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Andreas Rheinhardt cc1251ab81 avcodec/movtextdec: Sanitize style entries 
There are three types of style entries which are redundant:
a) Entries with length zero. They are already discarded.
b) Entries that are equivalent to the default style:
They can be safely discarded.
c) Entries that are equivalent to the immediately preceding style
if the start of the current style coincides with the end of the
preceding style. In this case the styles can be merged.

This commit implements discarding/merging in cases b) and c).
This fixes ticket #9548. In said ticket each packet contained
exactly one style entry that covered the complete packet with
the exception of the last character (probably created by a tool
that didn't know that the style's end is exclusive). Said style
coincided with the default style, leading to a superfluous reset,
which is now gone.

Reviewed-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-12-08 21:00:52 +01:00
compat Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
doc ffmpeg: deprecate passing numbers to -vsync 2021-12-07 11:23:45 +01:00
ffbuild avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
fftools ffmpeg: handle errors in print_sdp() 2021-12-07 11:23:45 +01:00
libavcodec avcodec/movtextdec: Sanitize style entries 2021-12-08 21:00:52 +01:00
libavdevice lavd/v4l2: detect device name truncation 2021-12-07 11:16:14 +01:00
libavfilter lavfi/vf_subtitles: stop using deprecated ass_set_aspect_ratio() 2021-12-07 11:16:14 +01:00
libavformat avformat/mov: Simplify data->hex conversion 2021-12-08 14:17:39 +01:00
libavutil avutil/aes_ctr: Avoid allocation of AVAES struct 2021-12-08 14:14:00 +01:00
libpostproc libpostproc/postprocess_template: Don't reimplement FFSWAP 2021-10-02 17:13:42 +02:00
libswresample all: Remove unused-but-set variables 2021-12-03 16:09:14 +01:00
libswscale swscale/yuv2rgb: Silence a set-but-unused-variable warning 2021-12-03 16:10:51 +01:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests FATE: stop using numeric arguments to -vsync 2021-12-07 11:23:45 +01:00
tools tools/target_dec_fuzzer: Adjust threshold for HQ_HQA 2021-12-06 14:25:55 +01:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
.mailmap mailmap: add entry for myself 2021-03-09 02:09:55 +00:00
.travis.yml Merge commit '899ee03088d55152a48830df0899887f055da1de' 2019-03-14 15:53:16 -03:00
Changelog Changelog: update with recent Vulkan filter additions 2021-12-02 11:08:58 +01:00
configure lavfi/vf_subtitles: stop using deprecated ass_set_aspect_ratio() 2021-12-07 11:16:14 +01:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1 cosmetics: Delete empty lines at end of file. 2012-02-09 12:26:45 +01:00
COPYING.LGPLv3
CREDITS CREDITS: redirect to Git log, remove current outdated content 2013-01-31 18:02:52 +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 avformat: add Argonaut Games CVG demuxer 2021-05-12 20:25:50 +10:00
Makefile FATE: add a test for sliced scaling 2021-08-08 19:26:05 +02:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE Bump Versions before release/4.4 branch 2021-03-20 01:01:12 +01:00

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.