mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
75 lines
3.3 KiB
Plaintext
75 lines
3.3 KiB
Plaintext
Release Notes
|
|
=============
|
|
|
|
* 12 "Not Enough Trocadero"
|
|
|
|
General notes
|
|
-------------
|
|
|
|
This release once again bumps the major versions of all the libraries, removing
|
|
some long-deprecated APIs. This means that it is neither API nor ABI-compatible
|
|
with the previous release. The users who still did not update their code are
|
|
advised to look at the next section of these release notes, the doc/APIchanges
|
|
file and the API migration guide on our wiki. If those are not sufficient, do
|
|
not hesitate to contact us on IRC or through the user mailing list.
|
|
|
|
Among the main highlights of this release are several additions related to
|
|
hardware acceleration. There is a new API for managing hardware devices and
|
|
frame pools, which allows to add new features such as zero-copy
|
|
hardware-accelerated filtering with libavfilter and should reduce the
|
|
boilerplate code required for existing hardware-accelerated decoders. We have
|
|
added QuickSync decoding and encoding, NVENC encoding and CUDA image scaling,
|
|
VAAPI encoding and image scaling, OpenMAX encoding, MMAL decoding and Direct3D11
|
|
decoding.
|
|
|
|
Other significant additions not related to hardware acceleration include
|
|
decoders for Canopus HQ/HQA and HQX, Go2Meeting, AAC ELD, TDSC, Hap, DXV, SPV1,
|
|
and a new ASF demuxer written according to the specification. There were also
|
|
countless smaller changes and bug fixes.
|
|
|
|
See the Changelog file for a more extensive list of significant changes.
|
|
|
|
API changes
|
|
-----------
|
|
|
|
A number of additional APIs have been introduced and some existing functions
|
|
have been deprecated and are scheduled for removal in the next release.
|
|
Significant API changes include:
|
|
|
|
[libavcodec]
|
|
+ Added an object for storing codec parameters (AVCodecParameters) and its
|
|
related API. It will now replace AVCodecContext everywhere except the actual
|
|
encoders/decoders.
|
|
+- Added a new API for handling refcounted AVPackets, mirroring the AVFrame API.
|
|
Deprecated certain old ill-defined AVPacket functions.
|
|
+- Added a new API for audio/video encoding and decoding, with decoupled input
|
|
and output. This will e.g. allow a decoder to produce multiple output frames
|
|
for a single input packet, which was not possible with the previous API. All
|
|
users are strongly encouraged to switch to this new API as soon as possible,
|
|
since certain decoders and encoders might start requiring the new API to be
|
|
used.
|
|
+- Added a new API for bitstream filtering, which works with refcounted
|
|
AVPackets and is more clearly defined and documented. The old bitstream
|
|
filtering API is now deprecated.
|
|
|
|
[libavformat]
|
|
+ Added new IO callbacks to AVFormatContext, allowing the caller to provide
|
|
custom IO for certain special muxers and demuxers.
|
|
+- Replaced AVStream.codec (AVCodecContext) with AVStream.codecpar
|
|
(AVCodecParameters) as the means of signalling codec parameters between the
|
|
muxers/demuxers and the caller.
|
|
|
|
[libavutil]
|
|
+ Added a new API (hwcontext.h) for handling hardware acceleration devices and
|
|
hardware frame pools.
|
|
|
|
[libavfilter]
|
|
+ Added a new struct, AVBufferSrcParameters, for passing the stream parameters
|
|
to the buffer source. It is now the recommended way of configuring the buffer
|
|
source.
|
|
+ Added AVFilterContext.hw_device_ctx and AVFilterLink.hw_frames_ctx that allow
|
|
hardware frames to be used in filter graphs.
|
|
|
|
Please see the file doc/APIchanges for details along with similar
|
|
programmer-centric information.
|