -(no)stdin option
394 - Opus decoder using libopus
395 - caca output device using libcaca
396 - alphaextract and alphamerge filters
399 - Canopus Lossless Codec decoder
400 - bitmap subtitles in filters (experimental and temporary)
401 - MP2 encoding via TwoLAME
407 - SubRip encoder and decoder without embedded timing
408 - edge detection filter
410 - ffmpeg -shortest option is now per-output file
411 -pass and -passlogfile are now per-output stream
412 - volume measurement filter
414 - Microsoft Screen 2 decoder
415 - smartblur filter ported from MPlayer
417 - decimate filter ported from MPlayer
418 - RTP depacketization of JPEG
419 - Smooth Streaming live segmenter muxer
421 - sendcmd and asendcmd filters
422 - WebVTT demuxer and decoder (simple tags supported)
423 - RTP packetization of JPEG
424 - faststart option in the MOV/MP4 muxer
425 - support for building with MSVC
430 - Fixes: CVE-2012-2772, CVE-2012-2774, CVE-2012-2775, CVE-2012-2776, CVE-2012-2777,
431 CVE-2012-2779, CVE-2012-2782, CVE-2012-2783, CVE-2012-2784, CVE-2012-2785,
432 CVE-2012-2786, CVE-2012-2787, CVE-2012-2788, CVE-2012-2789, CVE-2012-2790,
433 CVE-2012-2791, CVE-2012-2792, CVE-2012-2793, CVE-2012-2794, CVE-2012-2795,
434 CVE-2012-2796, CVE-2012-2797, CVE-2012-2798, CVE-2012-2799, CVE-2012-2800,
435 CVE-2012-2801, CVE-2012-2802, CVE-2012-2803, CVE-2012-2804,
436 - v408 Quicktime and Microsoft AYUV Uncompressed 4:4:4:4 encoder and decoder
438 - CDXL demuxer and decoder
439 - Apple ProRes encoder
440 - ffprobe -count_packets and -count_frames options
441 - Sun Rasterfile Encoder
442 - ID3v2 attached pictures reading and writing
443 - WMA Lossless decoder
446 - libutvideo encoder wrapper (--enable-libutvideo)
449 - XBM encoder and decoder
450 - RealAudio Lossless decoder
453 - Metal Gear Solid: The Twin Snakes demuxer
454 - OpenEXR image decoder
456 - drop support for ffmpeg without libavfilter
457 - drawtext video filter: fontconfig support
458 - ffmpeg -benchmark_all option
459 - super2xsai filter ported from libmpcodecs
460 - add libavresample audio conversion library for compatibility
462 - Avid Meridien (AVUI) encoder and decoder
463 - accept + prefix to -pix_fmt option to disable automatic conversions.
464 - complete audio filtering in libavfilter and ffmpeg
469 - ffv1: support (draft) version 1.3
474 - Fixes: CVE-2011-3929, CVE-2011-3934, CVE-2011-3935, CVE-2011-3936,
475 CVE-2011-3937, CVE-2011-3940, CVE-2011-3941, CVE-2011-3944,
476 CVE-2011-3945, CVE-2011-3946, CVE-2011-3947, CVE-2011-3949,
477 CVE-2011-3950, CVE-2011-3951, CVE-2011-3952
478 - v410 Quicktime Uncompressed 4:4:4 10-bit encoder and decoder
479 - SBaGen (SBG) binaural beats script demuxer
481 - Timecode extraction in DV and MOV
482 - thumbnail video filter
483 - XML output in ffprobe
484 - asplit audio filter
485 - tinterlace video filter
486 - astreamsync audio filter
487 - amerge audio filter
488 - ISMV (Smooth Streaming) muxer
491 - XWD encoder and decoder
492 - Automatic thread count based on detection number of (available) CPU cores
493 - y41p Brooktree Uncompressed 4:1:1 12-bit encoder and decoder
494 - ffprobe -show_error option
495 - Avid 1:1 10-bit RGB Packer codec
496 - v308 Quicktime Uncompressed 4:4:4 encoder and decoder
497 - yuv4 libquicktime packed 4:2:0 encoder and decoder
498 - ffprobe -show_frames option
499 - silencedetect audio filter
500 - ffprobe -show_program_version, -show_library_versions, -show_versions options
501 - rv34: frame-level multi-threading
502 - optimized iMDCT transform on x86 using SSE for for mpegaudiodec
503 - Improved PGS subtitle decoder
504 - dumpgraph option to lavfi device
505 - r210 and r10k encoders
506 - ffwavesynth decoder
509 - support encoding and decoding 4-channel SGI images
514 - openal input device added
515 - boxblur filter added
517 - Flash Screen Video 2 decoder
518 - lavfi input device added
519 - added avconv, which is almost the same for now, except
520 for a few incompatible changes in the options, which will hopefully make them
521 easier to use. The changes are:
522 * The options placement is now strictly enforced! While in theory the
523 options for ffmpeg should be given in [input options] -i INPUT [output
524 options] OUTPUT order, in practice it was possible to give output options
525 before the -i and it mostly worked. Except when it didn't - the behavior was
526 a bit inconsistent. In avconv, it is not possible to mix input and output
527 options. All non-global options are reset after an input or output filename.
