PeerStreamer

Entries are sorted chronologically from oldest to youngest within each release,

releases are sorted from youngest to oldest.

version <next>:

- WebM support in Matroska de/muxer

- low overhead Ogg muxing

- MMS-TCP support

- VP8 de/encoding via libvpx

- Demuxer for On2's IVF format

- Pictor/PC Paint decoder

- HE-AAC v2 decoder

- libfaad2 wrapper removed

- DTS-ES extension (XCh) decoding support

- native VP8 decoder

- RTSP tunneling over HTTP

- RTP depacketization of SVQ3

- -strict inofficial replaced by -strict unofficial

- ffplay -exitonkeydown and -exitonmousedown options added

- native GSM / GSM MS decoder

- RTP depacketization of QDM2

- ANSI/ASCII art playback system

- Lego Mindstorms RSO de/muxer

- libavcore added

- SubRip subtitle file muxer and demuxer

- Chinese AVS encoding via libxavs

- ffprobe -show_packets option added

- RTP packetization of Theora and Vorbis

- RTP depacketization of MP4A-LATM

- RTP packetization and depacketization of VP8

- hflip filter

- Apple HTTP Live Streaming demuxer

- a64 codec

- MMS-HTTP support

- G.722 ADPCM audio encoder/decoder

- R10k video decoder

- ocv_smooth filter

- frei0r wrapper filter

- change crop filter syntax to width:height:x:y

- make the crop filter accept parametric expressions

- make ffprobe accept AVFormatContext options

- yadif filter

- blackframe filter

- Demuxer for Leitch/Harris' VR native stream format (LXF)

- RTP depacketization of the X-QT QuickTime format

- SAP (Session Announcement Protocol, RFC 2974) muxer and demuxer

- cropdetect filter

- ffmpeg -crop* options removed

- transpose filter added

- ffmpeg -force_key_frames option added

- demuxer for receiving raw rtp:// URLs without an SDP description

- single stream LATM/LOAS decoder

- setpts filter added

- Win64 support for optimized asm functions

- MJPEG/AVI1 to JPEG/JFIF bitstream filter

- ASS subtitle encoder and decoder

- IEC 61937 encapsulation for E-AC3, TrueHD, DTS-HD (for HDMI passthrough)

- overlay filter added

- rename aspect filter to setdar, and pixelaspect to setsar

- IEC 61937 demuxer

- Mobotix .mxg demuxer

- frei0r source added

- hqdn3d filter added

- RTP depacketization of QCELP

- FLAC parser added

- gradfun filter added

- AMR-WB decoder

- replace the ocv_smooth filter with a more generic ocv filter

- Windows Televison (WTV) demuxer

- FFmpeg metadata format muxer and demuxer

- SubRip (srt) subtitle decoder

- floating-point AC-3 encoder added

- Lagarith decoder

- ffmpeg -copytb option added

- IVF muxer added

- Wing Commander IV movies decoder added

- movie source added

- Bink version 'b' audio and video decoder

- Bitmap Brothers JV playback system

- Apple HTTP Live Streaming protocol handler

- sndio support for playback and record

- Linux framebuffer input device added

- Chronomaster DFA decoder

- Mobotix MxPEG decoder

version 0.6:

- PB-frame decoding for H.263

- deprecated vhook subsystem removed

- deprecated old scaler removed

- VQF demuxer

- Alpha channel scaler

- PCX encoder

- RTP packetization of H.263

- RTP packetization of AMR

- RTP depacketization of Vorbis

- CorePNG decoding support

- Cook multichannel decoding support

- introduced avlanguage helpers in libavformat

- 8088flex TMV demuxer and decoder

- per-stream language-tags extraction in asfdec

- V210 decoder and encoder

- remaining GPL parts in AC-3 decoder converted to LGPL

- QCP demuxer

- SoX native format muxer and demuxer

- AMR-NB decoding/encoding, AMR-WB decoding via OpenCORE libraries

- DPX image decoder

- Electronic Arts Madcow decoder

- DivX (XSUB) subtitle encoder

- nonfree libamr support for AMR-NB/WB decoding/encoding removed

- experimental AAC encoder

- RTP depacketization of ASF and RTSP from WMS servers

- RTMP support in libavformat

- noX handling for OPT_BOOL X options

- Wave64 demuxer

- IEC-61937 compatible Muxer

- TwinVQ decoder

- Bluray (PGS) subtitle decoder

- LPCM support in MPEG-TS (HDMV RID as found on Blu-ray disks)

