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Andreas Rheinhardt 824f750880 h264_mp4toannexb: Improve overread checks 
1. Left shifts of signed values are undefined as soon as the result is
no longer representable in the target type. Therefore make nal_size
an uint32_t and drop the check for whether it is < 0.
2. The two checks for overreads (whether the length field is contained
in the packet and whether the actual unit is contained in the packet)
can be combined into one because the packet is padded, i.e. a potential
overread caused by reading the length field without checking whether
said length field is actually part of the packet's buffer is allowed
as one always stays within the padding. But one has to be aware of
a pitfall: The comparison must be performed in (at least) int64_t as
otherwise buf_end - buf might be promoted to uint32_t in which case
an already occured overread would appear as a very large number.
A comment explaining this has been added, too.
3. Units of size zero are now silently dropped; the earlier code would
instead read the first byte of the next length field (or the first byte
of padding) to infer the type of the current unit.
4. Futhermore, the earlier code returned the wrong error code. This has
been fixed, too.

Fixes #8290.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2020-03-06 00:58:31 +01:00
compat compat/os2threads: define INCL_DOSERRORS 2020-02-15 18:25:51 +01:00
doc doc/filters: add missed framesync part in filter docs 2020-03-05 14:09:10 +08:00
ffbuild build: add support for building CUDA files with clang 2019-08-04 19:08:08 +02:00
fftools ffmpeg: remove superfluous custom cuvid hwaccel 2020-03-03 18:11:28 -03:00
libavcodec h264_mp4toannexb: Improve overread checks 2020-03-06 00:58:31 +01:00
libavdevice avdevice/decklink: add support for SDK version 11.5 2020-02-26 21:32:56 +01:00
libavfilter avfilter/f_sendcmd: implement expr flag 2020-03-03 20:38:56 +01:00
libavformat lavf/dashdec: add 3GPP TS26.247 probe in dash demuxer 2020-03-05 14:15:41 +08:00
libavresample avresample: remove deprecated attribute from the AVAudioResampleContext struct 2018-01-09 10:56:53 -03:00
libavutil hwcontext_vaapi: Only accept a render node when deriving from DRM device 2020-02-24 00:09:51 +00:00
libpostproc Silence "string-plus-int" warning shown by clang. 2020-01-06 22:38:56 +01:00
libswresample Silence "string-plus-int" warning shown by clang. 2020-01-06 22:38:56 +01:00
libswscale libswscale/x86/yuv2rgb: Fix Segmentation Fault when load unaligned data 2020-02-26 11:10:46 +01:00
presets
tests h264_mp4toannexb: Try to avoid four byte startcodes 2020-03-06 00:58:31 +01:00
tools tools/target_dec_fuzzer: limit per frame samples for APE 2020-01-30 19:59:10 +01:00
.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: Add another old mail address I used. 2020-02-27 13:02:06 +01:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog avfilter: add Contrast Adaptive Sharpen video filter 2020-02-24 11:57:25 +01:00
configure configure: Enable section_data_rel_ro for OpenBSD aarch64 / arm 2020-02-25 19:57:16 +01:00
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 myself as libzmq maintainer 2020-02-15 18:25:51 +01:00
Makefile tools: add a fuzzer tool for bitstream filters 2019-12-05 20:49:15 -03:00
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.