| | 1 | From December 2012, FFmpeg supports high-quality audio resampling using the SoX Resampler library ('libsoxr'). |
| | 2 | |
| | 3 | To build FFmpeg with libsoxr, it must first be installed. On unix-like systems, it may be available as an installable package from your OS provider; otherwise, libsoxr should be installed from source code downloaded from http://sourceforge.net/projects/soxr -- either a versioned tar-file, or a git 'clone'. Once downloaded (and unpacked, in the case of a tar file), it should be built and installed according to the instructions in the INSTALL file (included in the source distribution). |
| | 4 | |
| | 5 | With libsoxr installed, ./configure --enable-libsoxr configures the FFmpeg to use libsoxr. |
| | 6 | |
| | 7 | To invoke ffmpeg with the SoX Resampler, the option '-af aresample=resampler=soxr' should be given; e.g. |
| | 8 | |
| | 9 | ffmpeg -i my-48000.wav -af aresample=resampler=soxr -ar 44100 my-44100.wav |
| | 10 | |
| | 11 | In case of need to change the default resampling bit precision or preserved bandwidth, see the ffmpeg manual page 'ffmpeg-resampler'. |
