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Andreas Rheinhardt 494061a49a avcodec/vp8: Maintain consistency of frame pointers 
Right now it is possible for the pointer for the current frame to
be set in the context even when it could not be properly set up;
this does not influence the ordinary ref frames, but only
VP8Context.prev_frame. And since this code has been ported to the
ProgressFrame API in d48d7bc434,
this leads to segfaults, because the ProgressFrame API is less
forgiving than the ThreadFrame API (waiting on an uninitialized
ProgressFrame segfaults, waiting on an uninitialized ThreadFrame
is a no-op (the code behaves as if frame-threading is not in use)).

Fix this by maintaining the consistency of the frame pointers
in the context (by setting them later).

Fixes: NULL pointer dereference
Fixes: 68192/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP8_fuzzer-6180311026171904

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2025-04-21 16:43:39 +02:00
compat compat/w32pthreads: change pthread_t into pointer to malloced struct 2024-12-16 09:43:19 +01:00
doc avutil/log,hwcontext: Add AV_CLASS_CATEGORY_HWDEVICE 2025-04-21 00:19:11 +02:00
ffbuild configure: add option to select use of response files 2025-03-30 17:22:10 +05:30
fftools fftools/textformat/avtextformat: Remove unused variable 2025-04-17 01:49:04 +02:00
libavcodec avcodec/vp8: Maintain consistency of frame pointers 2025-04-21 16:43:39 +02:00
libavdevice avfoundation: Fix compilation for OSes other than macOS and iOS 2025-04-04 17:12:33 +03:00
libavfilter lavfi/src_movie: set pkt_timebase 2025-04-15 15:49:38 +02:00
libavformat avformat/dump: Print stream start offsets for input streams 2025-04-19 17:05:30 +02:00
libavutil avutil/hwcontext: Add item_name function for AVHWDeviceContext 2025-04-21 00:19:20 +02:00
libpostproc libpostproc: update APIChanges and version for "deprecate the AMD 3DNow" 2025-04-16 13:59:15 +02:00
libswresample libs: bump major version for all libraries 2025-03-28 14:44:34 -03:00
libswscale swscale/x86/rgb2rgb: Deduplicate ASM constants 2025-04-13 22:49:21 +02:00
presets
tests avcodec/magicyuvenc: Fix Huffman element probabilities 2025-04-20 22:04:36 +02:00
tools tools: Fix deprecation warning in patcheck 2025-04-16 13:09:02 +02:00
.gitattributes gitattributes: End merge conflicts in Changelog 2025-03-17 15:26:10 +01:00
.gitignore ffmpeg/repo: Add dot-folders in the repository root to .gitignore 2025-04-19 17:29:12 +02:00
.mailmap mailmap: add entry for myself 2024-07-15 01:59:37 +02:00
Changelog doc/encoders: Document png pred 2025-04-10 03:01:34 +02:00
configure configure: Clearer documentation for "disable-safe-bitstream-reader" 2025-04-16 13:09:03 +02:00
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: Add myself 2025-03-25 11:38:21 +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.