528 * All per-file options are now truly per-file - they apply only to the next
529 input or output file and specifying different values for different files
530 will now work properly (notably -ss and -t options).
531 * All per-stream options are now truly per-stream - it is possible to
532 specify which stream(s) should a given option apply to. See the Stream
533 specifiers section in the avconv manual for details.
534 * In ffmpeg some options (like -newvideo/-newaudio/...) are irregular in the
535 sense that they're specified after the output filename instead of before,
536 like all other options. In avconv this irregularity is removed, all options
537 apply to the next input or output file.
538 * -newvideo/-newaudio/-newsubtitle options were removed. Not only were they
539 irregular and highly confusing, they were also redundant. In avconv the -map
540 option will create new streams in the output file and map input streams to
541 them. E.g. avconv -i INPUT -map 0 OUTPUT will create an output stream for
542 each stream in the first input file.
543 * The -map option now has slightly different and more powerful syntax:
544 + Colons (':') are used to separate file index/stream type/stream index
545 instead of dots. Comma (',') is used to separate the sync stream instead
546 of colon.. This is done for consistency with other options.
547 + It's possible to specify stream type. E.g. -map 0:a:2 creates an
548 output stream from the third input audio stream.
549 + Omitting the stream index now maps all the streams of the given type,
550 not just the first. E.g. -map 0:s creates output streams for all the
551 subtitle streams in the first input file.
552 + Since -map can now match multiple streams, negative mappings were
553 introduced. Negative mappings disable some streams from an already
554 defined map. E.g. '-map 0 -map -0:a:1' means 'create output streams for
555 all the stream in the first input file, except for the second audio
557 * There is a new option -c (or -codec) for choosing the decoder/encoder to
558 use, which allows to precisely specify target stream(s) consistently with
559 other options. E.g. -c:v lib264 sets the codec for all video streams, -c:a:0
560 libvorbis sets the codec for the first audio stream and -c copy copies all
561 the streams without reencoding. Old -vcodec/-acodec/-scodec options are now
563 * It is now possible to precisely specify which stream should an AVOption
564 apply to. E.g. -b:v:0 2M sets the bitrate for the first video stream, while
565 -b:a 128k sets the bitrate for all audio streams. Note that the old -ab 128k
566 syntax is deprecated and will stop working soon.
567 * -map_chapters now takes only an input file index and applies to the next
568 output file. This is consistent with how all the other options work.
569 * -map_metadata now takes only an input metadata specifier and applies to
570 the next output file. Output metadata specifier is now part of the option
571 name, similarly to the AVOptions/map/codec feature above.
572 * -metadata can now be used to set metadata on streams and chapters, e.g.
573 -metadata:s:1 language=eng sets the language of the first stream to 'eng'.
574 This made -vlang/-alang/-slang options redundant, so they were removed.
575 * -qscale option now uses stream specifiers and applies to all streams, not
576 just video. I.e. plain -qscale number would now apply to all streams. To get
577 the old behavior, use -qscale:v. Also there is now a shortcut -q for -qscale
578 and -aq is now an alias for -q:a.
579 * -vbsf/-absf/-sbsf options were removed and replaced by a -bsf option which
580 uses stream specifiers. Use -bsf:v/a/s instead of the old options.
581 * -itsscale option now uses stream specifiers, so its argument is only the
583 * -intra option was removed, use -g 0 for the same effect.
584 * -psnr option was removed, use -flags +psnr for the same effect.
585 * -vf option is now an alias to the new -filter option, which uses stream specifiers.
586 * -vframes/-aframes/-dframes options are now aliases to the new -frames option.
587 * -vtag/-atag/-stag options are now aliases to the new -tag option.
590 - ashowinfo filter added
591 - Windows Media Image decoder
592 - amovie source added
594 - Speex encoder via libspeex
595 - JSON output in ffprobe
597 - Optional C++ Support (needed for libstagefright)
598 - H.264 Decoding on Android via Stagefright
600 - BIN/XBIN/ADF/IDF text file decoder
601 - aconvert audio filter added
602 - audio support to lavfi input device added
603 - libcdio-paranoia input device for audio CD grabbing
604 - Apple ProRes decoder
605 - CELT in Ogg demuxing
606 - G.723.1 demuxer and decoder
607 - libmodplug support (--enable-libmodplug)
608 - VC-1 interlaced decoding
609 - libutvideo wrapper (--enable-libutvideo)
610 - aevalsrc audio source added
612 - Speex encoding via libspeex
613 - 4:2:2 H.264 decoding support
614 - 4:2:2 and 4:4:4 H.264 encoding with libx264
615 - Pulseaudio input device
617 - Video Decoder Acceleration (VDA) HWAccel module.
