mirror of https://git.ffmpeg.org/ffmpeg.git
a9709b3c83
Up until now, ff_mpv_frame_start() offsets the data of the current picture and doubles the linesizes of all pictures if the current picture is field-based so that data and linesize allow to address the current field only. This is done based upon the current picture_structure value. Only two mpegvideo-based decoders ever set this field: mpeg1/2 and VC-1; but the latter only does it after ff_mpv_frame_start() (when using hardware-acceleration and in order to signal it to the DXVA2 hwaccel) in which case no offset is applied in ff_mpv_frame_start(). So only one decoder actually wants this offset*; therefore move the code performing it to mpeg12dec.c. *: VC-1 doubles linesize when using field_mode (not only the picture's linesize, but also uvlinesize and linesize), yet it does not offset anything. This is further proof that this should not be performed generically. Also move MPEG-1/2 specific setting of the top-field-first flag. (The change here implies that the AVFrame in current_picture may have different top-field-first flags than the AVFrame from current_picture_ptr, but this doesn't matter as only the latter's are used.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com> |
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| compat | ||
| doc | ||
| ffbuild | ||
| fftools | ||
| libavcodec | ||
| libavdevice | ||
| libavfilter | ||
| libavformat | ||
| libavutil | ||
| libpostproc | ||
| libswresample | ||
| libswscale | ||
| presets | ||
| tests | ||
| tools | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| CONTRIBUTING.md | ||
| COPYING.GPLv2 | ||
| COPYING.GPLv3 | ||
| COPYING.LGPLv2.1 | ||
| COPYING.LGPLv3 | ||
| CREDITS | ||
| Changelog | ||
| INSTALL.md | ||
| LICENSE.md | ||
| MAINTAINERS | ||
| Makefile | ||
| README.md | ||
| RELEASE | ||
| configure | ||
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
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.