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Anton Khirnov d85c6aba0c fftools/ffmpeg: rework audio-decode timestamp handling 
Stop using InputStream.dts for generating missing timestamps for decoded
frames, because it contains pre-decoding timestamps and there may be
arbitrary amount of delay between input packets and output frames (e.g.
dependent on the thread count when frame threading is used). It is also
in AV_TIME_BASE (i.e. microseconds), which may introduce unnecessary
rounding issues.

New code maintains a timebase that is the inverse of the LCM of all the
samplerates seen so far, and thus can accurately represent every audio
sample. This timebase is used to generate missing timestamps after
decoding.

Changes the result of the following FATE tests
* pcm_dvd-16-5.1-96000
* lavf-smjpeg
* adpcm-ima-smjpeg
In all of these the timestamps now better correspond to actual frame
durations.
2023-05-02 10:59:24 +02:00
compat compat: Use '-' instead of '/' for rc.exe options 2023-02-13 13:49:40 +02:00
doc fftools/ffmpeg: deprecate -adrift_threshold 2023-05-02 10:59:24 +02:00
ffbuild configure: probe RISC-V Vector extension 2022-09-27 13:19:52 +02:00
fftools fftools/ffmpeg: rework audio-decode timestamp handling 2023-05-02 10:59:24 +02:00
libavcodec lavf/dv: use a more granular timebase for audio 2023-05-02 10:57:21 +02:00
libavdevice avdevice/decklink_enc: fix operator precedence in create_s337_payload 2023-04-24 23:00:50 +02:00
libavfilter avfilter/af_anlms: improve documentation and extend option 2023-05-01 20:07:06 +02:00
libavformat lavf/dv: use a more granular timebase for audio 2023-05-02 10:57:21 +02:00
libavutil lavu/hwcontext_qsv: Update after adding support for VAAPI on Windows 2023-04-24 13:24:41 +08:00
libpostproc version.h: Bump minor post 6.0 branch 2023-02-19 18:37:36 +01:00
libswresample swresample/swresample: add a used channel layout option using the new API 2023-02-19 18:28:45 -03:00
libswscale version.h: Bump minor post 6.0 branch 2023-02-19 18:37:36 +01:00
presets
tests fftools/ffmpeg: rework audio-decode timestamp handling 2023-05-02 10:59:24 +02:00
tools tools/target_dec_fuzzer: Adjust threshold for rka 2023-05-01 00:48:32 +02:00
.gitattributes
.gitignore gitignore: add config_components.h 2022-03-17 18:35:41 -03:00
.mailmap mailmap: stop git lying about who I commit things as 2022-11-04 19:37:46 +01:00
.travis.yml
Changelog avfilter: add arls filter 2023-04-30 11:34:35 +02:00
configure lavu/hwcontext_vaapi: Add Windows/VAAPI support with vaGetDisplayWin32 2023-04-24 13:24:41 +08:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: add maintainer for the imf demuxer 2023-02-13 18:41:22 +01:00
Makefile tools: add an AV_CODEC_CAP_ENCODER_RECON_FRAME test tool 2023-03-28 13:00:42 +02:00
README.md
RELEASE RELEASE: update after 5.1 branch 2022-07-13 00:31:42 +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 means to alter decoded audio and video through a directed graph of connected 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.