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Andreas Rheinhardt 9b0f9003df avformat/matroskaenc: Make ebml_num_size() more robust 
Matroska (or actually EBML) uses variable-length numbers where only
seven bits of every byte is usable for the length; the other bits encode
the length of the variable-length number. So in order to find out how
many bytes one needs to encode a given number one can use a loop like
while (num >> 7 * bytes) bytes++; the Matroska muxer effectively did this.

Yet it has a disadvantage: It is impossible for the result of a single
right shift of an unsigned number with most significant bit set to be
zero, because one can only shift by 0..(width - 1). On some
architectures like x64 it is not even possible to do it with undefined
right shifts in which case this leads to an infinite loop.

This can be easily avoided by switching to a loop whose condition is
(num >>= 7). The maximum value the so modified function can return
is 10; any value > 8 is invalid and will now lead to an assert in
put_ebml_num() or in start_ebml_master() (or actually in
put_ebml_size_unknown()).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-04-20 21:30:46 +02:00
compat compat/avisynth: remove avisynth headers 2020-04-05 01:17:55 +02:00
doc avformat/dashenc: add a PlaybackRate element 2020-04-20 13:49:15 -03:00
ffbuild common.mak: Also clean Windows debug files. 2020-03-21 18:46:00 +01:00
fftools cmdutils: stop using deprecated av_codec_next() 2020-04-20 14:50:03 +00:00
libavcodec avcodec/pngdec: Pass ret from decode_iccp_chunk() 2020-04-20 20:38:41 +02:00
libavdevice avdevice/opengl: add support of wrapped avframe codec 2020-04-16 23:52:12 +02:00
libavfilter avfilter: add maskedthreshold filter 2020-04-18 12:34:49 +02:00
libavformat avformat/matroskaenc: Make ebml_num_size() more robust 2020-04-20 21:30:46 +02:00
libavresample avresample: remove deprecated attribute from the AVAudioResampleContext struct 2018-01-09 10:56:53 -03:00
libavutil avutil/log: update text requesting samples 2020-04-17 00:08:56 +02:00
libpostproc libavcodec, libpostproc: Remove outcommented START/STOP_TIMER 2020-03-14 18:24:04 +01:00
libswresample Silence "string-plus-int" warning shown by clang. 2020-01-06 22:38:56 +01:00
libswscale swscale: aarch64: Avoid using the x18 register 2020-04-20 00:09:34 +03:00
presets
tests fate/truehd: add a test for the truehd_core bitstream filter 2020-04-20 13:53:42 -03:00
tools tools: stop using deprecated av_codec_next() 2020-04-20 15:08:20 +00:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore tools/python: add script to convert TensorFlow model (.pb) to native model (.model) 2019-07-01 10:23:47 -03:00
.mailmap mailmap: fix 3-address entries 2020-03-31 04:14:14 -05:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog avfilter: add maskedthreshold filter 2020-04-18 12:34:49 +02:00
configure configure: add MLP parser as dependency to MLP and TrueHD demuxers 2020-04-19 15:58:45 -03:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
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 my gpg fingerprint 2020-03-23 23:37:19 +01:00
Makefile Makefile: Delete more created files when running "make distclean". 2020-03-11 11:43:01 +01:00
README.md Remove the ffserver program 2018-01-06 18:31:37 +00:00
RELEASE RELEASE: Update value for post 4.2 branch 2019-07-21 18:37:32 +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 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.