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softworkz 20e8be0c20 avformat/matroskaenc: Regression fix for invalid MKV headers The following three commits created a regression by writing initially invalid mkv headers: `650e17d88b` avformat/matroskaenc: write a CRC32 element on Tags `3bcadf8227` avformat/matroskaenc: write a CRC32 element on Info `ee888cfbe7` avformat/matroskaenc: postpone writing the Tracks master Symptoms: - You can no longer playback a file that is still processed by ffmpeg, e.g. VLC fails playback - You can no longer stream a file to a client while if is still being processed - Various diagnosing tools show header errors or incomplete headers (e.g. ffprobe, mediainfo, mkvalidator) Note: The symptoms do not apply to completed files or ffmpeg runs that were interrupted with 'q' Cause: The mentioned commits made changes in a way that some header elements are only partially written in mkv_write_header, leaving the header in an invalid state. Only in mkv_write_trailer, these elements are finished correctly, but that does only occur at the end of the process. Regression: Before these commits were applied, mkv headers have always been valid, even before completion of ffmpeg. This has worked reliably over many versions of ffmpeg, to it was an obvious regression. Bugtracker: This issue has been recorded as #5977 which is resolved by this patch Patch: The patch adds a new function 'end_ebml_master_crc32_preliminary' that preliminarily finishes the ebml element without destroying the buffer. The buffer can be used to update the ebml element later during mkv_write_trailer. But most important: mkv_write_header finishes with a valid mkv header again. Signed-off-by: James Almer <jamrial@gmail.com>		2017-01-07 11:20:36 -03:00
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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.

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.