[FFmpeg-devel] [PATCH] Add a release note for 2.3
Timothy Gu
timothygu99 at gmail.com
Sun Jul 13 00:51:07 CEST 2014
On Sat, Jul 12, 2014 at 3:08 AM, Clément Bœsch <u at pkh.me> wrote:
> On Fri, Jul 11, 2014 at 09:08:40PM -0700, Timothy Gu wrote:
>> Based on a patch by Clément Bœsch <u at pkh.me>.
>>
>> Signed-off-by: Timothy Gu <timothygu99 at gmail.com>
>> ---
>>
>> So, I rebased Clément's original patch and added (a lot) more stuff to make it
>> a real official modern-looking release note. Some stuff I am not sure about:
>>
>> - Should we use Clément's format with all kinds of Unicode characters or
>> stick to Markdown?
>
> We don't really render Markdown anywhere; here we can just link to the
> raw on the repository and have a decent layout. We don't need complex
> markup, unless we want to link to commit hashes or stuff?
OK. But the next two questions still stand.
>
>> - Does the new image auto-detection really work as advertised in "Behaviour
>> changes" section?
>> - Is there any stuff I missed in the "Behaviour changes" section? (I'm sure
>> there are.)
----8<----
Based on a patch by Clément Bœsch <u at pkh.me>.
Signed-off-by: Timothy Gu <timothygu99 at gmail.com>
---
RELEASE_NOTES | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 157 insertions(+)
create mode 100644 RELEASE_NOTES
diff --git a/RELEASE_NOTES b/RELEASE_NOTES
new file mode 100644
index 0000000..5d2830e
--- /dev/null
+++ b/RELEASE_NOTES
@@ -0,0 +1,157 @@
+ ┌─────────────────────────────────┐
+ │ RELEASE NOTES for FFmpeg 2.3 │
+ └─────────────────────────────────┘
+
+ The FFmpeg Project proudly presents FFmpeg 2.3, a new release 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.
+
+ In this release, there are lots of internal overhauls that make FFmpeg a
+ more accessible project for new developers. Many important new features
+ like native Opus decoder and QTKit and AVFoundation input devices are also
+ committed.
+
+ 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. We have added some
+ x86 optimizations to accelerate the decoding of Huffyuv and HEVC, two very
+ different codecs in terms of age.
+
+ 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 to FFmpeg. If
+ you are interested in maintaining optimization for these two architecture,
+ feel free to contact us and we will restore the code!
+
+ Since this release, the traditional Changelog file is upgraded to this
+ modern-looking release note. Old change logs are moved to
+ doc/Changelog.old.
+
+ Enjoy!
+
+ ┌────────────────────────────┐
+ │ 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; a VP7 video decoder; an HTML5 WebVTT subtitle decoder that
+ allows creation of WebVTT from any text-based subtitles; and an 1-bit
+ Direct Stream Digital audio decoder.
+
+ ┌────────────────────────────┐
+ │ * API Information │
+ └────────────────────────────┘
+
+ FFmpeg 2.3 includes the following library versions:
+
+ • libavutil xx.yy.1zz
+ • libavcodec xx.yy.1zz
+ • libavformat xx.yy.1zz
+ • libavdevice xx.yy.1zz
+ • libavfilter xx.yy.1zz
+ • libswscale xx.yy.1zz
+ • libswresample xx.yy.1zz
+ • libpostproc xx.yy.1zz
+
+ Please refer to the doc/APIChanges file for more information.
+
+ ┌────────────────────────────┐
+ │ ★ 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
+
+ ┌────────────────────────────┐
+ │ libavfilter │
+ └────────────────────────────┘
+
+ • shuffleplanes filter
+ • libbs2b-based stereo-to-binaural audio filter
+ • showcqt multimedia filter
+ • zoompan filter
+ • signalstats filter
+ • hqx filter (hq2x, hq3x, hq4x)
+ • flanger filter
+
+ ┌────────────────────────────┐
+ │ ⚠ 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.
\ No newline at end of file
--
1.9.1
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