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Andreas Rheinhardt f249c32eff avcodec/jpeglsenc: Avoid intermediate buffer, allow user-supplied buffers 
Up until now, the JPEG-LS encoder allocated a worst-case-sized packet
at the beginning of each encode2 call; then it wrote the packet header
into its destination buffer and encoded the actual packet data;
said data is written into another worst-case-sized buffer, because it
needs to be escaped before being written into the packet buffer.
Finally, because the packet buffer is worst-case-sized, the generic
code copies the actually used part into a fresh buffer.

This commit changes this: Allocating the packet and writing the header
into it is deferred until the actual data has been encoded and its size
is known. This gives a good upper bound for the needed size of the packet
buffer (the upper bound might be 1/15 too large) and so one can avoid the
implicit intermediate buffer and support user-supplied buffers by using
ff_get_encode_buffer().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-05-15 11:56:35 +02:00
compat fix broken links to msdn documentation 2021-05-13 09:13:03 +10:00
doc doc/filters: Unhedge note for sub option in guided filter 2021-05-14 15:39:47 +05:30
ffbuild libavresample: Remove deprecated library 2021-04-27 10:43:13 -03:00
fftools ffmpeg: return no chosen output if an uninitialized stream is unavailable 2021-05-13 17:59:35 +03:00
libavcodec avcodec/jpeglsenc: Avoid intermediate buffer, allow user-supplied buffers 2021-05-15 11:56:35 +02:00
libavdevice avformat: move AVStream.{parser,need_parsing} to AVStreamInternal 2021-05-07 09:27:21 -03:00
libavfilter avfilter/guided: reindent after 93ddb9b617 2021-05-14 15:37:45 +05:30
libavformat Revert "avformat/hlsenc: compute video_keyframe_size after write keyframe" 2021-05-15 15:27:58 +08:00
libavutil avutil/imgutils: don't add offsets to NULL pointers 2021-05-12 15:52:50 -03:00
libpostproc Bump major versions of all libraries. 2021-04-27 11:48:05 -03:00
libswresample Bump major versions of all libraries. 2021-04-27 11:48:05 -03:00
libswscale Bump major versions of all libraries. 2021-04-27 11:48:05 -03:00
presets
tests fate: add a more extensive test for APNG_DISPOSE_OP_BACKGROUND 2021-05-14 11:15:13 +02:00
tools tools/target_dec_fuzzer: Adjust threshold for TAK 2021-05-12 23:00:07 +02:00
.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 entry for myself 2021-03-09 02:09:55 +00:00
.travis.yml Merge commit '899ee03088d55152a48830df0899887f055da1de' 2019-03-14 15:53:16 -03:00
Changelog avformat: add Argonaut Games CVG muxer 2021-05-12 20:27:02 +10:00
configure configure: fix some filter dependencies 2021-05-09 10:17:49 +02:00
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 avformat: add Argonaut Games CVG demuxer 2021-05-12 20:25:50 +10:00
Makefile libavresample: Remove deprecated library 2021-04-27 10:43:13 -03:00
README.md Remove the ffserver program 2018-01-06 18:31:37 +00:00
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.