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When vobsub_read_packet() reads a packet, it uses a dedicated AVPacket to get the subtitle timing and position from an FFDemuxSubtitlesQueue (which has been filled with this data during reading the idx file in vobsub_read_header); afterwards the actual subtitle data is read into the packet destined for output and the timing and position are copied to this packet. Afterwards, the local packet is unreferenced. This can be simplified: Simply use the output packet to get the timing and position from the FFDemuxSubtitlesQueue. The packet's size will be zero afterwards, so that it can be directly used to read the actual subtitle data. This makes copying the packet fields as well as unreferencing the local packet unecessary and also removes an instance of usage of sizeof(AVPacket) in libavformat. The only difference is that the returned packet will already be flagged as a keyframe. This currently only happens in compute_pkt_fields(). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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.