- WMA Pro decoder

- Core Audio Format demuxer

- Atrac1 decoder

- MD STUDIO audio demuxer

- RF64 support in WAV demuxer

- MPEG-4 Audio Lossless Coding (ALS) decoder

- -formats option split into -formats, -codecs, -bsfs, and -protocols

- IV8 demuxer

- CDG demuxer and decoder

- R210 decoder

- Auravision Aura 1 and 2 decoders

- Deluxe Paint Animation playback system

- SIPR decoder

- Adobe Filmstrip muxer and demuxer

- RTP depacketization of H.263

- Bink demuxer and audio/video decoders

- enable symbol versioning by default for linkers that support it

- IFF PBM/ILBM bitmap decoder

- concat protocol

- Indeo 5 decoder

- RTP depacketization of AMR

- WMA Voice decoder

- ffprobe tool

- AMR-NB decoder

- RTSP muxer

- HE-AAC v1 decoder

- Kega Game Video (KGV1) decoder

- VorbisComment writing for FLAC, Ogg FLAC and Ogg Speex files

- RTP depacketization of Theora

- HTTP Digest authentication

- RTMP/RTMPT/RTMPS/RTMPE/RTMPTE protocol support via librtmp

- Psygnosis YOP demuxer and video decoder

- spectral extension support in the E-AC-3 decoder

- unsharp video filter

- RTP hinting in the mov/3gp/mp4 muxer

- Dirac in Ogg demuxing

- seek to keyframes in Ogg

- 4:2:2 and 4:4:4 Theora decoding

- 35% faster VP3/Theora decoding

- faster AAC decoding

- faster H.264 decoding

- RealAudio 1.0 (14.4K) encoder

version 0.5:

- DV50 AKA DVCPRO50 encoder, decoder, muxer and demuxer

- TechSmith Camtasia (TSCC) video decoder

- IBM Ultimotion (ULTI) video decoder

- Sierra Online audio file demuxer and decoder

- Apple QuickDraw (qdrw) video decoder

- Creative ADPCM audio decoder (16 bits as well as 8 bits schemes)

