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Release Notes
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=============
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* 9 "Plain Nine"
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General notes
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-------------
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From this release onwards, we have decided to drop the leading zero from our
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release numbers. There were no plans of ever changing it, so it carried no
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information. Thus this release is just a plain 9, the next will be 10 etc.
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A new library arrived in Libav during this development cycle -- its name is
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libavresample and it handles audio conversion and mixing. All users are
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encouraged to use it instead of the old, now deprecated, audio conversion
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API in libavcodec.
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The libpostproc library now resides in a separate tree. It was fully independent
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of the other Libav libraries, not used by any of the tools and saw very little
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development. For these reasons we decided that it has no place in Libav. A
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standalone Git tree is available at http://git.videolan.org/?p=libpostproc.git
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for people wishing to use libpostproc.
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The major versions of the libavcodec, libavformat and libavfilter libraries have
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been bumped, so they are not API or ABI compatible with the 0.8 release. The
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ffmpeg transcoding tool, kept for compatibility in 0.8, has also been dropped.
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This release brings a number of significant changes in the libavfilter library.
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Firstly, all the API dealing with filter internals is no longer public. The
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result is that creating user-side filters will not be supported until
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libavfilter is more mature.
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Secondly, full audio filtering support is now available along with a set of
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basic audio filters. We hope that their number will soon grow significantly.
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The avconv transcoding tool has of course been extended to handle audio
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filtering as well.
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There were a number of other API changes, most importantly the addition of
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the buffer sink public API.
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In the libavcodec library, one of the most notable changes is added support for
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planar audio (i.e. not interleaved). Many decoders and encoders, that previously
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did inefficient (de)interleaving internally, now only work with planar audio
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formats. Libavresample can be used for optimized conversion between interleaved
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and planar formats.
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Of big interest to our Windows users, Libav now supports building with the MSVC
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compiler. Since MSVC does not support C99 features used extensively by Libav,
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this has been accomplished using a converter that turns C99 code to C89. See the
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platform-specific documentation for more detailed documentation on building
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Libav with MSVC.
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As usual, this release also contains support for some new formats, many smaller
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new features and countless bug fixes. We can highlight Opus decoding / encoding
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through libopus, encoders for Apple ProRes and Ut Video, WMA Lossless and
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RealAudio Lossless decoders, fragmented MOV/MP4 and ISMV (Smooth Streaming)
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muxers, 24-bit FLAC encoding, a large number of RTMP improvements and support
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for cover art in ID3v2, WMA, MP4 and FLAC.
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See the Changelog file for a 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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[libavcodec]:
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* New video encoding API, similar to the previously introduced audio encoding
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API, which encodes from an AVFrame to an AVPacket, thus allowing it to
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properly output timing information and side data.
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* All CODEC_ID_* symbols now carry AV_ prefixes. Non-prefixed codec IDs are
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deprecated.
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* New codec descriptor API, which allows getting the properties of a given codec
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(identified by its ID), without referring to a specific decoder or encoder.
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* An AVFrame must now be freed with a dedicated function, avcodec_free_frame().
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[libavutil]:
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* New audio FIFO API, which simplifies managing/merging/splitting audio buffers.
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* new int/float type punning API
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[libavfilter]:
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* All filter internals were hidden.
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* audio filtering.
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* new buffer sink API for getting frames out of libavfilter.
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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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