[FFmpeg-user] removing audio from section of video

[johnd]

On Mon, Jan 21, 2013 at 01:26:33PM -0900, Lou wrote:
> On Tue, 15 Jan 2013 13:25:51 -0800
> johnd <john at jjdev.com> wrote:
> 
> > I have an input video.  At 10 seconds into the video I want to remove
> > audio for 5 seconds, then have the audio continue.
> 
> You can use the afade filter by Paul B Mahol that was committed today.
> This means that you will have to find a very recent build or compile
> ffmpeg yourself. It will allow you to fade the audio at specific
> interval(s).
> 
> http://ffmpeg.org/ffmpeg-filters.html#afade
> 
> You can copy the video stream with "-c:v copy" to prevent video
> re-encoding.

this looks great but I can't figure out how to set more
than one event

How do I pass more stuff like 'turn back on at a time'


I tried this: 
ffmpeg -y  -i withsound.mp4  -c:v copy -af "afade=t=out:st=2,afade=t=in:st=5"   done.mp4

but my end video was all silent


I'd like to be able to tell it to turn off audio then back, then repeat
that process...