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Avi Halachmi (:avih) 45499e557c configure: speed up check_deps() 
x4 - x25 faster.

check_deps() recursively enables/disables components, and its loop is
iterated nearly 6000 times. It's particularly slow in bash - currently
consuming more than 50% of configure runtime, and about 20% with other
shells.

This commit applies few local optimizations, most effective first:
- Use $1 $2 ... instead of pushvar/popvar, and same at enable_deep*
- Abort early in one notable case - empty deps, to avoid costly no-op.
- Smaller changes which do add up:
  - Handle ${cfg}_checking locally instead of via enable[d]/disable
  - ${cfg}_checking: test done before inprogress - x2 faster in 50%+
  - one eval instead of several at the empty-deps early abort path.

- The "actual work" part is unmodified - just its surroundings.

Biggest speedups (relative and absolute) are observed with bash.

Tested-by: Michael Niedermayer <michael@niedermayer.cc>
Tested-by: Helmut K. C. Tessarek <tessarek@evermeet.cx>
Tested-by: Dave Yeo <daveryeo@telus.net>
Tested-by: Reino Wijnsma <rwijnsma@xs4all.nl>
Signed-off-by: James Almer <jamrial@gmail.com>
2018-08-27 11:34:10 -03:00
compat compat: remove in-tree NVidia headers 2018-02-27 16:22:12 +01:00
doc doc/examples/vaapi_transcode: re-licensed to MIT-license. 2018-08-25 22:09:44 +08:00
ffbuild
fftools ffmpeg: simplify refcounting packets for the muxing queue 2018-08-07 18:42:35 -03:00
libavcodec lavc/encode: fix frame_number double-counted 2018-08-27 16:54:40 +08:00
libavdevice avdevice/decklink_enc: print preroll and buffer size 2018-08-24 10:15:32 +05:30
libavfilter lavfi/avf_concat: switch to activate. 2018-08-26 12:16:48 +02:00
libavformat avformat/mpegts: add missing null pointer checks in ff_parse_mpeg2_descriptor() 2018-08-25 21:50:17 +02:00
libavresample avresample: remove deprecated attribute from the AVAudioResampleContext struct 2018-01-09 10:56:53 -03:00
libavutil avutil/encryption_info: Fix size calculation. 2018-08-15 01:33:45 +02:00
libpostproc Bump minor versions after release/4.0 branching 2018-04-16 12:35:12 +02:00
libswresample swresample/swresample: Fix input channel count in resample_first computation 2018-07-26 02:42:42 +02:00
libswscale swscale/swscale : small cosmetic 2018-08-22 11:36:15 +02:00
presets
tests avformat/movenc: implicitly enable negative CTS offsets for ismv 2018-08-24 21:00:05 +03:00
tools tools/qt-faststart: Allow free atoms after moov atom. 2018-08-01 00:49:54 +02:00
.gitattributes
.gitignore Remove the ffserver program 2018-01-06 18:31:37 +00:00
.travis.yml
Changelog avcodec: add Brooktree ProSumer Video decoder 2018-08-24 21:07:01 +02:00
configure configure: speed up check_deps() 2018-08-27 11:34:10 -03:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: add myself to MIPS section 2018-08-08 01:00:10 +02:00
Makefile avcodec/parser: move parsers list and related API to its own file 2018-07-21 16:08:29 -03:00
README.md Remove the ffserver program 2018-01-06 18:31:37 +00:00
RELEASE

README.md

FFmpeg README

FFmpeg 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.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis 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

Coding examples are available in the doc/examples directory.

License

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

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.