avformat/matroskaenc: Don't use size of inexistent Cluster

In order to determine whether the current Cluster needs to be closed
because of the limits on clustersize and clustertime,
mkv_write_packet() would first get the size of the current Cluster by
applying avio_tell() on the dynamic buffer holding the current Cluster.
It did this without checking whether there is a dynamic buffer for
writing Clusters open right now.

In this case (which happens when writing the first packet)
avio_tell() returned AVERROR(EINVAL); yet it is not good to rely on
avio_tell() (or actually, avio_seek()) to handle the situation
gracefully.

Fixing this is easy: Only check whether a Cluster needs to be closed
if a Cluster is in fact open.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
1 file changed
tree: 0cdd80b2d9d2da454838fcbfeb172aa39bbd230b
  1. compat/
  2. doc/
  3. ffbuild/
  4. fftools/
  5. libavcodec/
  6. libavdevice/
  7. libavfilter/
  8. libavformat/
  9. libavresample/
  10. libavutil/
  11. libpostproc/
  12. libswresample/
  13. libswscale/
  14. presets/
  15. tests/
  16. tools/
  17. .gitattributes
  18. .gitignore
  19. .mailmap
  20. .travis.yml
  21. Changelog
  22. configure
  23. CONTRIBUTING.md
  24. COPYING.GPLv2
  25. COPYING.GPLv3
  26. COPYING.LGPLv2.1
  27. COPYING.LGPLv3
  28. CREDITS
  29. INSTALL.md
  30. LICENSE.md
  31. MAINTAINERS
  32. Makefile
  33. README.md
  34. RELEASE
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.