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doc::libswresample
Section: (3)
Updated:
Index NAME
libswresample - audio resampling library
DESCRIPTION
The libswresample library performs highly optimized audio resampling,rematrixing and sample format conversion operations.
Specifically, this library performs the following conversions:
- *
- Resampling: is the process of changing the audio rate, forexample from a high sample rate of 44100Hz to 8000Hz. Audioconversion from high to low sample rate is a lossy process. Severalresampling options and algorithms are available.
- *
- Format conversion: is the process of converting the type ofsamples, for example from 16-bit signed samples to unsigned 8-bit orfloat samples. It also handles packing conversion, when passing frompacked layout (all samples belonging to distinct channels interleavedin the same buffer), to planar layout (all samples belonging to thesame channel stored in a dedicated buffer or ``plane'').
- *
- Rematrixing: is the process of changing the channel layout, forexample from stereo to mono. When the input channels cannot be mappedto the output streams, the process is lossy, since it involvesdifferent gain factors and mixing.
Various other audio conversions (e.g. stretching and padding) areenabled through dedicated options.
SEE ALSO
ffmpeg(1),
ffplay(1),
ffprobe(1),
ffmpeg-resampler(1),
libavutil(3)
AUTHORS
The FFmpeg developers.
For details about the authorship, see the Git history of the project(git://source.ffmpeg.org/ffmpeg), e.g. by typing the commandgit log in the FFmpeg source directory, or browsing theonline repository at <http://source.ffmpeg.org>.
Maintainers for the specific components are listed in the fileMAINTAINERS in the source code tree.
Index
- NAME
- DESCRIPTION
- SEE ALSO
- AUTHORS
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