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Marton Balint 5df901ffa5 avutil/timestamp: introduce av_ts_make_time_string2 for better precision 
av_ts_make_time_string() used "%.6g" format, but this format was losing
precision even when the timestamp to be printed was not that large. For example
for 3 hours (10800) seconds, only 1 decimal digit was printed, which made this
format inaccurate when it was used in e.g. the silencedetect filter. Other
detection filters printing timestamps had similar issues. Also time base
parameter of the function was *AVRational instead of AVRational.

Resolve these problems by introducing a new function, av_ts_make_time_string2().

We change the used format to "%.*f", use a precision of 6, except when printing
values near 0, in which case we calculate the precision dynamically to aim for
a similar precision in normal form as with %.6g.  No longer using scientific
representation can make parsing the timestamp easier for the users, we can
safely do this because the theoretical maximum of INT64_MAX*INT32_MAX still
fits into the string buffer in normal form.

We somewhat imitate %g by trimming ending zeroes and the potential decimal
point characters. In order not to trim "inf" as well, we assume that the
decimal point string does not contain the letter "f". Note that depending on
printf %f implementation, we might trim "infinity" to "inf".

Thanks for Allan Cady for bringing up this issue.

Signed-off-by: Marton Balint <cus@passwd.hu>
2024-03-25 21:30:51 +01:00
compat configure: Set WIN32_LEAN_AND_MEAN at configure time 2023-08-14 22:57:28 +03:00
doc avutil/timestamp: introduce av_ts_make_time_string2 for better precision 2024-03-25 21:30:51 +01:00
ffbuild makefile: Clean up missed object files with "make clean" 2024-03-10 23:45:51 +02:00
fftools ffprobe: adapt to new AVFilmGrainParams 2024-03-23 18:54:36 +01:00
libavcodec avcodec/x86/h264_idct: Fix incorrect xmm spilling on win64 2024-03-25 21:17:47 +01:00
libavdevice avformat/mux: Rename FF_FMT_ALLOW_FLUSH->FF_OFMT_FLAG_ALLOW_FLUSH 2024-03-22 23:57:19 +01:00
libavfilter avfilter/af_channelmap: add some additional checks for the mappings 2024-03-24 21:27:55 +01:00
libavformat avformat/mov_chan: Use anonymous enum 2024-03-25 17:40:19 +01:00
libavutil avutil/timestamp: introduce av_ts_make_time_string2 for better precision 2024-03-25 21:30:51 +01:00
libpostproc libs: bump major version for all libraries 2024-03-07 11:29:43 -03:00
libswresample libs: bump major version for all libraries 2024-03-07 11:29:43 -03:00
libswscale avutil/x86util: Fix broken pre-SSE4.1 PMINSD emulation 2024-03-17 13:52:27 +01:00
presets
tests fate/source: Fix FATE reference file 2024-03-25 15:18:37 +01:00
tools tools/target_dec_fuzzer: adjust threshold for AV_CODEC_ID_IFF_ILBM 2024-03-19 04:10:48 +01:00
.gitattributes lavf/assenc: normalize line endings to \n 2024-02-11 17:01:07 -08:00
.gitignore gitignore: add config_components.h 2022-03-17 18:35:41 -03:00
.mailmap .mailmap: Update my mailmap entry 2024-02-23 00:17:21 +01:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog Changelog: add dnn libtorch backend entry 2024-03-23 11:42:13 +01:00
configure vulkan_av1: port to the new stable API 2024-03-25 08:54:40 +01:00
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 INSTALL.md: Fix Markdown formatting 2019-01-31 10:29:16 -09:00
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS MAINTAINERS: add myself as dvdvideo demuxer, rcwt muxer maintainer 2024-03-10 15:21:23 +01:00
Makefile tools: Add target_sws_fuzzer.c 2024-02-21 18:24:17 +01:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
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.