Audio options:

-aframes number     set the number of audio frames to output

-aq quality         set audio quality (codec-specific)

-ar rate            set audio sampling rate (in Hz)

-ac channels        set number of audio channels

-an                 disable audio

-acodec codec       force audio codec ('copy' to copy stream)

-vol volume         change audio volume (256=normal)

-af filter_graph    set audio filters

Advanced Audio options:

-atag fourcc/tag    force audio tag/fourcc

-sample_fmt format  set sample format

-channel_layout layout  set channel layout

-guess_layout_max   set the maximum number of channels to try to guess the channel layout

-absf audio bitstream_filters  deprecated

-apre preset        set the audio options to the indicated preset