Please add a -af option for libavfilter audio filters.

[Jeremy Salwen]

It would be nice if the -af option worked for audio filters like the -vf one does for video filters (according to the documentation, it should).

Console output:
./audio/ffmpeg/ffmpeg -i write.wav -af volume=0.1 ~/lol.wav
ffmpeg version N-35540-g0cc9949, Copyright (c) 2000-2011 the FFmpeg developers

built on Dec 7 2011 22:26:02 with gcc 4.6.1
configuration: --enable-filter=earwax
libavutil 51. 30. 0 / 51. 30. 0
libavcodec 53. 41. 2 / 53. 41. 2
libavformat 53. 24. 0 / 53. 24. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 51. 0 / 2. 51. 0
libswscale 2. 1. 0 / 2. 1. 0

[wav @ 0x2a387e0] parser not found for codec pcm_s16le, packets or times may be invalid.
[wav @ 0x2a387e0] max_analyze_duration 5000000 reached at 5015510
Input #0, wav, from 'write.wav':

Duration: 00:04:01.86, bitrate: 1411 kb/s

Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s

Unrecognized option 'af'
Failed to set value 'volume=0.1' for option 'af'

[Marcos Mello]

I second this request.

[dave rice]

I third this request. :)

[Elon Musk]

It appears this have been implemented.