[FFmpeg-user] redirect to 2 fifo files

Zoltan Kerenyi Nagy kerenyi.nagy.zoltan at gmail.com
Tue Jan 29 08:18:21 EET 2019

 $ ... -f wav pipe:3 -f wav pipe:4 3>fifo1 4>fifo2

That's impossible since:
pipe:1 stdout
pipe:2: sterr
pipe:0 stdin

I got it working this way:

The only thing have left is the video representation of the audio, which is
a bonus to my sleep recorder experimental application

On Tue, 29 Jan 2019 at 01:33, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Mon, Jan 28, 2019 at 20:38:48 +0100, Zoltan Kerenyi Nagy wrote:
> > Anyhow your solution only creates files, not named pipes (fifo).
> You can tell ffmpeg to "overwrite" them by using "-y". It should just
> reuse them, not actually delete them and replace them with files.
> (Works for me.)
> > I'd like to create 2 fifos with the same data coming from the analog
> input.
> > The documentation says that I need to utilize pipe:1 which means output.
> > I just cant figure out how can I write to 2 fifos at the same time
> In theory, you should be able to do
> $ ... -f wav pipe:3 -f wav pipe:4 3>fifo1 4>fifo2
> but I didn't get this to work.
> Moritz
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