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Andreas Rheinhardt b10a8a30db avformat/oggparsevorbis: Avoid tmp bufs when parsing VorbisComment 
A single VorbisComment consists of a length field and a
non-NUL-terminated string of the form "key=value". Up until now,
when parsing such a VorbisComment, zero-terminated duplicates of
key and value would be created. This is wasteful if these duplicates
are freed shortly afterwards, as happens in particular in case of
attached pictures: In this case value is base64 encoded and only
needed to decode the actual data.

Therefore this commit changes this: The buffer is temporarily modified
so that both key and value are zero-terminated. Then the data is used
in-place and restored to its original state afterwards.

This requires that the buffer has at least one byte of padding. All
buffers currently have AV_INPUT_BUFFER_PADDING_SIZE bytes padding,
so this is ok.

Finally, this also fixes weird behaviour from ogm_chapter():
It sometimes freed given to it, leaving the caller with dangling
pointers.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-08-28 15:25:18 +02:00
compat compat/cuda: add __expf() implementation 2021-08-14 15:06:47 +02:00
doc doc/filters.texi: Include dnn_processing in docs of sr and derain filter 2021-08-28 16:19:07 +08:00
ffbuild avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
fftools fftools/ffmpeg_filter: silence valgrind warning 2021-08-25 22:51:32 +02:00
libavcodec h274: remove optimization pragma 2021-08-28 15:13:55 +02:00
libavdevice avdevice/decklink: support for more duplex mode for Decklink 8K Pro 2021-08-16 10:00:39 +08:00
libavfilter lavfi/dnn: Rename InferenceItem to LastLevelTaskItem 2021-08-28 16:19:07 +08:00
libavformat avformat/oggparsevorbis: Avoid tmp bufs when parsing VorbisComment 2021-08-28 15:25:18 +02:00
libavutil avutil/log: Reorder elements of AVClass to make it smaller 2021-08-25 23:01:53 +02:00
libpostproc postproc/postprocess: Remove legacy cruft 2021-07-29 22:02:06 +02:00
libswresample (postproc|swresample)/version: Don't include libavutil/avutil.h 2021-07-29 22:02:05 +02:00
libswscale avutil/internal, swresample/audioconvert: Remove cpu.h inclusions 2021-07-22 14:33:45 +02:00
presets
tests avfilter/aeval: fix forgotten EOF case for activate 2021-08-26 19:23:03 +02:00
tools tools/dvd2concat: use option keyword 2021-08-22 11:44:17 +02:00
.gitattributes
.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
Changelog avfilter: add hsvkey and hsvhold video filters 2021-08-25 20:43:18 +02:00
configure avfilter/vf_convolve: switch to TX FFT from avutil 2021-08-17 09:15:06 +02:00
CONTRIBUTING.md
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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
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 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.