618 - replacement Indeo 3 decoder
619 - new ffmpeg option: -map_channel
620 - volume audio filter added
621 - earwax audio filter added
622 - libv4l2 support (--enable-libv4l2)
623 - TLS/SSL and HTTPS protocol support
624 - AVOptions API rewritten and documented
625 - most of CODEC_FLAG2_*, some CODEC_FLAG_* and many codec-specific fields in
626 AVCodecContext deprecated. Codec private options should be used instead.
627 - Properly working defaults in libx264 wrapper, support for native presets.
628 - Encrypted OMA files support
629 - Discworld II BMV decoding support
631 - OS X Video Decoder Acceleration (VDA) support
632 - compact and csv output in ffprobe
634 - IFF Amiga Continuous Bitmap (ACBM) decoder
636 - CRI ADX audio format muxer and demuxer
637 - Playstation Portable PMP format demuxer
638 - Microsoft Windows ICO demuxer
640 - PCM format support in OMA demuxer
642 - new option: -report
643 - Dxtory capture format decoder
645 - Simple segmenting muxer
652 - many many things we forgot because we rather write code than changelogs
653 - WebM support in Matroska de/muxer
654 - low overhead Ogg muxing
656 - VP8 de/encoding via libvpx
657 - Demuxer for On2's IVF format
658 - Pictor/PC Paint decoder
660 - HE-AAC v2 encoding with libaacplus
661 - libfaad2 wrapper removed
662 - DTS-ES extension (XCh) decoding support
664 - RTSP tunneling over HTTP
665 - RTP depacketization of SVQ3
666 - -strict inofficial replaced by -strict unofficial
667 - ffplay -exitonkeydown and -exitonmousedown options added
668 - native GSM / GSM MS decoder
669 - RTP depacketization of QDM2
670 - ANSI/ASCII art playback system
671 - Lego Mindstorms RSO de/muxer
672 - libavcore added (and subsequently removed)
673 - SubRip subtitle file muxer and demuxer
674 - Chinese AVS encoding via libxavs
675 - ffprobe -show_packets option added
676 - RTP packetization of Theora and Vorbis
677 - RTP depacketization of MP4A-LATM
678 - RTP packetization and depacketization of VP8
680 - Apple HTTP Live Streaming demuxer
683 - G.722 ADPCM audio encoder/decoder
686 - frei0r wrapper filter
687 - change crop filter syntax to width:height:x:y
688 - make the crop filter accept parametric expressions
689 - make ffprobe accept AVFormatContext options
692 - Demuxer for Leitch/Harris' VR native stream format (LXF)
693 - RTP depacketization of the X-QT QuickTime format
694 - SAP (Session Announcement Protocol, RFC 2974) muxer and demuxer
696 - ffmpeg -crop* options removed
697 - transpose filter added
698 - ffmpeg -force_key_frames option added
699 - demuxer for receiving raw rtp:// URLs without an SDP description
700 - single stream LATM/LOAS decoder
701 - setpts filter added
702 - Win64 support for optimized x86 assembly functions
703 - MJPEG/AVI1 to JPEG/JFIF bitstream filter
704 - ASS subtitle encoder and decoder
705 - IEC 61937 encapsulation for E-AC-3, TrueHD, DTS-HD (for HDMI passthrough)
706 - overlay filter added
707 - rename aspect filter to setdar, and pixelaspect to setsar
709 - Mobotix .mxg demuxer
710 - frei0r source added
711 - hqdn3d filter added
712 - RTP depacketization of QCELP
714 - gradfun filter added
716 - replace the ocv_smooth filter with a more generic ocv filter
717 - Windows Televison (WTV) demuxer
718 - FFmpeg metadata format muxer and demuxer
719 - SubRip (srt) subtitle encoder and decoder
720 - floating-point AC-3 encoder added
722 - ffmpeg -copytb option added
724 - Wing Commander IV movies decoder added
726 - Bink version 'b' audio and video decoder
727 - Bitmap Brothers JV playback system
728 - Apple HTTP Live Streaming protocol handler
729 - sndio support for playback and record
730 - Linux framebuffer input device added
731 - Chronomaster DFA decoder
733 - MicroDVD subtitle file muxer and demuxer
734 - Playstation Portable PMP format demuxer
735 - fieldorder video filter added
736 - AAC encoding via libvo-aacenc
737 - AMR-WB encoding via libvo-amrwbenc
739 - Mobotix MxPEG decoder
740 - VP8 frame-multithreading
741 - NEON optimizations for VP8
742 - Lots of deprecated API cruft removed
743 - fft and imdct optimizations for AVX (Sandy Bridge) processors
744 - showinfo filter added
745 - SMPTE 302M AES3 audio decoder
746 - Apple Core Audio Format muxer
747 - 9bit and 10bit per sample support in the H.264 decoder
748 - 9bit and 10bit FFV1 encoding / decoding
750 - select filter added
751 - sdl output device added
752 - libmpcodecs video filter support (3 times as many filters than before)
753 - mpeg2 aspect ratio dection fixed
754 - libxvid aspect pickiness fixed
755 - Frame multithreaded decoding
756 - E-AC-3 audio encoder
757 - ac3enc: add channel coupling support
758 - floating-point sample format support to the ac3, eac3, dca, aac, and vorbis decoders.