- Electronic Arts Multimedia (WVE/UV2/etc.) file demuxer

- Miro VideoXL (VIXL) video decoder

- H.261 video encoder

- QPEG video decoder

- Nullsoft Video (NSV) file demuxer

- Shorten audio decoder

- LOCO video decoder

- Apple Lossless Audio Codec (ALAC) decoder

- Winnov WNV1 video decoder

- Autodesk Animator Studio Codec (AASC) decoder

- Indeo 2 video decoder

- Fraps FPS1 video decoder

- Snow video encoder/decoder

- Sonic audio encoder/decoder

- Vorbis audio decoder

- Macromedia ADPCM decoder

- Duck TrueMotion 2 video decoder

- support for decoding FLX and DTA extensions in FLIC files

- H.264 custom quantization matrices support

- ffserver fixed, it should now be usable again

- QDM2 audio decoder

- Real Cooker audio decoder

- TrueSpeech audio decoder

- WMA2 audio decoder fixed, now all files should play correctly

- RealAudio 14.4 and 28.8 decoders fixed

- JPEG-LS decoder

- build system improvements

- tabs and trailing whitespace removed from the codebase

- CamStudio video decoder

- AIFF/AIFF-C audio format, encoding and decoding

- ADTS AAC file reading and writing

- Creative VOC file reading and writing

- American Laser Games multimedia (*.mm) playback system

- Zip Motion Blocks Video decoder

- improved Theora/VP3 decoder

- True Audio (TTA) decoder

- AVS demuxer and video decoder

- JPEG-LS encoder

- Smacker demuxer and decoder

- NuppelVideo/MythTV demuxer and RTjpeg decoder

- KMVC decoder

- MPEG-2 intra VLC support

- MPEG-2 4:2:2 encoder

- Flash Screen Video decoder

- GXF demuxer

- Chinese AVS decoder

- GXF muxer

- MXF demuxer

- VC-1/WMV3/WMV9 video decoder

- MacIntel support

- AVISynth support

- VMware video decoder

- VP5 video decoder

- VP6 video decoder

- WavPack lossless audio decoder

- Targa (.TGA) picture decoder

- Vorbis audio encoder

- Delphine Software .cin demuxer/audio and video decoder

- Tiertex .seq demuxer/video decoder

- MTV demuxer

- TIFF picture encoder and decoder

- GIF picture decoder

- Intel Music Coder decoder

- Zip Motion Blocks Video encoder

- Musepack decoder

- Flash Screen Video encoder

- Theora encoding via libtheora

- BMP encoder

- WMA encoder

- GSM-MS encoder and decoder

- DCA decoder

- DXA demuxer and decoder

- DNxHD decoder

- Gamecube movie (.THP) playback system

- Blackfin optimizations

- Interplay C93 demuxer and video decoder

- Bethsoft VID demuxer and video decoder

- CRYO APC demuxer

- Atrac3 decoder

- V.Flash PTX decoder

- RoQ muxer, RoQ audio encoder

- Renderware TXD demuxer and decoder

- extern C declarations for C++ removed from headers

- sws_flags command line option

- codebook generator

- RoQ video encoder

- QTRLE encoder

- OS/2 support removed and restored again

- AC-3 decoder

- NUT muxer

- additional SPARC (VIS) optimizations

- Matroska muxer

- slice-based parallel H.264 decoding

- Monkey's Audio demuxer and decoder

- AMV audio and video decoder

- DNxHD encoder

- H.264 PAFF decoding

- Nellymoser ASAO decoder

- Beam Software SIFF demuxer and decoder

- libvorbis Vorbis decoding removed in favor of native decoder

- IntraX8 (J-Frame) subdecoder for WMV2 and VC-1

- Ogg (Theora, Vorbis and FLAC) muxer

- The "device" muxers and demuxers are now in a new libavdevice library

- PC Paintbrush PCX decoder

- Sun Rasterfile decoder

- TechnoTrend PVA demuxer

- Linux Media Labs MPEG-4 (LMLM4) demuxer

- AVM2 (Flash 9) SWF muxer

- QT variant of IMA ADPCM encoder

- VFW grabber

- iPod/iPhone compatible mp4 muxer

- Mimic decoder

- MSN TCP Webcam stream demuxer

- RL2 demuxer / decoder

- IFF demuxer

- 8SVX audio decoder

- non-recursive Makefiles

- BFI demuxer

- MAXIS EA XA (.xa) demuxer / decoder

- BFI video decoder

- OMA demuxer

- MLP/TrueHD decoder

- Electronic Arts CMV decoder

- Motion Pixels Video decoder

- Motion Pixels MVI demuxer

- removed animated GIF decoder/demuxer

- D-Cinema audio muxer

- Electronic Arts TGV decoder

- Apple Lossless Audio Codec (ALAC) encoder

- AAC decoder

- floating point PCM encoder/decoder

- MXF muxer

- DV100 AKA DVCPRO HD decoder and demuxer

- E-AC-3 support added to AC-3 decoder

- Nellymoser ASAO encoder

- ASS and SSA demuxer and muxer

- liba52 wrapper removed

- SVQ3 watermark decoding support

- Speex decoding via libspeex

- Electronic Arts TGQ decoder

- RV40 decoder

- QCELP / PureVoice decoder

- RV30 decoder

- hybrid WavPack support

- R3D REDCODE demuxer

- ALSA support for playback and record

- Electronic Arts TQI decoder

- OpenJPEG based JPEG 2000 decoder

- NC (NC4600) camera file demuxer

- Gopher client support

- MXF D-10 muxer

- generic metadata API

version 0.4.9-pre1:

- DV encoder, DV muxer

- Microsoft RLE video decoder

- Microsoft Video-1 decoder

- Apple Animation (RLE) decoder

- Apple Graphics (SMC) decoder

- Apple Video (RPZA) decoder

- Cinepak decoder

- Sega FILM (CPK) file demuxer

- Westwood multimedia support (VQA & AUD files)

