[FFmpeg-user] named pipes ffmpeg

[Roger Pack]

On 4/29/16, Robin Stevens <robin at seascape.nl> wrote:
> I am having trouble to get ffmpeg write to a named pipe in windows. I know
> it's possible to write to a anonymous pipe with the command:
>
> ffmpeg.exe -vsync passthrough -f dshow -i video="AVerMedia SD 1
> Capture":audio="AVerMedia SD Audio Cap 1 (AVerM" -vcodec rawvideo -f
> matroska -
>
> And I can read the pipe with ffplay.exe -i -
>
> But is it possible to write to a named pipe?
>
> I tried to by creating a named pipe with the following c# code:
>
> NamedPipeServerStream p_from_ffmpeg = new NamedPipeServerStream("tmp_pipe1",
>                 PipeDirection.In,
>                 1,
>                 PipeTransmissionMode.Byte,
>                 PipeOptions.WriteThrough,
>                 1000, 1000);
>
> I checked if the pipe really exist with the pipelist.exe from
> https://technet.microsoft.com/en-us/sysinternals/dd581625.aspx.
>
> Then I tried to write the output data from ffmpeg to the pipe by using the
> following command:
>
> ffmpeg.exe -vsync passthrough -f dshow -i video="AVerMedia SD 1
> Capture":audio="AVerMedia SD Audio Cap 1 (AVerM" -vcodec rawvideo -f
> matroska tmp_pipe1
>
> and the following:
>
> ffmpeg.exe -vsync passthrough -f dshow -i video="AVerMedia SD 1
> Capture":audio="AVerMedia SD Audio Cap 1 (AVerM" -vcodec rawvideo -f
> matroska pipe:1 > tmp_pipe1
>
> Both commands are adding a file named "tmp_pipe1" to the directory of the
> ffmpeg executable while the anonymous pipe isn't adding a file and is
> working perfectly for me. The only problem is that I would like to
> deinterlace, record with a codec and render/view more than one channel. So I
> thought to run one instance of ffmpeg and pipe the outputs to multiple
> instances of ffplay. I don't know whether it's possible to write the output
> of ffmpeg to a named pipe in windows. Does someone has an answer?

I think you have to name it something like
\\pipe_name
or some odd...