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Marth64 0b342a2f15 avcodec/mpeg12dec: extract only one type of CC substream 
In MPEG-2 user data, there can be different types of Closed Captions
formats embedded (A53, SCTE-20, or DVD). The current behavior of the
CC extraction code in the MPEG-2 decoder is to not be aware of
multiple formats if multiple exist, therefore allowing one format
to overwrite the other during the extraction process since the CC
extraction shares one output buffer for the normalized bytes.

This causes sources that have two CC formats to produce flawed output.
There exist real-world samples which contain both A53 and SCTE-20 captions
in the same MPEG-2 stream, and that manifest this problem. Example of symptom:
THANK YOU (expected) --> THTHANANK K YOYOUU (actual)

The solution is to pick only the first CC substream observed with valid bytes,
and ignore the other types. Additionally, provide an option for users
to manually "force" a type in the event that this matters for a particular
source.

Signed-off-by: Marth64 <marth64@proxyid.net>
2024-03-19 15:52:05 +01:00
compat configure: Set WIN32_LEAN_AND_MEAN at configure time 2023-08-14 22:57:28 +03:00
doc doc/fate: advise on --assert-level=2 2024-03-19 04:10:48 +01:00
ffbuild makefile: Clean up missed object files with "make clean" 2024-03-10 23:45:51 +02:00
fftools fftools/ffmpeg_opt: Check before accessing union member 2024-03-17 15:10:05 +01:00
libavcodec avcodec/mpeg12dec: extract only one type of CC substream 2024-03-19 15:52:05 +01:00
libavdevice avdevice/alldevices: Mark iterators as av_cold 2024-03-17 15:10:05 +01:00
libavfilter libavfi/dnn: add LibTorch as one of DNN backend 2024-03-19 14:48:58 +08:00
libavformat avformat/matroska: use named constants for ITU-T T.35 metadata 2024-03-19 10:49:20 -03:00
libavutil lavu/hwcontext_vulkan: check PCI ID if possible 2024-03-19 09:37:39 +08:00
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/atrac: Add atrac->aea, atrac->matroska remux tests 2024-03-19 03:17:12 +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 Support PacketTypeMetadata of PacketType in enhanced flv 2024-03-18 18:38:48 +08:00
configure libavfi/dnn: add LibTorch as one of DNN backend 2024-03-19 14:48:58 +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 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.