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Anton Khirnov d2096679d5 compat/w32pthreads: change pthread_t into pointer to malloced struct 
pthread_t is currently defined as a struct, which gets placed into
caller's memory and filled by pthread_create() (which accepts a
pthread_t*).

The problem with this approach is that pthread_join() accepts pthread_t
itself rather than a pointer to it, so it gets a _copy_ of this
structure. This causes non-deterministic failures of pthread_join() to
produce the correct return value - depending on whether the thread
already finished before pthread_join() is called (and thus the copy
contains the correct value), or not (then it contains 0).

Change the definition of pthread_t into a pointer to a struct, that gets
malloced by pthread_create() and freed by pthread_join().

Fixes random failures of fate-ffmpeg-error-rate-fail on Windows after
433cf391f5.

See also [1] for an alternative approach that does not require dynamic
allocation, but relies on an assumption that the pthread_t value
remains in a fixed memory location.

[1] 23829dd2b2

Reviewed-By: Martin Storsjö <martin@martin.st>
2024-12-16 09:43:19 +01:00
compat compat/w32pthreads: change pthread_t into pointer to malloced struct 2024-12-16 09:43:19 +01:00
doc lavc/packet: add API for an AVPacket-based AVContainerFifo 2024-12-15 14:05:33 +01:00
ffbuild configure: Add wasm as a fake arch 2024-12-04 16:43:06 +08:00
fftools fftools/sync_queue: switch from AVFifo+ObjPool to AVContainerFifo 2024-12-15 14:05:34 +01:00
libavcodec avcodec/libx265: add alpha layer encoding support 2024-12-16 00:50:52 +01:00
libavdevice avdevice/dshow: fix unused variable warning 2024-10-17 13:04:17 +02:00
libavfilter avfilter/af_ashowinfo: fix scaling factor of replaygain peak values 2024-12-07 12:03:53 -05:00
libavformat avformat/hevc: add support for writing alpha layer 2024-12-16 00:50:52 +01:00
libavutil lavc/container_fifo: move to lavu and make public 2024-12-15 14:05:15 +01:00
libpostproc */version.h: bump after release/7.1 branch 2024-09-24 17:10:35 +02:00
libswresample arm: Consistently use proper interworking function returns 2024-10-09 15:52:51 +03:00
libswscale tests/swscale: fix sscanf return value check 2024-12-11 09:10:45 +01:00
presets
tests fftools/ffprobe: add analyze_frames option for CC and grain detection 2024-12-13 22:41:31 -06:00
tools tools/general_assembly: exclude Derek from GA emails 2024-11-28 15:51:37 +01:00
.gitattributes lavf/assenc: normalize line endings to \n 2024-02-11 17:01:07 -08:00
.gitignore .gitignore: add exclusions for shader .c files 2024-11-18 07:54:21 +01:00
.mailmap mailmap: add entry for myself 2024-07-15 01:59:37 +02:00
Changelog avcodec/libx265: add alpha layer encoding support 2024-12-16 00:50:52 +01:00
configure configure: add leaddec blockdsp dependency 2024-12-11 07:52:25 +11:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
INSTALL.md INSTALL: explain the circular dependency issue and solution 2024-11-03 19:35:23 +01:00
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS MAINTAINERS: Lauri is still available but is really low on time nowadays 2024-11-28 23:19:00 +01:00
Makefile configure: Add wasm as a fake arch 2024-12-04 16:43:06 +08:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE RELEASE: update release number after release/7.1 branch 2024-10-09 01:55:50 +02:00

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 means to alter decoded audio and video through a directed graph of connected 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.