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Andreas Rheinhardt be0a2515ab avformat/matroskaenc: Don't override samplerate for CodecDelay 
Opus can be decoded to multiple samplerates (namely 48kHz, 24KHz,
16Khz, 12 KHz and 8Khz); libopus as well as our encoder wrapper
support these sample rates. The OpusHead contains a field for
this original samplerate. Yet the pre-skip (and the granule-position
in the Ogg-Opus mapping in general) are always in the 48KHz clock,
irrespective of the original sample rate.

Before commit c3c22bee63, our libopus
encoder was buggy: It did not account for the fact that the pre-skip
field is always according to a 48kHz clock and wrote a too small
value in case one uses the encoder with a sample rate other than 48kHz;
this discrepancy between CodecDelay and OpusHead led to Firefox
rejecting such streams.

In order to account for that, said commit made the muxer always use
48kHz instead of the actual sample rate to convert the initial_padding
(in samples in the stream's sample rate) to ns. This meant that both
fields are now off by the same factor, so Firefox was happy.

Then commit f4bdeddc3c fixed the issue
in libopusenc; so the OpusHead is correct, but the CodecDelay is
still off*. This commit fixes this by effectively reverting
c3c22bee63.

*: Firefox seems to no longer abort when CodecDelay and OpusHead
are off.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
 		2022-09-05 20:33:59 +02:00
compat
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doc fftools/ffprobe: Report initial and trailing padding 2022-09-05 20:32:12 +02:00
ffbuild
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fftools fftools/ffprobe: Report initial and trailing padding 2022-09-05 20:32:12 +02:00
libavcodec avcodec/cfhddata: Reduce stack usage 2022-09-05 14:28:20 +02:00
libavdevice
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libavfilter avfilter/vf_gblur: handle cases when parameters become invalid 2022-09-04 16:41:44 +02:00
libavformat avformat/matroskaenc: Don't override samplerate for CodecDelay 2022-09-05 20:33:59 +02:00
libavutil lavu/fifo: clarify interaction of AV_FIFO_FLAG_AUTO_GROW with av_fifo_write() 2022-09-05 08:59:36 +02:00
libpostproc
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libswresample
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libswscale
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presets
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tests avformat/matroskaenc: Only write DiscardPadding if nonzero 2022-09-05 20:33:09 +02:00
tools
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.gitattributes
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.gitignore
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.mailmap
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.travis.yml
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CONTRIBUTING.md
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COPYING.GPLv2
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COPYING.GPLv3
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COPYING.LGPLv2.1
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COPYING.LGPLv3
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CREDITS
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Changelog lavc/vaapi: Add support for remaining 10/12bit profiles 2022-09-03 16:19:40 -07:00
INSTALL.md
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LICENSE.md
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MAINTAINERS
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Makefile
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README.md
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RELEASE
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configure lavf/dv: always provide avpriv_dv_* symbols 2022-09-05 08:01:17 +02:00

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 means to alter decoded audio and video through a directed graph of connected 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.
  • 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.