759 - H264/MPEG frame-level multi-threading
760 - All av_metadata_* functions renamed to av_dict_* and moved to libavutil
761 - 4:4:4 H.264 decoding support
762 - 10-bit H.264 optimizations for x86
763 - lut, lutrgb, and lutyuv filters added
764 - buffersink libavfilter sink added
765 - Bump libswscale for recently reported ABI break
766 - New J2K encoder (via OpenJPEG)
771 - all the changes for 0.8, but keeping API/ABI compatibility with the 0.6 release
776 - PB-frame decoding for H.263
777 - deprecated vhook subsystem removed
778 - deprecated old scaler removed
780 - Alpha channel scaler
782 - RTP packetization of H.263
783 - RTP packetization of AMR
784 - RTP depacketization of Vorbis
785 - CorePNG decoding support
786 - Cook multichannel decoding support
787 - introduced avlanguage helpers in libavformat
788 - 8088flex TMV demuxer and decoder
789 - per-stream language-tags extraction in asfdec
790 - V210 decoder and encoder
791 - remaining GPL parts in AC-3 decoder converted to LGPL
793 - SoX native format muxer and demuxer
794 - AMR-NB decoding/encoding, AMR-WB decoding via OpenCORE libraries
796 - Electronic Arts Madcow decoder
797 - DivX (XSUB) subtitle encoder
798 - nonfree libamr support for AMR-NB/WB decoding/encoding removed
799 - experimental AAC encoder
800 - RTP depacketization of ASF and RTSP from WMS servers
801 - RTMP support in libavformat
802 - noX handling for OPT_BOOL X options
804 - IEC-61937 compatible Muxer
806 - Bluray (PGS) subtitle decoder
807 - LPCM support in MPEG-TS (HDMV RID as found on Blu-ray disks)
809 - Core Audio Format demuxer
811 - MD STUDIO audio demuxer
812 - RF64 support in WAV demuxer
813 - MPEG-4 Audio Lossless Coding (ALS) decoder
814 - -formats option split into -formats, -codecs, -bsfs, and -protocols
816 - CDG demuxer and decoder
818 - Auravision Aura 1 and 2 decoders
819 - Deluxe Paint Animation playback system
821 - Adobe Filmstrip muxer and demuxer
822 - RTP depacketization of H.263
823 - Bink demuxer and audio/video decoders
824 - enable symbol versioning by default for linkers that support it
825 - IFF PBM/ILBM bitmap decoder
828 - RTP depacketization of AMR
834 - Kega Game Video (KGV1) decoder
835 - VorbisComment writing for FLAC, Ogg FLAC and Ogg Speex files
836 - RTP depacketization of Theora
837 - HTTP Digest authentication
838 - RTMP/RTMPT/RTMPS/RTMPE/RTMPTE protocol support via librtmp
839 - Psygnosis YOP demuxer and video decoder
840 - spectral extension support in the E-AC-3 decoder
841 - unsharp video filter
842 - RTP hinting in the mov/3gp/mp4 muxer
843 - Dirac in Ogg demuxing
844 - seek to keyframes in Ogg
845 - 4:2:2 and 4:4:4 Theora decoding
846 - 35% faster VP3/Theora decoding
847 - faster AAC decoding
848 - faster H.264 decoding
849 - RealAudio 1.0 (14.4K) encoder
854 - DV50 AKA DVCPRO50 encoder, decoder, muxer and demuxer
855 - TechSmith Camtasia (TSCC) video decoder
856 - IBM Ultimotion (ULTI) video decoder
857 - Sierra Online audio file demuxer and decoder
858 - Apple QuickDraw (qdrw) video decoder
859 - Creative ADPCM audio decoder (16 bits as well as 8 bits schemes)
860 - Electronic Arts Multimedia (WVE/UV2/etc.) file demuxer
861 - Miro VideoXL (VIXL) video decoder
862 - H.261 video encoder
864 - Nullsoft Video (NSV) file demuxer
865 - Shorten audio decoder
867 - Apple Lossless Audio Codec (ALAC) decoder
868 - Winnov WNV1 video decoder
869 - Autodesk Animator Studio Codec (AASC) decoder
870 - Indeo 2 video decoder
871 - Fraps FPS1 video decoder
872 - Snow video encoder/decoder
873 - Sonic audio encoder/decoder
874 - Vorbis audio decoder
875 - Macromedia ADPCM decoder
876 - Duck TrueMotion 2 video decoder
877 - support for decoding FLX and DTA extensions in FLIC files
878 - H.264 custom quantization matrices support
879 - ffserver fixed, it should now be usable again
881 - Real Cooker audio decoder
882 - TrueSpeech audio decoder
883 - WMA2 audio decoder fixed, now all files should play correctly
884 - RealAudio 14.4 and 28.8 decoders fixed
886 - build system improvements
887 - tabs and trailing whitespace removed from the codebase
888 - CamStudio video decoder
889 - AIFF/AIFF-C audio format, encoding and decoding
