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Andreas Rheinhardt bd80640cae avformat/oggdec: Don't skip over data whose checksum is used 
The behavior of the ffio_*_checksum feature is not well defined
when using avio_skip(). The code in oggdec.c relied on the skipped
data (four bytes) to be checksummed, which is mostly true
because short_seek_threshold is 32768 by default, so that
avio_seek() will normally read data instead of calling the
underlying seek function. Yet this has two problems:

a) It relies on implementation details of avio_seek().
b) There is an exception, namely if the AVIO_FLAG_DIRECT is set.
In this case the underlying seek function (if set) is always
called and the data is skipped, leading to CRC errors.

So don't skip the data.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2025-09-15 17:52:21 +02:00
.forgejo forgejo: make aarch64 asm linter part of pre-commit 2025-09-13 20:58:29 +00:00
compat compat/w32pthreads: fix compatibility with C++ 2025-09-14 11:45:11 +00:00
doc vf_colorspace: Add an option to clamp trc LUT output 2025-09-15 14:39:09 +00:00
ffbuild configure: properly split C/CXX and CPP flags 2025-09-14 11:45:11 +00:00
fftools fftools: use fopen_utf8 to open FFREPORT 2025-09-10 11:38:43 +00:00
libavcodec avcodec/rkmppdec: fix return EAGAIN during flushing 2025-09-14 21:35:54 +08:00
libavdevice Bump versions for master after release/8.0 2025-08-09 18:03:05 +02:00
libavfilter vf_colorspace: Add an option to clamp trc LUT output 2025-09-15 14:39:09 +00:00
libavformat avformat/oggdec: Don't skip over data whose checksum is used 2025-09-15 17:52:21 +02:00
libavutil avutil/tests/aes_ctr: extend the test to cover payloads smaller than a block 2025-09-11 18:32:24 -03:00
libswresample swresample/resample, soxr_resample: Use designated initializers 2025-09-13 21:25:40 +00:00
libswscale swscale/ops_tmpl_int: remove unused arguments from wrap read decl 2025-09-13 19:12:44 +02:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests build: link with CXX when -lstdc++ on linker commandline 2025-09-14 11:45:11 +00:00
tools forgejo: make aarch64 asm linter part of pre-commit 2025-09-13 20:58:29 +00:00
.gitattributes gitattributes: End merge conflicts in Changelog 2025-03-17 15:26:10 +01:00
.gitignore forgejo/workflows: add initial rudimentary CI 2025-07-22 20:06:20 +02:00
.mailmap mailmap: add entry for myself 2025-08-08 21:51:15 +00:00
Changelog avfilter: add gfxcapture, Windows.Graphics.Capture based window/monitor capture 2025-09-14 11:45:11 +00:00
configure configure: also initialize objcflags_filter early 2025-09-15 15:50:11 +00:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3 Add configure option to upgrade (L)GPL to version 3. 2009-06-05 11:04:03 +00:00
COPYING.LGPLv2.1 all: fix whitespace/new-line issues 2025-08-03 13:48:47 +02:00
COPYING.LGPLv3 Add configure option to upgrade (L)GPL to version 3. 2009-06-05 11:04:03 +00:00
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
FUNDING.json Add FUNDING.json 2025-06-23 14:48:40 +02:00
INSTALL.md all: fix typos found by codespell 2025-08-03 13:48:47 +02:00
LICENSE.md Remove libpostproc 2025-05-07 15:35:47 +02:00
MAINTAINERS MAINTAINERS: Update the entries for AMF 2025-09-05 17:52:46 +02:00
Makefile build: link with CXX when -lstdc++ on linker commandline 2025-09-14 11:45:11 +00:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE RELEASE: update to 8.0 2025-08-14 08:42:29 -04:00

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.