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Martin Storsjö 847190ebd9 configure: Don't assume an aligned stack on clang on windows 
If we'd enable a 16 byte aligned stack, clang/llvm would also assume
that alignment everywhere and produce code that strictly requires it.
That would require adding realignment (via attribute_align_arg) on every
single public library function or enable -mstackrealign (which does the
same on every single function).

Also relatedly; the parameter currently tested (-mllvm
-stack-alignment=16) hasn't actually been supported for quite some
time; current clang versions use -mstack-alignment=16 for the same.
Actually testing for that parameter would be a different change
though, since it has a real risk of changing behaviour on any other
platform where clang is used.

Signed-off-by: Martin Storsjö <martin@martin.st>
 		2018-03-13 15:25:12 +02:00
avbuild build: Add missing config.sh dependency for pkg-config files 2017-11-09 15:22:03 +01:00
avtools cmdutils: update copyright year to 2018 2018-01-01 02:51:51 -05:00
compat makedef: Pass EXTERN_PREFIX from configure to makedef 2017-11-16 16:54:08 +02:00
doc Add AV1 video decoding support through libaom 2018-03-12 08:12:43 +01:00
libavcodec Support AV1 encoding using libaom 2018-03-12 12:10:33 +01:00
libavdevice Remove dv1394 input device 2017-10-13 23:57:59 +02:00
libavfilter vf_hwupload/hwmap: Support setting a fixed pool size 2018-02-11 22:11:10 +00:00
libavformat ivf: Support VP9 and AV1 as well 2018-03-12 08:12:43 +01:00
libavresample Bump major versions of all libraries 2017-03-23 09:56:20 +01:00
libavutil qsv: Default PicStruct to progressive 2018-02-22 11:24:12 +01:00
libswscale build: Drop check for sys/mman.h in favor of mmap() check 2017-10-10 23:20:16 +02:00
presets
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tests fate: Error out more gracefully on configure failure 2018-02-26 13:30:05 +01:00
tools aviocat: Check for output write errors 2017-09-04 09:42:52 +03:00
.gitattributes
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.gitignore build: Ignore generated .version files 2017-02-03 11:37:53 +01:00
.travis.yml travis: Exclude gcc for the macOS target 2017-04-20 12:53:08 +02:00
COPYING.GPLv2
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COPYING.GPLv3
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COPYING.LGPLv2.1
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COPYING.LGPLv3
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CREDITS
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Changelog Add AV1 video decoding support through libaom 2018-03-12 08:12:43 +01:00
INSTALL
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LICENSE Remove the legacy X11 screen grabber 2016-07-29 19:03:10 +02:00
Makefile Makefile: fix distclean target 2017-11-14 10:09:40 -03:00
README.md
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RELEASE Make the RELEASE file match with the most recent tag 2016-10-14 13:52:51 -04:00
configure configure: Don't assume an aligned stack on clang on windows 2018-03-13 15:25:12 +02:00

README.md

Libav

Build Status

Libav is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libavresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • avconv is a command line toolbox to manipulate, convert and stream multimedia content.
  • avplay is a minimalistic multimedia player.
  • avprobe is a simple analisys tool to inspect multimedia content.
  • Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Conding examples are available in the doc/example directory.

License

Libav codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.