890 - ADTS AAC file reading and writing
891 - Creative VOC file reading and writing
892 - American Laser Games multimedia (*.mm) playback system
893 - Zip Motion Blocks Video decoder
894 - improved Theora/VP3 decoder
895 - True Audio (TTA) decoder
896 - AVS demuxer and video decoder
898 - Smacker demuxer and decoder
899 - NuppelVideo/MythTV demuxer and RTjpeg decoder
901 - MPEG-2 intra VLC support
902 - MPEG-2 4:2:2 encoder
903 - Flash Screen Video decoder
905 - Chinese AVS decoder
908 - VC-1/WMV3/WMV9 video decoder
911 - VMware video decoder
914 - WavPack lossless audio decoder
915 - Targa (.TGA) picture decoder
916 - Vorbis audio encoder
917 - Delphine Software .cin demuxer/audio and video decoder
918 - Tiertex .seq demuxer/video decoder
920 - TIFF picture encoder and decoder
921 - GIF picture decoder
922 - Intel Music Coder decoder
923 - Zip Motion Blocks Video encoder
925 - Flash Screen Video encoder
926 - Theora encoding via libtheora
929 - GSM-MS encoder and decoder
931 - DXA demuxer and decoder
933 - Gamecube movie (.THP) playback system
934 - Blackfin optimizations
935 - Interplay C93 demuxer and video decoder
936 - Bethsoft VID demuxer and video decoder
939 - V.Flash PTX decoder
940 - RoQ muxer, RoQ audio encoder
941 - Renderware TXD demuxer and decoder
942 - extern C declarations for C++ removed from headers
943 - sws_flags command line option
947 - OS/2 support removed and restored again
950 - additional SPARC (VIS) optimizations
952 - slice-based parallel H.264 decoding
953 - Monkey's Audio demuxer and decoder
954 - AMV audio and video decoder
956 - H.264 PAFF decoding
957 - Nellymoser ASAO decoder
958 - Beam Software SIFF demuxer and decoder
959 - libvorbis Vorbis decoding removed in favor of native decoder
960 - IntraX8 (J-Frame) subdecoder for WMV2 and VC-1
961 - Ogg (Theora, Vorbis and FLAC) muxer
962 - The "device" muxers and demuxers are now in a new libavdevice library
963 - PC Paintbrush PCX decoder
964 - Sun Rasterfile decoder
965 - TechnoTrend PVA demuxer
966 - Linux Media Labs MPEG-4 (LMLM4) demuxer
967 - AVM2 (Flash 9) SWF muxer
968 - QT variant of IMA ADPCM encoder
970 - iPod/iPhone compatible mp4 muxer
972 - MSN TCP Webcam stream demuxer
973 - RL2 demuxer / decoder
976 - non-recursive Makefiles
978 - MAXIS EA XA (.xa) demuxer / decoder
982 - Electronic Arts CMV decoder
983 - Motion Pixels Video decoder
984 - Motion Pixels MVI demuxer
985 - removed animated GIF decoder/demuxer
986 - D-Cinema audio muxer
987 - Electronic Arts TGV decoder
988 - Apple Lossless Audio Codec (ALAC) encoder
990 - floating point PCM encoder/decoder
992 - DV100 AKA DVCPRO HD decoder and demuxer
993 - E-AC-3 support added to AC-3 decoder
994 - Nellymoser ASAO encoder
995 - ASS and SSA demuxer and muxer
996 - liba52 wrapper removed
997 - SVQ3 watermark decoding support
998 - Speex decoding via libspeex
999 - Electronic Arts TGQ decoder
1001 - QCELP / PureVoice decoder
1003 - hybrid WavPack support
1004 - R3D REDCODE demuxer
1005 - ALSA support for playback and record
1006 - Electronic Arts TQI decoder
1007 - OpenJPEG based JPEG 2000 decoder
1008 - NC (NC4600) camera file demuxer
1009 - Gopher client support
1011 - generic metadata API
1012 - flash ScreenVideo2 encoder
1017 - DV encoder, DV muxer
1018 - Microsoft RLE video decoder
1019 - Microsoft Video-1 decoder
1020 - Apple Animation (RLE) decoder
1021 - Apple Graphics (SMC) decoder
1022 - Apple Video (RPZA) decoder
1024 - Sega FILM (CPK) file demuxer
1025 - Westwood multimedia support (VQA & AUD files)
1026 - Id Quake II CIN playback support
1027 - 8BPS video decoder
1028 - FLIC playback support
1029 - RealVideo 2.0 (RV20) decoder
1030 - Duck TrueMotion v1 (DUCK) video decoder
1031 - Sierra VMD demuxer and video decoder
1032 - MSZH and ZLIB decoder support
1033 - SVQ1 video encoder
1036 - rate distortion optimal cbp support
1037 - rate distorted optimal ac prediction for MPEG-4
1038 - rate distorted optimal lambda->qp support
1039 - AAC encoding with libfaac
1040 - Sunplus JPEG codec (SP5X) support
1041 - use Lagrange multipler instead of QP for ratecontrol
1042 - Theora/VP3 decoding support
1043 - XA and ADX ADPCM codecs