- Id Quake II CIN playback support

- 8BPS video decoder

- FLIC playback support

- RealVideo 2.0 (RV20) decoder

- Duck TrueMotion v1 (DUCK) video decoder

- Sierra VMD demuxer and video decoder

- MSZH and ZLIB decoder support

- SVQ1 video encoder

- AMR-WB support

- PPC optimizations

- rate distortion optimal cbp support

- rate distorted optimal ac prediction for MPEG-4

- rate distorted optimal lambda->qp support

- AAC encoding with libfaac

- Sunplus JPEG codec (SP5X) support

- use Lagrange multipler instead of QP for ratecontrol

- Theora/VP3 decoding support

- XA and ADX ADPCM codecs

- export MPEG-2 active display area / pan scan

- Add support for configuring with IBM XLC

- floating point AAN DCT

- initial support for zygo video (not complete)

- RGB ffv1 support

- new audio/video parser API

- av_log() system

- av_read_frame() and av_seek_frame() support

- missing last frame fixes

- seek by mouse in ffplay

- noise reduction of DCT coefficients

- H.263 OBMC & 4MV support

- H.263 alternative inter vlc support

- H.263 loop filter

- H.263 slice structured mode

- interlaced DCT support for MPEG-2 encoding

- stuffing to stay above min_bitrate

- MB type & QP visualization

- frame stepping for ffplay

- interlaced motion estimation

- alternate scantable support

- SVCD scan offset support

- closed GOP support

- SSE2 FDCT

- quantizer noise shaping

- G.726 ADPCM audio codec

- MS ADPCM encoding

- multithreaded/SMP motion estimation

- multithreaded/SMP encoding for MPEG-1/MPEG-2/MPEG-4/H.263

- multithreaded/SMP decoding for MPEG-2

- FLAC decoder

- Metrowerks CodeWarrior suppport

- H.263+ custom pcf support

- nicer output for 'ffmpeg -formats'

- Matroska demuxer

- SGI image format, encoding and decoding

- H.264 loop filter support

- H.264 CABAC support

- nicer looking arrows for the motion vector visualization

- improved VCD support

- audio timestamp drift compensation

- MPEG-2 YUV 422/444 support

- polyphase kaiser windowed sinc and blackman nuttall windowed sinc audio resample

- better image scaling

- H.261 support

- correctly interleave packets during encoding

- VIS optimized motion compensation

- intra_dc_precision>0 encoding support

- support reuse of motion vectors/MB types/field select values of the source video

- more accurate deblock filter

- padding support

- many optimizations and bugfixes

- FunCom ISS audio file demuxer and according ADPCM decoding

version 0.4.8:

- MPEG-2 video encoding (Michael)

- Id RoQ playback subsystem (Mike Melanson and Tim Ferguson)

- Wing Commander III Movie (.mve) file playback subsystem (Mike Melanson

  and Mario Brito)

- Xan DPCM audio decoder (Mario Brito)

- Interplay MVE playback subsystem (Mike Melanson)

- Duck DK3 and DK4 ADPCM audio decoders (Mike Melanson)

version 0.4.7:

- RealAudio 1.0 (14_4) and 2.0 (28_8) native decoders. Author unknown, code from mplayerhq

  (originally from public domain player for Amiga at http://www.honeypot.net/audio)

- current version now also compiles with older GCC (Fabrice)

- 4X multimedia playback system including 4xm file demuxer (Mike

  Melanson), and 4X video and audio codecs (Michael)

- Creative YUV (CYUV) decoder (Mike Melanson)

- FFV1 codec (our very simple lossless intra only codec, compresses much better

  than HuffYUV) (Michael)

- ASV1 (Asus), H.264, Intel indeo3 codecs have been added (various)

- tiny PNG encoder and decoder, tiny GIF decoder, PAM decoder (PPM with

  alpha support), JPEG YUV colorspace support. (Fabrice Bellard)

- ffplay has been replaced with a newer version which uses SDL (optionally)

  for multiplatform support (Fabrice)

- Sorenson Version 3 codec (SVQ3) support has been added (decoding only) - donated

  by anonymous

- AMR format has been added (Johannes Carlsson)

- 3GP support has been added (Johannes Carlsson)

- VP3 codec has been added (Mike Melanson)

- more MPEG-1/2 fixes

- better multiplatform support, MS Visual Studio fixes (various)

- AltiVec optimizations (Magnus Damn and others)

- SH4 processor support has been added (BERO)

- new public interfaces (avcodec_get_pix_fmt) (Roman Shaposhnick)

- VOB streaming support (Brian Foley)

- better MP3 autodetection (Andriy Rysin)

