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Andreas Rheinhardt 04b62bd7ce avformat/matroskadec: Improve invalid length error handling 
1. Up until now, the error message for EBML numbers whose length exceeds
the limits imposed upon them because of the element's type did not
distinguish between known-length and unknown-length elements. As a
consequence, the numerical value of the define constant
EBML_UNKNOWN_LENGTH was emitted as part of the error message which is
of course not appropriate. This commit changes this by adding error
messages designed for unknown-length elements.

2. We impose some (arbitrary) sanity checks on the lengths of certain
element types; these checks were conducted before the checks depending
on whether the element exceeds its containing master element. Now the
order has been reversed, because a failure at the (formerly) latter
check implies that the file is truly erroneous and not only fails our
arbitrary length limit. Moreover, this increases the informativeness of
the error messages.

3. Furthermore, the error message in general has been changed by replacing
the type of the element (something internal to this demuxer and
therefore suitable as debug output at best, not as an error message
intended for ordinary users) with the element ID. The element's position
has been added, too.

4. Finally, the length limit for EBML_NONE elements has been changed so
that all unknown-length elements of EBML_NONE-type trigger an error.
This is done because unknown-length elements can't be skipped and need
to be parsed, but there is no syntax to parse available for EBML_NONE
elements. This is done in preparation for a further patch which allows
more unknown-length elements than just clusters and segments.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2019-07-16 16:17:00 -03:00
compat
doc doc/codecs: Add missing documentation for nointra 2019-07-15 09:21:33 +08:00
ffbuild
fftools ffmpeg_opt: Respect default disposition when select audio/video 2019-07-03 10:33:44 +08:00
libavcodec avcodec: remove reference to AVPacket's destruct field 2019-07-15 11:20:03 -03:00
libavdevice lavd/avfoundation: Set correct default value 0 for option capture_raw_data. 2019-07-08 20:02:41 +02:00
libavfilter avfilter/vf_hysteresis: use time_base from framesync 2019-07-14 19:14:10 +02:00
libavformat avformat/matroskadec: Improve invalid length error handling 2019-07-16 16:17:00 -03:00
libavresample
libavutil avutil/hwcontext_vaapi: move kernel_driver into CONFIG_LIBDRM 2019-07-11 09:34:57 +08:00
libpostproc
libswresample
libswscale
presets
tests fate: add hls fmp4 segment type test case 2019-07-15 21:57:43 +08:00
tools tools/target_dec_fuzzer: Remove redundant av_free() 2019-07-13 14:42:57 +02:00
.gitattributes
.gitignore tools/python: add script to convert TensorFlow model (.pb) to native model (.model) 2019-07-01 10:23:47 -03:00
.travis.yml
Changelog avformat/movenc: use unspecified language by default 2019-07-12 20:26:38 +02:00
configure avutil/mips: optimize UNPCK&SAD macros with MSA2.0 instruction. 2019-07-10 12:54:57 +02:00
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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.