1044 - export MPEG-2 active display area / pan scan
1045 - Add support for configuring with IBM XLC
1046 - floating point AAN DCT
1047 - initial support for zygo video (not complete)
1049 - new audio/video parser API
1051 - av_read_frame() and av_seek_frame() support
1052 - missing last frame fixes
1053 - seek by mouse in ffplay
1054 - noise reduction of DCT coefficients
1055 - H.263 OBMC & 4MV support
1056 - H.263 alternative inter vlc support
1058 - H.263 slice structured mode
1059 - interlaced DCT support for MPEG-2 encoding
1060 - stuffing to stay above min_bitrate
1061 - MB type & QP visualization
1062 - frame stepping for ffplay
1063 - interlaced motion estimation
1064 - alternate scantable support
1065 - SVCD scan offset support
1066 - closed GOP support
1068 - quantizer noise shaping
1069 - G.726 ADPCM audio codec
1071 - multithreaded/SMP motion estimation
1072 - multithreaded/SMP encoding for MPEG-1/MPEG-2/MPEG-4/H.263
1073 - multithreaded/SMP decoding for MPEG-2
1075 - Metrowerks CodeWarrior suppport
1076 - H.263+ custom pcf support
1077 - nicer output for 'ffmpeg -formats'
1079 - SGI image format, encoding and decoding
1080 - H.264 loop filter support
1081 - H.264 CABAC support
1082 - nicer looking arrows for the motion vector visualization
1083 - improved VCD support
1084 - audio timestamp drift compensation
1085 - MPEG-2 YUV 422/444 support
1086 - polyphase kaiser windowed sinc and blackman nuttall windowed sinc audio resample
1087 - better image scaling
1089 - correctly interleave packets during encoding
1090 - VIS optimized motion compensation
1091 - intra_dc_precision>0 encoding support
1092 - support reuse of motion vectors/MB types/field select values of the source video
1093 - more accurate deblock filter
1095 - many optimizations and bugfixes
1096 - FunCom ISS audio file demuxer and according ADPCM decoding
1101 - MPEG-2 video encoding (Michael)
1102 - Id RoQ playback subsystem (Mike Melanson and Tim Ferguson)
1103 - Wing Commander III Movie (.mve) file playback subsystem (Mike Melanson
1105 - Xan DPCM audio decoder (Mario Brito)
1106 - Interplay MVE playback subsystem (Mike Melanson)
1107 - Duck DK3 and DK4 ADPCM audio decoders (Mike Melanson)
1112 - RealAudio 1.0 (14_4) and 2.0 (28_8) native decoders. Author unknown, code from mplayerhq
1113 (originally from public domain player for Amiga at http://www.honeypot.net/audio)
1114 - current version now also compiles with older GCC (Fabrice)
1115 - 4X multimedia playback system including 4xm file demuxer (Mike
1116 Melanson), and 4X video and audio codecs (Michael)
1117 - Creative YUV (CYUV) decoder (Mike Melanson)
1118 - FFV1 codec (our very simple lossless intra only codec, compresses much better
1119 than HuffYUV) (Michael)
1120 - ASV1 (Asus), H.264, Intel indeo3 codecs have been added (various)
1121 - tiny PNG encoder and decoder, tiny GIF decoder, PAM decoder (PPM with
1122 alpha support), JPEG YUV colorspace support. (Fabrice Bellard)
1123 - ffplay has been replaced with a newer version which uses SDL (optionally)
1124 for multiplatform support (Fabrice)
1125 - Sorenson Version 3 codec (SVQ3) support has been added (decoding only) - donated
1127 - AMR format has been added (Johannes Carlsson)
1128 - 3GP support has been added (Johannes Carlsson)
1129 - VP3 codec has been added (Mike Melanson)
1130 - more MPEG-1/2 fixes
1131 - better multiplatform support, MS Visual Studio fixes (various)
1132 - AltiVec optimizations (Magnus Damn and others)
1133 - SH4 processor support has been added (BERO)
1134 - new public interfaces (avcodec_get_pix_fmt) (Roman Shaposhnick)
1135 - VOB streaming support (Brian Foley)
1136 - better MP3 autodetection (Andriy Rysin)
1137 - qpel encoding (Michael)
1138 - 4mv+b frames encoding finally fixed (Michael)
1139 - chroma ME (Michael)
1140 - 5 comparison functions for ME (Michael)
1141 - B-frame encoding speedup (Michael)
1142 - WMV2 codec (unfinished - Michael)
1143 - user specified diamond size for EPZS (Michael)
1144 - Playstation STR playback subsystem, still experimental (Mike and Michael)
1145 - ASV2 codec (Michael)
1146 - CLJR decoder (Alex)
1148 .. And lots more new enhancements and fixes.
