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Andreas Rheinhardt 0788a74876 avcodec/jpeglsenc: Don't modify frame we don't own 
The jpegls encoder uses three buffers (as well as its state) to perform
its function: A copy of the last encoded line as a decoder would decode it,
the part of the current line that has been encoded (again, as a decoder
would decode it) and the part of the current line that is not yet encoded.

The encoder solves this by modifying the input frame as it encodes the
output (it also zero-allocates a line to serve as last line for the
first line where no preceding line exists); yet this is wrong as said
frame is not owned by the encoder, so it must not be modified (and it is
given to the encoder as const AVFrame *) without making it writable.

This patch solves this bug by allocating two lines, one for the last and
one for the currently encoded line of output (as a decoder would decode it).

Notice that the frame is only modified if the encoder is in the
non-default non-lossless mode.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
 		2021-03-08 03:33:27 +01:00
compat compat/cuda: correct ushort4 to use ushort 2021-02-22 17:03:52 +01:00
doc doc/muxers.texi: Readd documentation removed accidentally 2021-03-07 01:25:32 +01:00
ffbuild ffbuild/common: Make deletion of templates possible 2021-02-07 09:45:04 +01:00
fftools ffprobe: switch to av_bprint_escape for XML escaping 2021-03-05 19:45:00 +02:00
libavcodec avcodec/jpeglsenc: Don't modify frame we don't own 2021-03-08 03:33:27 +01:00
libavdevice Remove double ';' 2021-03-01 06:10:44 +01:00
libavfilter avfilter/buffersink: Postpone removal of av_[a]buffersink_params_alloc 2021-03-07 15:19:10 +01:00
libavformat avformat/dashdec: Don't needlessly strdup metadata 2021-03-08 02:25:52 +01:00
libavresample
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libavutil avutil/{avstring,bprint}: add XML escaping from ffprobe to avutil 2021-03-05 19:45:00 +02:00
libpostproc lavu/mem: move the DECLARE_ALIGNED macro family to mem_internal on next+1 bump 2021-01-01 14:14:57 +01:00
libswresample swresample/audioconvert: Fix left shift of negative value 2020-09-30 10:50:45 +02:00
libswscale swscale/x86/swscale: Remove unused ASM constants 2021-02-24 09:47:54 +01:00
presets
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tests avformat: add TTML muxer 2021-03-05 19:45:00 +02:00
tools avutil/{avstring,bprint}: add XML escaping from ffprobe to avutil 2021-03-05 19:45:00 +02:00
.gitattributes
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.gitignore
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.mailmap mailmap: add entry for myself 2020-07-13 11:24:04 +08:00
.travis.yml
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CONTRIBUTING.md
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COPYING.GPLv2
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COPYING.GPLv3
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COPYING.LGPLv2.1
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COPYING.LGPLv3
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CREDITS
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Changelog avfilter: add msad video filter 2021-03-06 12:42:16 +01:00
INSTALL.md
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LICENSE.md
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MAINTAINERS MAINTAINERS: update names 2021-01-20 01:04:26 -06:00
Makefile tools/enum_options: fix build and add to Makefile 2020-11-20 15:20:24 +01:00
README.md
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RELEASE RELEASE: We are after the 4.3 branch point, update for that 2020-06-10 00:20:24 +02:00
configure Handle AVID MJPEG streams directly in the MJPEG decoder. 2021-02-25 11:46:28 +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.