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Gyan Doshi 1c23abc88f avutil/eval: add function to track variable use 
1)Some filters allow cross-referenced expressions e.g. x=y+10. In
such cases, filters evaluate expressions multiple times for
successful evaluation of all expressions. If the expression for one or
more variables contains a RNG, the result may vary across evaluation
leading to inconsistent values across the cross-referenced expressions.

2)A related case is circular expressions e.g. x=y+10 and y=x+10 which
cannot be succesfully resolved.

3)Certain filter variables may only be applicable in specific eval modes
and lead to a failure of evaluation in other modes e.g. pts is only
relevant for frame eval mode.

At present, there is no reliable means to identify these occurrences and
thus the error messages provided are broad or inaccurate. The helper
function introduced - av_expr_count_vars - allows developers to identify
the use and count of variables in expressions and thus tailor the error
message, allow for a graceful fallback and/or decide evaluation order.
2019-11-17 11:07:05 +05:30
compat compat/cuda: Change inclusion guards 2019-08-05 12:07:09 +02:00
doc avfilter/vf_colorbalance: add support for commands 2019-11-13 13:07:42 +01:00
ffbuild build: add support for building CUDA files with clang 2019-08-04 19:08:08 +02:00
fftools fftools/ffmpeg_opt: Fix mixed declarations and code 2019-11-06 20:38:03 +01:00
libavcodec avcodec/nvenc: make sure newly allocated packets are refcounted 2019-11-17 01:37:34 +01:00
libavdevice avdevice/v4l2: Remove av_assert0 when format not supported 2019-11-06 20:38:03 +01:00
libavfilter avfilter/vf_framepack: really fix ef466a8b29 2019-11-17 00:23:03 +01:00
libavformat lavf/rtmpproto: fix the playpath truncation if the len > 512 2019-11-17 09:09:38 +08:00
libavresample
libavutil avutil/eval: add function to track variable use 2019-11-17 11:07:05 +05:30
libpostproc Bump minor versions again on master to keep 4.2 versions separate from master 2019-07-21 18:36:31 +02:00
libswresample swresample/audioconvert: fix invalid left shift for 64bit sample format 2019-09-26 16:22:47 +02:00
libswscale swscale/swscale_unscaled: fix gbrap10be md5 different on big endian system 2019-11-01 14:43:16 +01:00
presets
tests tests/ref/vsynth: add missing reference files, fix build 2019-11-13 23:34:56 +01:00
tools tools/target_dec_fuzzer: Adjust threshold for smacker 2019-11-09 15:23:06 +01:00
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.gitignore tools/python: add script to convert TensorFlow model (.pb) to native model (.model) 2019-07-01 10:23:47 -03:00
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Changelog avformat: add an AV1 Annex B demuxer 2019-11-12 22:21:51 -03:00
configure avformat: add an AV1 Annex B demuxer 2019-11-12 22:21:51 -03:00
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README.md
RELEASE RELEASE: Update value for post 4.2 branch 2019-07-21 18:37:32 +02:00

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

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements 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, ismindex and qt-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.