mirror of https://git.ffmpeg.org/ffmpeg.git
Add a release note for 2.3
Based on a patch by Clément Bœsch <u@pkh.me>. Signed-off-by: Timothy Gu <timothygu99@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Timothy Gu
Michael Niedermayer
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┌─────────────────────────────────┐
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│ RELEASE NOTES for FFmpeg 2.3 │
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└─────────────────────────────────┘
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The FFmpeg Project proudly presents FFmpeg 2.3, a major release with all
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the great features committed during the three-month period since the
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release of FFmpeg 2.2.
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In this release, there are lots of internal overhauls that make FFmpeg a
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more accessible project for new developers. Many important new features
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like native Opus decoder and QTKit and AVFoundation input devices are also
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committed.
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Because of the increasing difficulty to maintain and lack of maintainers,
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we are very sorry to say that we have removed all Blackfin and SPARC
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architecture assembly optimizations with the cleanups done. If you are
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interested in maintaining optimization for these two architecture, feel
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free to contact us and we will restore the code!
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Since this release, the traditional Changelog file is upgraded to this
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modern-looking release note. Old changelogs are moved to doc/Changelog.old.
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Enjoy!
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┌────────────────────────────┐
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│ * API Information │
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└────────────────────────────┘
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FFmpeg 2.3 is completely source-compatible to the FFmpeg 2.2 series. There
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are however some API deprecations that you need to take care of. Use `git
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diff n2.2 n2.3 doc/APIchanges` to show the list of added and deprecated
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APIs. FFmpeg 2.3 includes the following library versions:
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• libavutil xx.yy.1zz
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• libavcodec xx.yy.1zz
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• libavformat xx.yy.1zz
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• libavdevice xx.yy.1zz
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• libavfilter xx.yy.1zz
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• libswscale xx.yy.1zz
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• libswresample xx.yy.1zz
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• libpostproc xx.yy.1zz
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Please refer to the doc/APIChanges file for more information.
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┌────────────────────────────┐
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│ New Optimization │
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└────────────────────────────┘
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We are excited to announce that we have committed new x86 assembly
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optimization for HEVC, and FFmpeg's audio resampler libswresample. ARM
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users will get a boost in MLP/TrueHD decoding thanks to new optimization.
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Decoding Huffyuv also got a major boost from optimization on the C code.
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Of special interest for Microsoft Visual Studio users, we have also
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converted some preexisting x86 assembly to NASM/Yasm format compatible
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with MSVC setup, especially in the area of audio resampling.
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Another major feature in this release is the introduction of AArch64
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(ARMv8) assembly optimization. AArch64 is another name for the first
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64-bit ARM architecture, used by Apple A7 SoC inside iPhone 5S. We have
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already ported some 32-bit ARM to AArch64, but more work is underway.
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┌────────────────────────────┐
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│ Native Opus decoder │
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└────────────────────────────┘
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Opus is an open audio format jointly developed by Xiph.Org, Mozilla,
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Skype/Microsoft, and Broadcom. It combines the features of the Skype Cilk
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speech codec and the Xiph.Org CELT music codec into one low-latency
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codec. Decoding Opus is already possible since FFmpeg 1.0 using the
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libopus library, but the new Opus native decoder brings a higher level of
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stability and speed.
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┌────────────────────────────┐
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│ QTKit and AVFoundation │
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└────────────────────────────┘
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For OS X users, the new QTKit and AVFoundation devices allow you to use
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the integrated camera on Macs. AVFoundation is a newer API only available
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on OS X 10.7 "Lion" or newer. For users with older OS X systems, the
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QTKit device using the older OS X API is for you.
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┌────────────────────────────┐
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│ API Additions │
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└────────────────────────────┘
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In this release, stream side data are introduced as AVStream.side_data as
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a way to store miscellaneous stream-wide information. The format is
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similar to the previously anonymous structure AVPacket.side_data (now
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named as AVPacketSideData). With this change, audio ReplayGain
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information and video rotation matrix are now exported through this API,
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if available in the demuxer.
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We also have improved libswresample's Doxygen API documentation, so new
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developers wishing to use FFmpeg's excellent libraries can get started
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more easily and faster.
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┌────────────────────────────┐
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│ Last But Not Least │
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└────────────────────────────┘
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Other interesting new features including hqx video filter, a pixel art
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scaling filter; a fixed-point AC-3 decoder contributed by Imagination
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Technologies; an On2 TrueMotion VP7 video decoder; an HTML5 WebVTT
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subtitle decoder that allows creation of WebVTT from any text-based
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subtitles; and an 1-bit Direct Stream Digital audio decoder.
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┌────────────────────────────┐
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│ ★ List of New Features │
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└────────────────────────────┘
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┌────────────────────────────┐
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│ Command line tools │
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└────────────────────────────┘
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• Support for decoding through DXVA2 in ffmpeg
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┌────────────────────────────┐
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│ libavcodec │
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└────────────────────────────┘
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• AC3 fixed-point decoding
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• VP7 video decoder
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• Alias PIX image encoder and decoder
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• Improvements to the BRender PIX image decoder
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• Improvements to the XBM decoder
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• Improvements to OpenEXR image decoder
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• Support decoding 16-bit RLE SGI images
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• Direct Stream Digital (DSD) decoder
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• On2 AVC (Audio for Video) decoder
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• Native Opus decoder
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• WebVTT encoder
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┌────────────────────────────┐
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│ libavdevice │
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└────────────────────────────┘
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• QTKit input device
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• GDI screen grabbing for Windows
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• AVFoundation input device
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┌────────────────────────────┐
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│ libavformat │
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└────────────────────────────┘
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• subfile protocol
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• Phantom Cine demuxer
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• Alternative rendition support for HTTP Live Streaming
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• Magic Lantern Video (MLV) demuxer
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• Image format auto-detection
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• LRC lyric file demuxer and muxer
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• Samba protocol (via libsmbclient)
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┌────────────────────────────┐
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│ libavfilter │
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└────────────────────────────┘
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• shuffleplanes filter
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• libbs2b-based stereo-to-binaural audio filter
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• showcqt multimedia filter
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• zoompan filter
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• signalstats filter
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• hqx filter (hq2x, hq3x, hq4x)
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• flanger filter
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┌────────────────────────────┐
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│ ⚠ Behaviour changes │
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└────────────────────────────┘
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• libx264 reference frames count is now limited depending on level chosen
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• Because of the new image format auto-detection feature, you don't need to
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specify image format when decoding an image with no extension.
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