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Andreas Rheinhardt 4772757958 avformat/matroskaenc: Write level 1 elements in one go 
Up until now, writing level 1 elements proceeded as follows: First, the
element id was written to the ordinary output AVIOContext and a dynamic
buffer was opened for the content of the level 1 element in
start_ebml_master_crc32(). Then this buffer was actually used and after it
was closed (in end_ebml_master_crc32()), the size field corresponding to
the buffer's size was written, after which the actual data was written.

This commit changes this: Nothing is written to the main AVIOContext any
more in start_ebml_master_crc32(). end_ebml_master_crc32() now writes
both the id, the length field as well as the data. This is benefical for
streaming, because a client that receives just a Cluster ID and nothing
more might infer that this is EOF; in certain usecases there is also the
danger of a client receiving the Cluster without the actual Cluster ID
at the beginning.

Addresses #8578.

(cherry picked from commit d9c21ec)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-03-30 07:56:38 +02:00
compat
doc Update for FFmpeg 4.2.2 2019-12-31 21:19:06 +01:00
ffbuild
fftools
libavcodec cbs_mpeg2: Fix parsing the last unit 2019-12-31 16:57:37 -03:00
libavdevice
libavfilter
libavformat avformat/matroskaenc: Write level 1 elements in one go 2020-03-30 07:56:38 +02:00
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Changelog Update for FFmpeg 4.2.2 2019-12-31 21:19:06 +01:00
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RELEASE Update for FFmpeg 4.2.2 2019-12-31 21:19:06 +01:00
RELEASE_NOTES

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.