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wm4 7e240f9581 matroskadec: verify seekhead IDs 
Some files have SeekHead elements with broken IDs. They mismatch with
the ID of the destination element. These files are written by
"IDMmkvlib0.1" (as identified by the MuxingApp and WritingApp elements),
and the SeekHead IDs are actually endian-swapped.

This confuses the SeekHead logic of the demuxer. It will read some
elements twice, because the SeekHead ID is used to identify and remember
already read elements. With the file at hand, the stream list was
duplicated by reading the Tracks element twice.

Fix this by rejecting invalid EBML IDs in SeekHead entries. (This fix is
relatively specific to the broken file at hand, and doesn't protect
against some other cases of broken SeekHead, such as valid but
mismatching target element IDs.)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-12 19:30:11 +02:00
compat
doc doc/ffmpeg: remove tips 2015-06-10 13:08:48 -08:00
libavcodec avcodec/jpeg2000dec: Reduce verbosity of get_plt() 2015-06-12 16:48:57 +02:00
libavdevice avdevice/openal-dec: Make al_format_info const 2015-06-11 00:48:41 +02:00
libavfilter avfilter/vf_zoompan: support planar rgb pixel formats 2015-06-12 17:15:20 +00:00
libavformat matroskadec: verify seekhead IDs 2015-06-12 19:30:11 +02:00
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libavutil avcodec/mips: MSA (MIPS-SIMD-Arch) optimizations for AVC idct functions 2015-06-11 17:10:45 +02:00
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libswscale Mark vectors as NAN instead of dereferencing NULL pointers on malloc failure 2015-06-12 15:06:32 +02:00
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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.
  • ffserver is a multimedia streaming server for live broadcasts.
  • 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.