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Release Notes
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=============
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* 10 "Eks"
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General notes
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-------------
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One of the main features of this release is the addition of reference-counted
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data buffers to Libav and their use in various structures. Specifically, the
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data buffers used by AVPacket and AVFrame can now be reference counted, which
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should allow to significantly simplify many use cases. In addition,
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reference-counted AVFrames can now be used in libavfilter, avoiding the need
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for a separate libavfilter-specific frame structure. Frames can now be passed
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straight from the decoders into filters or from filters to encoders.
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These additions made it necessary to bump the major versions of libavcodec,
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libavformat, libavdevice, libavfilter, and libavutil, which was accompanied by
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dropping some old deprecated APIs. These libraries are thus not ABI- or API-
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compatible with the previous release. All the other libraries (libavresample
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and libswscale) should be both ABI- and API-compatible.
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Another major point is the inclusion of the HEVC (AKA H.265, the successor of
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H.264) decoder in the main codebase. It was started in 2012 as a Libav Google
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Summer of Code project by Guillaume Martres and subsequently completed with
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the assistance of the OpenHEVC project and several Libav developers.
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As usual, this release also contains support for other new formats, many smaller
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new features and countless bug fixes. We can highlight a native VP9 decoder,
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with encoding provided through libvpx, native decoders for WebP, JPEG 2000, and
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AIC, as well as improved WavPack support with encoding through libwavpack,
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support for more AAC flavors (LD - low delay, ELD - enhanced low delay), slice
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multithreading in libavfilter, or muxing chapters in ASF. Furthermore a few new
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filters have been introduced, namely compand, to change audio dynamics, framepack,
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to create stereoscopic videos, asetpts, to set audio pts, and interlace, to convert
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progressive video to interlaced. Finally there is more fine-grained detection of
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host and target libc, which should allow better portability to various cross
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compilation scenarios.
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See the Changelog file for a fuller list of significant changes.
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Please note that our policy on bug reports has not changed. We still only accept
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bug reports against HEAD of the Libav trunk repository. If you are experiencing
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issues with any formally released version of Libav, please try a current version
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of the development code to check if the issue still exists. If it does, make
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your report against the development code following the usual bug reporting
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guidelines.
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API changes
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-----------
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A number of additional APIs have been introduced and some existing functions
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have been deprecated and are scheduled for removal in the next release.
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Significant API changes include:
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[libavutil]
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+ added the reference-counted buffers API (buffers.h)
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+ moved the AVFrame struct to libavutil and added a new API for working with
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reference-counted AVFrames (frame.h)
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[libavcodec]
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+ added an API for working with reference-counted AVPackets (av_packet_*)
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+- converted VDPAU to the hwaccel framework; the old way of using VDPAU is no
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longer supported
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- old audio encoding and decoding APIs removed
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- old video encoding API removed
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- deprecated enum CodecID removed (enum AVCodecID should be used instead)
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- deprecated audio resampling API removed (libavresample should be used
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instead)
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[libavfilter]
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+- replaced AVFilterBufferRef with AVFrame; AVFilterBufferRef and everything
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related to it still exists, but is deprecated
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+ converted all filters to use the AVOptions system for configuration, it is
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now possible to query the supported options, their values and set them
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directly with av_opt_*
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+ added a slice multithreading framework
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+- merged avfiltergraph.h to avfilter.h, using AVFilterGraph is now explicitly
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mandatory (it was implicitly required even before); added new API for
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allocating and initializing filters
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Please see the file doc/APIchanges for details along with similar
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programmer-centric information.
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