[FFmpeg-user] How to use the audio filter

[Pavel Koshevoy]

On 7/5/12 1:27 AM, iefvＨＲＳ wrote:
> How to use the audio filter "atempo" as  command line parameters
>
> such as
>
>
> ffmpeg -i youku.flv -af atempo=1.25
>
>
> But it no use.and a error found!

You need to post the error here. Anyway, here is how I do it:

./ffmpeg -i /scratch/DataSets/Video/au/02\ Feeling\ Good.mp3 -filter:a 
"atempo=0.7" -y /scratch/FeelingGood-0.7.wav

This slows down the audio 70%

Pavel.