gx
d7fd75657d
New AVOption aspect_mode (0=stretch default, 1=fit). При fit вычисляется
inscribed rect внутри cell сохраняющий src aspect ratio. Letterbox/pillarbox
заполняется BT.709 limited-range black (Y=16, UV=128,128) через existing
Alpha_Fill_Y/UV kernels с alpha=255.
Fixes user complaint: main_plus_preview main cell {0,0,2/3,1.0} = 1.18:1 →
camera 16:9 stretched по высоте. С aspect_mode=1 camera fits ширину 853×479
с letterbox 120px сверху+снизу.
Verified: main_plus_preview snapshot — parking lot now proportional, не
deformed; preview cells (16:9) — perfect fit camera (16:9) без bars.
Cost: 2 extra kernel launches (Alpha_Fill Y+UV) per cell когда aspect_mode=1
и aspect mismatch. ~negligible vs resize.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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.