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- ┌───────────────────────────────────────────┐
- │ RELEASE NOTES for FFmpeg 2.3 "Mandelbrot" │
- └───────────────────────────────────────────┘
- The FFmpeg Project proudly presents FFmpeg 2.3 "Mandelbrot", a major
- release with all the great features committed during the three-month period
- since the release of FFmpeg 2.2.
- In this release, there are lots of internal overhauls that make FFmpeg a
- more accessible project for new developers. Many important new
- optimizations and features like QTKit and AVFoundation input devices are
- committed. Contributions done by Libav such as a new native Opus decoder
- are also merged.
- Because of the increasing difficulty to maintain and lack of maintainers,
- we are very sorry to say that we have removed all Blackfin and SPARC
- architecture assembly optimizations with the cleanups done. If you are
- interested in maintaining optimization for these two architecture, feel
- free to contact us and we will restore the code!
- Oh, and since this release, this modern-looking release note is provided in
- addition to the old-style Changelog file, to make it easier for you to
- focus on the most important features in this release.
- Enjoy!
- ┌────────────────────────────┐
- │ * API Information │
- └────────────────────────────┘
- FFmpeg 2.3 is completely source-compatible to the FFmpeg 2.2 series. There
- are however some API deprecations that you need to take care of. Use `git
- diff n2.2 n2.3 doc/APIchanges` to show the list of added and deprecated
- APIs. FFmpeg 2.3 includes the following library versions:
- • libavutil 52.92.100
- • libavcodec 55.69.100
- • libavformat 55.48.100
- • libavdevice 55.13.102
- • libavfilter 4.11.100
- • libswscale 2. 6.100
- • libswresample 0.19.100
- • libpostproc 52. 3.100
- Please refer to the doc/APIChanges file for more information.
- ┌────────────────────────────┐
- │ New Optimization │
- └────────────────────────────┘
- We are excited to announce that we have committed new x86 assembly
- optimization for HEVC, and FFmpeg's audio resampler libswresample. ARM
- users will get a boost in MLP/TrueHD decoding thanks to new optimization.
- Decoding Huffyuv also got a major boost from optimization on the C code.
- Of special interest for Microsoft Visual Studio users, we have also
- converted some preexisting x86 assembly to NASM/Yasm format compatible
- with MSVC setup, especially in the area of audio resampling.
- Another major feature in this release is the introduction of AArch64
- (ARMv8) assembly optimization. AArch64 is another name for the first
- 64-bit ARM architecture, used by Apple A7 SoC inside iPhone 5S. Some
- 32-bit ARM assembly has already been ported to AArch64, but more work is
- underway.
- ┌────────────────────────────┐
- │ Native Opus decoder │
- └────────────────────────────┘
- Opus is an open audio format jointly developed by Xiph.Org, Mozilla,
- Skype/Microsoft, and Broadcom. It combines the features of the Skype Cilk
- speech codec and the Xiph.Org CELT music codec into one low-latency
- codec. Decoding Opus is already possible since FFmpeg 1.0 using the
- libopus library, but the new Opus native decoder brings a higher level of
- stability and speed.
- ┌────────────────────────────┐
- │ QTKit and AVFoundation │
- └────────────────────────────┘
- For OS X users, the new QTKit and AVFoundation devices allow you to use
- the integrated camera on Macs. AVFoundation is a newer API only available
- on OS X 10.7 "Lion" or newer. For users with older OS X systems, the
- QTKit device using the older OS X API is for you.
- ┌────────────────────────────┐
- │ API Additions │
- └────────────────────────────┘
- In this release, stream side data are introduced as AVStream.side_data as
- a way to store miscellaneous stream-wide information. The format is
- similar to the previously anonymous structure AVPacket.side_data (now
- named as AVPacketSideData). With this change, audio ReplayGain
- information and video rotation matrix are now exported through this API,
- if available in the demuxer.
- We also have improved libswresample's Doxygen API documentation, so new
- developers wishing to use FFmpeg's excellent libraries can get started
- more easily and faster.
- ┌────────────────────────────┐
- │ Last But Not Least │
- └────────────────────────────┘
- Other interesting new features including hqx video filter, a pixel art
- scaling filter; a fixed-point AC-3 decoder contributed by Imagination
- Technologies; an On2 TrueMotion VP7 video decoder; an HTML5 WebVTT
- subtitle encoder that allows creation of WebVTT from any text-based
- subtitles; and an 1-bit Direct Stream Digital audio decoder.
- ┌────────────────────────────┐
- │ ★ List of New Features │
- └────────────────────────────┘
- ┌────────────────────────────┐
- │ Command line tools │
- └────────────────────────────┘
- • Support for decoding through DXVA2 in ffmpeg
- ┌────────────────────────────┐
- │ libavcodec │
- └────────────────────────────┘
- • AC3 fixed-point decoding
- • VP7 video decoder
- • Alias PIX image encoder and decoder
- • Improvements to the BRender PIX image decoder
- • Improvements to the XBM decoder
- • Improvements to OpenEXR image decoder
- • Support decoding 16-bit RLE SGI images
- • Direct Stream Digital (DSD) decoder
- • On2 AVC (Audio for Video) decoder
- • Native Opus decoder
- • WebVTT encoder
- ┌────────────────────────────┐
- │ libavdevice │
- └────────────────────────────┘
- • QTKit input device
- • GDI screen grabbing for Windows
- • AVFoundation input device
- ┌────────────────────────────┐
- │ libavformat │
- └────────────────────────────┘
- • subfile protocol
- • Phantom Cine demuxer
- • Alternative rendition support for HTTP Live Streaming
- • Magic Lantern Video (MLV) demuxer
- • Image format auto-detection
- • LRC lyric file demuxer and muxer
- • Samba protocol (via libsmbclient)
- • WebM DASH Manifest muxer
- ┌────────────────────────────┐
- │ libavfilter │
- └────────────────────────────┘
- • shuffleplanes filter
- • libbs2b-based stereo-to-binaural audio filter
- • showcqt multimedia filter
- • zoompan filter
- • signalstats filter
- • hqx filter (hq2x, hq3x, hq4x)
- • flanger filter
- • libfribidi support in drawtext
- ┌────────────────────────────┐
- │ ⚠ Behaviour changes │
- └────────────────────────────┘
- • libx264 reference frames count is now limited depending on level chosen
- • Because of the new image format auto-detection feature, you don't need to
- specify image format when decoding an image with no extension.
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