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When building DLLs on ARM64EC, the default use of `dumpbin -linkermember:1` fails because ARM64EC static libraries use a different linker member format. Use `-linkermember:32` for ARM64EC to correctly extract symbols. Additionally, MSVC inserts $exit_thunk and $entry_thunk symbols for ARM64EC to handle x64 ↔ ARM64 transitions. These are internal thunks and must not be exported. Filter them out when generating the .def file to avoid unresolved symbols or invalid exports. Trim out the leading '#' on ARM64EC function symbols. This is only relevant on ARM64EC, but it is benign to do that filtering on all architectures (such symbols aren't expected on other architectures). Simplify the sed command by removing the symbol address with a sed expression instead of a later "cut" command. This ensures correct symbol extraction and stable DLL generation on ARM64EC targets, while keeping behavior unchanged for other Windows architectures.
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides means to alter decoded audio and video through a directed graph of connected filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements 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,ismindexandqt-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.