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Andreas Rheinhardt ccadd00a4a avformat/matroskaenc: Make output more deterministic 
Using random values for TrackUID and FileUID (as happens when the
AVFMT_FLAG_BITEXACT flag is not set) has the obvious downside of making
the output indeterministic. This commit mitigates this by writing the
potentially random values with a fixed size of eight byte, even if their
actual values would fit into less than eight bytes. This ensures that
even in non-bitexact mode, the differences between two files generated
with the same settings are restricted to a few bytes in the header.
(Namely the SegmentUID, the TrackUIDs (in Tracks as well as when
referencing them via TagTrackUID), the FileUIDs (in Attachments as
well as in TagAttachmentUID) as well as the CRC-32 checksums of the
Info, Tracks, Attachments and Tags level-1-elements.) Without this
patch, there might be an offset/a size difference between two such
files.

The FATE-tests had to be updated because the fixed-sized UIDs are also
used in bitexact mode.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-04-13 08:43:14 +02:00
compat compat/avisynth: remove avisynth headers 2020-04-05 01:17:55 +02:00
doc doc/filters: clarify metadata and logging for blackdetect 2020-04-13 11:23:24 +05:30
ffbuild common.mak: Also clean Windows debug files. 2020-03-21 18:46:00 +01:00
fftools fftools/ffmpeg: also flush encoders which have a variable frame size 2020-04-13 00:31:24 +02:00
libavcodec avcodec/cbs: Avoid leaving the ... out in calls to variadic macros 2020-04-12 23:23:49 +02:00
libavdevice avdevice/decklink_dec: increase autodetect timeout to 3 sec 2020-04-04 22:28:05 +02:00
libavfilter doc/filters: clarify metadata and logging for blackdetect 2020-04-13 11:23:24 +05:30
libavformat avformat/matroskaenc: Make output more deterministic 2020-04-13 08:43:14 +02:00
libavresample
libavutil lavu/mem: Make other alloc functions more similar to av_malloc(). 2020-04-12 22:32:03 +02:00
libpostproc
libswresample
libswscale swscale/yuv2rgb: Fix vertical dither offset with slices 2020-04-12 16:36:47 +02:00
presets
tests avformat/matroskaenc: Make output more deterministic 2020-04-13 08:43:14 +02:00
tools tools/target_dec_fuzzer: Adjust threshold for zerocodec 2020-04-12 16:36:47 +02:00
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.mailmap mailmap: fix 3-address entries 2020-03-31 04:14:14 -05:00
.travis.yml
Changelog Changelog: Add entry for expanded styling support in movtext 2020-04-10 09:32:13 -07:00
configure configure: add mv30 blockdsp dependency 2020-04-12 09:47:13 +10:00
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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.