- qpel encoding (Michael)

- 4mv+b frames encoding finally fixed (Michael)

- chroma ME (Michael)

- 5 comparison functions for ME (Michael)

- B-frame encoding speedup (Michael)

- WMV2 codec (unfinished - Michael)

- user specified diamond size for EPZS (Michael)

- Playstation STR playback subsystem, still experimental (Mike and Michael)

- ASV2 codec (Michael)

- CLJR decoder (Alex)

.. And lots more new enhancements and fixes.

version 0.4.6:

- completely new integer only MPEG audio layer 1/2/3 decoder rewritten

  from scratch

- Recoded DCT and motion vector search with gcc (no longer depends on nasm)

- fix quantization bug in AC3 encoder

- added PCM codecs and format. Corrected WAV/AVI/ASF PCM issues

- added prototype ffplay program

- added GOB header parsing on H.263/H.263+ decoder (Juanjo)

- bug fix on MCBPC tables of H.263 (Juanjo)

- bug fix on DC coefficients of H.263 (Juanjo)

- added Advanced Prediction Mode on H.263/H.263+ decoder (Juanjo)

- now we can decode H.263 streams found in QuickTime files (Juanjo)

- now we can decode H.263 streams found in VIVO v1 files(Juanjo)

- preliminary RTP "friendly" mode for H.263/H.263+ coding. (Juanjo)

- added GOB header for H.263/H.263+ coding on RTP mode (Juanjo)

- now H.263 picture size is returned on the first decoded frame (Juanjo)

- added first regression tests

- added MPEG-2 TS demuxer

- new demux API for libav

- more accurate and faster IDCT (Michael)

- faster and entropy-controlled motion search (Michael)

- two pass video encoding (Michael)

- new video rate control (Michael)

- added MSMPEG4V1, MSMPEGV2 and WMV1 support (Michael)

- great performance improvement of video encoders and decoders (Michael)

- new and faster bit readers and vlc parsers (Michael)

- high quality encoding mode: tries all macroblock/VLC types (Michael)

- added DV video decoder

- preliminary RTP/RTSP support in ffserver and libavformat

- H.263+ AIC decoding/encoding support (Juanjo)

- VCD MPEG-PS mode (Juanjo)

- PSNR stuff (Juanjo)

- simple stats output (Juanjo)

- 16-bit and 15-bit RGB/BGR/GBR support (Bisqwit)

version 0.4.5:

- some header fixes (Zdenek Kabelac <kabi at informatics.muni.cz>)

- many MMX optimizations (Nick Kurshev <nickols_k at mail.ru>)

- added configure system (actually a small shell script)

- added MPEG audio layer 1/2/3 decoding using LGPL'ed mpglib by

  Michael Hipp (temporary solution - waiting for integer only

  decoder)

- fixed VIDIOCSYNC interrupt

- added Intel H.263 decoding support ('I263' AVI fourCC)

- added Real Video 1.0 decoding (needs further testing)

- simplified image formats again. Added PGM format (=grey

  pgm). Renamed old PGM to PGMYUV.

- fixed msmpeg4 slice issues (tell me if you still find problems)

- fixed OpenDivX bugs with newer versions (added VOL header decoding)

- added support for MPlayer interface

- added macroblock skip optimization

- added MJPEG decoder

- added mmx/mmxext IDCT from libmpeg2

- added pgmyuvpipe, ppm, and ppm_pipe formats (original patch by Celer

  <celer at shell.scrypt.net>)

- added pixel format conversion layer (e.g. for MJPEG or PPM)

- added deinterlacing option

- MPEG-1/2 fixes

- MPEG-4 vol header fixes (Jonathan Marsden <snmjbm at pacbell.net>)

- ARM optimizations (Lionel Ulmer <lionel.ulmer at free.fr>).

- Windows porting of file converter

- added MJPEG raw format (input/ouput)

- added JPEG image format support (input/output)

version 0.4.4:

- fixed some std header definitions (Bjorn Lindgren

  <bjorn.e.lindgren at telia.com>).

- added MPEG demuxer (MPEG-1 and 2 compatible).

