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, for example from a high sample
           rate of 44100Hz to 8000Hz. Audio conversion from high to low sample rate is a lossy
           process. Several resampling options and algorithms are available.

       •   Format conversion: is the process of converting the type of samples, for example from
           16-bit signed samples to unsigned 8-bit or float samples. It also handles packing
           conversion, when passing from packed layout (all samples belonging to distinct
           channels interleaved in the same buffer), to planar layout (all samples belonging to
           the same channel stored in a dedicated buffer or "plane").

       •   Rematrixing: is the process of changing the channel layout, for example from stereo to
           mono. When the input channels cannot be mapped to the output streams, the process is
           lossy, since it involves different gain factors and mixing.

       Various other audio conversions (e.g. stretching and padding) are enabled 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
       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in the FFmpeg source
       directory, or browsing the online repository at <https://git.ffmpeg.org/ffmpeg>.

       Maintainers for the specific components are listed in the file MAINTAINERS in the source
       code tree.

                                                                            doc::libswresample(3)