1153 - completely new integer only MPEG audio layer 1/2/3 decoder rewritten
1155 - Recoded DCT and motion vector search with gcc (no longer depends on nasm)
1156 - fix quantization bug in AC3 encoder
1157 - added PCM codecs and format. Corrected WAV/AVI/ASF PCM issues
1158 - added prototype ffplay program
1159 - added GOB header parsing on H.263/H.263+ decoder (Juanjo)
1160 - bug fix on MCBPC tables of H.263 (Juanjo)
1161 - bug fix on DC coefficients of H.263 (Juanjo)
1162 - added Advanced Prediction Mode on H.263/H.263+ decoder (Juanjo)
1163 - now we can decode H.263 streams found in QuickTime files (Juanjo)
1164 - now we can decode H.263 streams found in VIVO v1 files(Juanjo)
1165 - preliminary RTP "friendly" mode for H.263/H.263+ coding. (Juanjo)
1166 - added GOB header for H.263/H.263+ coding on RTP mode (Juanjo)
1167 - now H.263 picture size is returned on the first decoded frame (Juanjo)
1168 - added first regression tests
1169 - added MPEG-2 TS demuxer
1170 - new demux API for libav
1171 - more accurate and faster IDCT (Michael)
1172 - faster and entropy-controlled motion search (Michael)
1173 - two pass video encoding (Michael)
1174 - new video rate control (Michael)
1175 - added MSMPEG4V1, MSMPEGV2 and WMV1 support (Michael)
1176 - great performance improvement of video encoders and decoders (Michael)
1177 - new and faster bit readers and vlc parsers (Michael)
1178 - high quality encoding mode: tries all macroblock/VLC types (Michael)
1179 - added DV video decoder
1180 - preliminary RTP/RTSP support in ffserver and libavformat
1181 - H.263+ AIC decoding/encoding support (Juanjo)
1182 - VCD MPEG-PS mode (Juanjo)
1183 - PSNR stuff (Juanjo)
1184 - simple stats output (Juanjo)
1185 - 16-bit and 15-bit RGB/BGR/GBR support (Bisqwit)
1190 - some header fixes (Zdenek Kabelac <kabi at informatics.muni.cz>)
1191 - many MMX optimizations (Nick Kurshev <nickols_k at mail.ru>)
1192 - added configure system (actually a small shell script)
1193 - added MPEG audio layer 1/2/3 decoding using LGPL'ed mpglib by
1194 Michael Hipp (temporary solution - waiting for integer only
1196 - fixed VIDIOCSYNC interrupt
1197 - added Intel H.263 decoding support ('I263' AVI fourCC)
1198 - added Real Video 1.0 decoding (needs further testing)
1199 - simplified image formats again. Added PGM format (=grey
1200 pgm). Renamed old PGM to PGMYUV.
1201 - fixed msmpeg4 slice issues (tell me if you still find problems)
1202 - fixed OpenDivX bugs with newer versions (added VOL header decoding)
1203 - added support for MPlayer interface
1204 - added macroblock skip optimization
1205 - added MJPEG decoder
1206 - added mmx/mmxext IDCT from libmpeg2
1207 - added pgmyuvpipe, ppm, and ppm_pipe formats (original patch by Celer
1208 <celer at shell.scrypt.net>)
1209 - added pixel format conversion layer (e.g. for MJPEG or PPM)
1210 - added deinterlacing option
1212 - MPEG-4 vol header fixes (Jonathan Marsden <snmjbm at pacbell.net>)
1213 - ARM optimizations (Lionel Ulmer <lionel.ulmer at free.fr>).
