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This option adds a long string of numbers to the progress line, where i-th number contains the base-2 logarithm of the number of times a frame with this QP value was seen by print_report(). There are multiple problems with this feature: * despite this existing since 2005, web search shows no indication that it was ever useful for any meaningful purpose; * the format of what is printed is entirely undocumented, one has to find it out from the source code; * QP values above 31 are silently ignored; * it only works with one video stream; * as it relies on global state, it is in conflict with ongoing architectural changes. It then seems that the nontrivial cost of maintaining this option is not worth its negligible (or possibly negative - since it pollutes the already large option space) value. Users who really need similar functionality can also implement it themselves using -vstats.
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.