- added ASF demuxer

- added prototype RM demuxer

- added AC3 decoding (done with libac3 by Aaron Holtzman)

- added decoding codec parameter guessing (.e.g. for MPEG, because the

  header does not include them)

- fixed header generation in MPEG-1, AVI and ASF muxer: wmplayer can now

  play them (only tested video)

- fixed H.263 white bug

- fixed phase rounding in img resample filter

- add MMX code for polyphase img resample filter

- added CPU autodetection

- added generic title/author/copyright/comment string handling (ASF and RM

  use them)

- added SWF demux to extract MP3 track (not usable yet because no MP3

  decoder)

- added fractional frame rate support

- codecs are no longer searched by read_header() (should fix ffserver

  segfault)

version 0.4.3:

- BGR24 patch (initial patch by Jeroen Vreeken <pe1rxq at amsat.org>)

- fixed raw yuv output

- added motion rounding support in MPEG-4

- fixed motion bug rounding in MSMPEG4

- added B-frame handling in video core

- added full MPEG-1 decoding support

- added partial (frame only) MPEG-2 support

- changed the FOURCC code for H.263 to "U263" to be able to see the

  +AVI/H.263 file with the UB Video H.263+ decoder. MPlayer works with

  this +codec ;) (JuanJo).

- Halfpel motion estimation after MB type selection (JuanJo)

- added pgm and .Y.U.V output format

- suppressed 'img:' protocol. Simply use: /tmp/test%d.[pgm|Y] as input or

  output.

- added pgmpipe I/O format (original patch from Martin Aumueller

  <lists at reserv.at>, but changed completely since we use a format

  instead of a protocol)

version 0.4.2:

- added H.263/MPEG-4/MSMPEG4 decoding support. MPEG-4 decoding support

  (for OpenDivX) is almost complete: 8x8 MVs and rounding are

  missing. MSMPEG4 support is complete.

- added prototype MPEG-1 decoder. Only I- and P-frames handled yet (it

  can decode ffmpeg MPEGs :-)).

- added libavcodec API documentation (see apiexample.c).

- fixed image polyphase bug (the bottom of some images could be

  greenish)

- added support for non clipped motion vectors (decoding only)

  and image sizes non-multiple of 16

- added support for AC prediction (decoding only)

- added file overwrite confirmation (can be disabled with -y)

- added custom size picture to H.263 using H.263+ (Juanjo)

version 0.4.1:

- added MSMPEG4 (aka DivX) compatible encoder. Changed default codec

  of AVI and ASF to DIV3.

- added -me option to set motion estimation method

  (default=log). suppressed redundant -hq option.

- added options -acodec and -vcodec to force a given codec (useful for

  AVI for example)

- fixed -an option

- improved dct_quantize speed

- factorized some motion estimation code

version 0.4.0:

- removing grab code from ffserver and moved it to ffmpeg. Added

  multistream support to ffmpeg.

- added timeshifting support for live feeds (option ?date=xxx in the

  URL)

- added high quality image resize code with polyphase filter (need

  mmx/see optimization). Enable multiple image size support in ffserver.

- added multi live feed support in ffserver

- suppressed master feature from ffserver (it should be done with an

  external program which opens the .ffm url and writes it to another

  ffserver)

- added preliminary support for video stream parsing (WAV and AVI half

  done). Added proper support for audio/video file conversion in

  ffmpeg.

- added preliminary support for video file sending from ffserver

- redesigning I/O subsystem: now using URL based input and output

  (see avio.h)

- added WAV format support

- added "tty user interface" to ffmpeg to stop grabbing gracefully

- added MMX/SSE optimizations to SAD (Sums of Absolutes Differences)

  (Juan J. Sierralta P. a.k.a. "Juanjo" <juanjo at atmlab.utfsm.cl>)

- added MMX DCT from mpeg2_movie 1.5 (Juanjo)

- added new motion estimation algorithms, log and phods (Juanjo)

- changed directories: libav for format handling, libavcodec for

  codecs

version 0.3.4:

- added stereo in MPEG audio encoder

version 0.3.3:

- added 'high quality' mode which use motion vectors. It can be used in

  real time at low resolution.

- fixed rounding problems which caused quality problems at high

  bitrates and large GOP size

version 0.3.2: small fixes

- ASF fixes

- put_seek bug fix

version 0.3.1: added avi/divx support

- added AVI support

- added MPEG-4 codec compatible with OpenDivX. It is based on the H.263 codec

- added sound for flash format (not tested)

version 0.3: initial public release