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Andreas Rheinhardt 588d258ea4 avformat/matroskaenc: Don't segfault when seekability changes 
If the Matroska muxer's AVIOContext was unseekable when writing the
header, but is seekable when writing the trailer, the code for writing
the trailer presumes that a dynamic buffer exists and tries to update
its content in order to overwrite data that has already been
preliminarily written when writing the header, yet said buffer doesn't
exist as it has been written finally and not preliminarily when writing
the header (because of the unseekability it was presumed that one won't
be able to update the data anyway).

This commit adds a check for this and also for a similar situation
involving updating extradata with new data from packet side-data.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit 8aabcf6c11)
2020-05-20 10:51:30 +02:00
compat compat/cuda: Change inclusion guards 2019-08-05 12:11:48 +02:00
doc Update for FFmpeg 4.2.2 2019-12-31 21:19:06 +01:00
ffbuild build: add support for building CUDA files with clang 2019-08-04 19:16:59 +02:00
fftools fftools/ffmpeg: Free swresample dictionary during cleanup 2020-05-20 10:51:29 +02:00
libavcodec avcodec/mediacodec_wrapper: fix {input,output}_buffers global reference leak 2020-05-20 09:35:58 +02:00
libavdevice Bump minor versions to separate 4.2 from master 2019-07-21 18:36:18 +02:00
libavfilter avfilter/vf_dedot: Fix leak of AVFrame if making it writable fails 2020-05-20 10:51:29 +02:00
libavformat avformat/matroskaenc: Don't segfault when seekability changes 2020-05-20 10:51:30 +02:00
libavresample avresample: remove deprecated attribute from the AVAudioResampleContext struct 2018-01-09 10:56:53 -03:00
libavutil avutil/encryption_info: Don't pass NULL to memcpy 2020-05-20 03:19:02 +02:00
libpostproc Bump minor versions to separate 4.2 from master 2019-07-21 18:36:18 +02:00
libswresample Bump minor versions to separate 4.2 from master 2019-07-21 18:36:18 +02:00
libswscale swscale/utils: Fix invalid left shifts of negative numbers 2020-05-20 03:44:07 +02:00
presets
tests tests/fate/lavf-video.mak: fix fate-lavf-gif dependencies 2020-05-19 17:17:35 +02:00
tools tools/target_dec_fuzzer: Free parser in case of avcodec_open2() failure 2019-07-21 12:33:35 +02:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore tools/python: add script to convert TensorFlow model (.pb) to native model (.model) 2019-07-01 10:23:47 -03:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog Update for FFmpeg 4.2.2 2019-12-31 21:19:06 +01:00
configure configure: bump year 2020-05-19 17:17:35 +02:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md INSTALL.md: Fix Markdown formatting 2019-01-31 10:29:16 -09:00
LICENSE.md LICENSE: Clarify --enable-nonfree. 2019-05-10 01:18:58 +02:00
MAINTAINERS MAINTAINERS: remove myself as mailing list maintainer 2019-03-21 11:34:13 -08:00
Makefile tools: Add fuzzer for demuxers 2019-05-31 22:44:30 +02:00
README.md Remove the ffserver program 2018-01-06 18:31:37 +00:00
RELEASE Update for FFmpeg 4.2.2 2019-12-31 21:19:06 +01:00
RELEASE_NOTES RELEASE_NOTES: Based on the version from 4.1 2019-07-21 18:58:41 +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 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.