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Leo Izen 784aa09fa8
avcodec/exif: parse additional EXIF IFDs 
Most EXIF metadata is in IFD0 and most EXIF payloads only contain
one IFD, but it is possible for there to be more IFDs after the
existing trailing one. exiftool and similar software report these IFDs
as IFD1, IFD2, etc. This commit reads those additional IFDs and attaches
them as dummy entries in the top-level IFD ranging from 0xFFFC down to
0xFFED, which are unused by the EXIF spec. The EXIF API is only able to
return and work with a single IFD, so by attaching it as a subdirectory
this metadata can be preserved.

This is done transparently through the read/write process. Upon parsing
an additional IFD1, it will be attached, but it will be written with
av_exif_write after IFD0 rather than as a subdirectory, as intended.

Existing files without more than one IFD, i.e. most files, will be unaffected
by this change, as well as API clients looking to parse specific fields, but
now more metadata is parsed and written, rather than simply being discarded
as trailing data.

Signed-off-by: Leo Izen <leo.izen@gmail.com>
2025-12-20 11:53:23 -05:00
.forgejo forgejo/workflows: fix error handling of configure result 2025-12-17 13:28:21 +00:00
compat compat: Fix .def file generation for ARM64EC builds on Windows 2025-12-19 10:01:16 +00:00
doc fate.sh: Allow specifying --ar through a separate variable 2025-12-19 18:41:23 +00:00
ffbuild configure: add detection of assembler support for SME 2025-12-09 21:38:38 +00:00
fftools ffprobe: Include the RFC 4281 "mime codec string" in show_stream output 2025-12-12 18:40:01 +02:00
libavcodec avcodec/exif: parse additional EXIF IFDs 2025-12-20 11:53:23 -05:00
libavdevice avdevice/gdigrab: suppress int to pointer cast warning 2025-12-03 23:45:44 +00:00
libavfilter lavfi/vf_blackdetect: R-V V count_pixels_16 2025-12-16 17:30:29 +02:00
libavformat avformat/whip: Fix leak of dtls_fingerprint 2025-12-19 21:45:24 +01:00
libavutil avutil/log: use atomics to load and store logging level, flags and callback pointer 2025-12-13 21:33:11 +00:00
libswresample swresample/soxr_resample: pass initialized data to soxr_process() in flush() 2025-12-08 21:31:13 +00:00
libswscale swscale/ops: update comment on SWS_COMP_EXACT 2025-12-20 13:52:45 +00:00
presets
tests avcodec/exif: parse additional EXIF IFDs 2025-12-20 11:53:23 -05:00
tools tools/sofa2wavs: fix build on Windows 2025-11-29 21:43:12 +00:00
.gitattributes
.gitignore .gitignore: Add config_components.asm 2025-11-02 13:10:58 +00:00
.mailmap mailmap: add entry for myself 2025-08-08 21:51:15 +00:00
Changelog avformat: add a raw JPEG-XS muxer and demuxer 2025-12-13 19:03:36 -03:00
configure configure: Recognize uname "Windows_NT" as using an .exe suffix 2025-12-19 18:38:33 +00:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1 all: fix whitespace/new-line issues 2025-08-03 13:48:47 +02:00
COPYING.LGPLv3
CREDITS
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
MAINTAINERS MAINTAINERS: Update the entries for AMF 2025-10-28 21:06:37 +00:00
Makefile configure: add detection of assembler support for SME 2025-12-09 21:38:38 +00:00
README.md
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.