1214 - Windows porting of file converter
1215 - added MJPEG raw format (input/output)
1216 - added JPEG image format support (input/output)
1221 - fixed some std header definitions (Bjorn Lindgren
1222 <bjorn.e.lindgren at telia.com>).
1223 - added MPEG demuxer (MPEG-1 and 2 compatible).
1225 - added prototype RM demuxer
1226 - added AC3 decoding (done with libac3 by Aaron Holtzman)
1227 - added decoding codec parameter guessing (.e.g. for MPEG, because the
1228 header does not include them)
1229 - fixed header generation in MPEG-1, AVI and ASF muxer: wmplayer can now
1230 play them (only tested video)
1231 - fixed H.263 white bug
1232 - fixed phase rounding in img resample filter
1233 - add MMX code for polyphase img resample filter
1234 - added CPU autodetection
1235 - added generic title/author/copyright/comment string handling (ASF and RM
1237 - added SWF demux to extract MP3 track (not usable yet because no MP3
1239 - added fractional frame rate support
1240 - codecs are no longer searched by read_header() (should fix ffserver
1246 - BGR24 patch (initial patch by Jeroen Vreeken <pe1rxq at amsat.org>)
1247 - fixed raw yuv output
1248 - added motion rounding support in MPEG-4
1249 - fixed motion bug rounding in MSMPEG4
1250 - added B-frame handling in video core
1251 - added full MPEG-1 decoding support
1252 - added partial (frame only) MPEG-2 support
1253 - changed the FOURCC code for H.263 to "U263" to be able to see the
1254 +AVI/H.263 file with the UB Video H.263+ decoder. MPlayer works with
1255 this +codec ;) (JuanJo).
1256 - Halfpel motion estimation after MB type selection (JuanJo)
1257 - added pgm and .Y.U.V output format
1258 - suppressed 'img:' protocol. Simply use: /tmp/test%d.[pgm|Y] as input or
1260 - added pgmpipe I/O format (original patch from Martin Aumueller
1261 <lists at reserv.at>, but changed completely since we use a format
1262 instead of a protocol)
1267 - added H.263/MPEG-4/MSMPEG4 decoding support. MPEG-4 decoding support
1268 (for OpenDivX) is almost complete: 8x8 MVs and rounding are
1269 missing. MSMPEG4 support is complete.
1270 - added prototype MPEG-1 decoder. Only I- and P-frames handled yet (it
1271 can decode ffmpeg MPEGs :-)).
1272 - added libavcodec API documentation (see apiexample.c).
1273 - fixed image polyphase bug (the bottom of some images could be
1275 - added support for non clipped motion vectors (decoding only)
1276 and image sizes non-multiple of 16
1277 - added support for AC prediction (decoding only)
1278 - added file overwrite confirmation (can be disabled with -y)
1279 - added custom size picture to H.263 using H.263+ (Juanjo)
1284 - added MSMPEG4 (aka DivX) compatible encoder. Changed default codec
1285 of AVI and ASF to DIV3.
1286 - added -me option to set motion estimation method
1287 (default=log). suppressed redundant -hq option.
1288 - added options -acodec and -vcodec to force a given codec (useful for
1291 - improved dct_quantize speed
1292 - factorized some motion estimation code
1297 - removing grab code from ffserver and moved it to ffmpeg. Added
1298 multistream support to ffmpeg.
1299 - added timeshifting support for live feeds (option ?date=xxx in the
1301 - added high quality image resize code with polyphase filter (need
1302 mmx/see optimization). Enable multiple image size support in ffserver.
1303 - added multi live feed support in ffserver
1304 - suppressed master feature from ffserver (it should be done with an
1305 external program which opens the .ffm url and writes it to another
1307 - added preliminary support for video stream parsing (WAV and AVI half
1308 done). Added proper support for audio/video file conversion in
1310 - added preliminary support for video file sending from ffserver
1311 - redesigning I/O subsystem: now using URL based input and output
1313 - added WAV format support
1314 - added "tty user interface" to ffmpeg to stop grabbing gracefully
1315 - added MMX/SSE optimizations to SAD (Sums of Absolutes Differences)
1316 (Juan J. Sierralta P. a.k.a. "Juanjo" <juanjo at atmlab.utfsm.cl>)
1317 - added MMX DCT from mpeg2_movie 1.5 (Juanjo)
1318 - added new motion estimation algorithms, log and phods (Juanjo)
1319 - changed directories: libav for format handling, libavcodec for
1325 - added stereo in MPEG audio encoder
1330 - added 'high quality' mode which use motion vectors. It can be used in
1331 real time at low resolution.
1332 - fixed rounding problems which caused quality problems at high
1333 bitrates and large GOP size
1336 version 0.3.2: small fixes
1342 version 0.3.1: added avi/divx support
1345 - added MPEG-4 codec compatible with OpenDivX. It is based on the H.263 codec
1346 - added sound for flash format (not tested)
1349 version 0.3: initial public release