b31c9b72e5
This commit changes how levels are handled: If the level used for ebml_parse ends directly after an element that has been consumed, then ebml_parse ends the level itself (and any known-length levels that end there as well) and informs the caller via the return value; if the current level is of unknown-length, then the level is ended as soon as an element that is not valid on the current level, but on a higher level is encountered (or if EOF has been encountered). This is designed for situations where one wants to parse master elements incrementally, i.e. not in one go via ebml_parse_nest. The (incremental) parsing of clusters still mixes levels by using a syntax list that contains elements from different levels and the level is still ended manually via a call to ebml_level_end if the last cluster was an unknown-length cluster (known-length clusters are already ended when their last element is read), but only if the next element is a cluster, too. A different level 1 element following an unknown-length cluster will currently simply be presumed to be part of the earlier cluster. Fixing this will be done in a future patch. The modifications to matroska_parse_cluster contained in this patch are only intended not to cause regressions. Nevertheless, the fact that known-length levels are automatically ended in ebml_parse when their last element has been read already fixes a bogus error message introduced in 9326117b that was emitted when a known-length cluster is followed by another level 1 element other than a cluster in which case the cluster's level was not ended (which only happened when a new cluster has been encountered) so that the length check (introduced in 9326117b) failed for the level 1 element as it is of course not contained in the previous cluster. Most Matroska files were affected by this. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements 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,ismindexandqt-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.