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После попытки in-filter NPP scaling обнаружено что nppiResize не имеет _C2R variant для NV12 UV interleaved (только C1R, C3R, C4R). Alternatives: - 2× nppiResize_8u_C1R с split/merge через intermediate buffers - custom CUDA kernel - treat UV pair как 16u (blending artifact на boundaries) Pragmatic decision: cuda_grid делает только composition (same-size memcpy), а scaling делегируется существующему scale_npp filter в filter chain: [0]scale_npp=1280:1080[s0]; [1]scale_npp=640:360[s1]; ... \ [s0][s1]...cuda_grid=layout=main_plus_preview Unix philosophy + leverages production-tested NPP code. Controller (Phase 3) auto-generates filter graph с scale_npp per input. Revert: - #include <nppi.h> - libnpp dependency в configure (cuda_grid_filter_deps="ffnvcodec") - nppiResize* calls в compose path Add: - Error message с примером scale_npp chain pattern - Doc в file header c filter graph пример Phase 2 = full deliverable (2a + 2b). Дальше Phase 3 controller.
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.