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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
compat compat/atomics: rename header guards 2016-12-02 20:08:54 -03:00
doc libavformat/avio: Add avio_get_dyn_buf function 2017-01-07 13:04:05 +01:00
libavcodec avcodec: add QDMC decoder 2017-01-06 22:05:45 +01:00
libavdevice avdevice/decklink_enc: do not reference this after freeing it 2016-12-27 01:11:59 +01:00
libavfilter lavfi/selectivecolor: add a link to algorithm explanations 2017-01-07 14:25:57 +01:00
libavformat avformat/matroskaenc: Regression fix for invalid MKV headers 2017-01-07 11:20:36 -03:00
libavresample Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libavutil avutil/tests: added selftest for aes_ctr.c 2017-01-02 02:45:43 +01:00
libpostproc Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libswresample swresample/resample: remove swri_resample function 2016-12-14 06:48:34 +07:00
libswscale swscale/swscale: Fix dereference of stride array before null check 2016-12-23 21:47:47 +01:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests avutil/tests: added selftest for aes_ctr.c 2017-01-02 02:45:43 +01:00
tools tools/zmqsend: Do not truncate fgetc() return 2016-12-24 14:46:25 +01:00
.gitattributes Treat all '*.pnm' files as non-text file 2014-11-28 17:52:43 -05:00
.gitignore Merge commit '6641819feedb086ebba3d2be89b8d33980f367e1' 2016-06-26 15:43:05 +02:00
.travis.yml Merge commit 'eda183287489b2c705843aa373a19c4e46fb2fec' 2015-11-22 17:12:24 +00:00
arch.mak mips: rename mipsdspr1 to mipsdsp 2015-12-04 02:35:42 +01:00
Changelog avcodec: add QDMC decoder 2017-01-06 22:05:45 +01:00
cmdutils_common_opts.h cmdutils: add show_demuxers and show_muxers 2016-11-08 01:56:31 +01:00
cmdutils_opencl.c all: use FFDIFFSIGN to resolve possible undefined behavior in comparators 2015-11-03 16:28:30 -05:00
cmdutils.c cmdutils: remove duplicate windows.h include 2016-11-16 15:06:16 +01:00
cmdutils.h cmdutils: add show_demuxers and show_muxers 2016-11-08 01:56:31 +01:00
common.mak Merge commit 'c5fd4b50610f62cbb3baa4f4108139363128dea1' 2016-06-27 19:39:46 +02:00
configure configure: Fix standalone compilation of the ljpeg encoder. 2017-01-05 11:44:04 +01:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1 cosmetics: Delete empty lines at end of file. 2012-02-09 12:26:45 +01:00
COPYING.LGPLv3
CREDITS CREDITS: redirect to Git log, remove current outdated content 2013-01-31 18:02:52 +01:00
ffmpeg_cuvid.c doc: fix spelling errors 2016-10-21 23:58:47 +02:00
ffmpeg_dxva2.c Merge commit '18c506e9e6e8df8b1d496d093077b8240ea68c28' 2016-06-26 15:34:01 +02:00
ffmpeg_filter.c ffmpeg_filter: fix several logic failures 2016-11-24 16:27:55 +01:00
ffmpeg_opt.c Avoid using the term "file" and prefer "url" in some docs and comments 2016-12-05 21:30:12 +01:00
ffmpeg_qsv.c ffmpeg_qsv: Fix hwaccel transcoding 2016-11-13 17:49:48 +00:00
ffmpeg_vaapi.c ffmpeg_vaapi: fix choice of decoder_format 2016-09-29 01:23:52 +02:00
ffmpeg_vdpau.c Merge commit 'f72db3f2f3a8c83a4f5dede8fa03434b2bf676c6' 2016-06-26 15:29:39 +02:00
ffmpeg_videotoolbox.c ffmpeg/videotoolbox: protect UTGetOSTypeFromString on both VDA and VT 2015-10-15 10:22:31 +02:00
ffmpeg.c ffmpeg: remove stop_encoding variable and related code, it is dead / unused code 2016-12-28 19:19:15 +01:00
ffmpeg.h Merge commit '50722b4f0cbc5940e9e6e21d113888436cc89ff5' 2016-11-13 15:33:39 +01:00
ffplay.c ffplay: add startup volume option 2016-12-25 12:51:21 -08:00
ffprobe.c lavc: Add spherical packet side data API 2016-12-07 14:40:06 -05:00
ffserver_config.c ffserver_config: Check for failure to allocate FFServerIPAddressACL 2016-12-22 19:23:08 +01:00
ffserver_config.h ffsrever: Make the status page bitexact if any stream is bitexact 2016-11-29 19:26:26 +01:00
ffserver.c ffserver: Check chunk size 2016-12-05 21:30:12 +01:00
INSTALL.md INSTALL: add markdown syntax 2014-05-28 22:38:38 +02:00
library.mak Merge commit 'c5fd4b50610f62cbb3baa4f4108139363128dea1' 2016-06-27 19:39:46 +02:00
LICENSE.md lavfi/f_ebur128: relicense to LGPL 2016-11-27 20:46:20 +01:00
MAINTAINERS MAINTAINERS: update 2016-12-27 18:24:31 +01:00
Makefile Merge commit '6641819feedb086ebba3d2be89b8d33980f367e1' 2016-06-26 15:43:05 +02:00
README.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
RELEASE RELEASE: Update for past 3.2 branch 2016-10-26 20:52:43 +02:00
version.sh version.sh: Fix spurious rebuilds. 2016-03-10 09:53:10 +01:00

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.