[FFmpeg-user] tee pseudo muxer instance -> pipe to ncat

[Dragan Randjelovic]

 Dear Moritz,

I don't mean to be too picky about your choice of words, but you are
> not telling us what you are trying to achieve, but only what you are
> actually trying. ;-)
>

I am not really sure what you are referring to :) I am trying to copy the
stream and prepare it for a different transport... one push one pull one
reliable one unreliable, one connectionless one connection oriented :)
But I am open to discuss specifics.

So you're trying to output both to udp and to a pipe, which goes to
> netcat?
>
True.

Thanks for providing a tip. Actually I am not sure how I would incorporate
listem 1 into a tee muxer and I would appreciate your help.
In regards to the tee muxer I could only think of "tcp://ip:port?listen "
syntax.

Capital L is listen closely :) - or re-listen on socket close. Does listen
1 switch provides the same behavior ?

re-listen on socket close ? timeouts etc... What if I shortly lose
connectivity and I want it reestablished ?
I am also not aware of nc64 buffering mechanisms so eventually it might or
might not work. Indeed I am trying/testing

EX. stransmit was not performing well in my case over unreliable link with
hevc-mpegts. Rather I had to shape the stream and go with tcp.
I could not try rtp_mpegts/rtsp_transport tcp/prompeg features as I am not
aware of software player being able to listen for columns and rows checksum
on two different ports.... I was looking for elecard... (please suggest)
and just a few days ago there was an email about missing metadata support
in rtp_mpetgts muxer....

Regards.
Dragan



On Sun, Jul 15, 2018 at 10:25 PM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Sun, Jul 15, 2018 at 21:46:58 +0200, Dragan Randjelovic wrote:
> > I am trying to achieve the following under windows and I am wondering
> what
> > would be the right syntax for it,
> > while explicitly I do not want to invoke another ffmpeg process.
> >
> > -f tee "[onfail=ignore][f=mpegts] pipe:1>nc64 -L -p
> > 1234|[f=mpegts]udp://IP:1234/"
>
> I don't mean to be too picky about your choice of words, but you are
> not telling us what you are trying to achieve, but only what you are
> actually trying. ;-)
>
> So you're trying to output both to udp and to a pipe, which goes to
> netcat?
>
> The nc call needs to be outside the ffmpeg command, receiving its data
> from the pipe. You would attach that on the command line as
>   | nc64 -L -p 1234
> (a pipe _after_ the ffmpeg command, which picks up its stdout).
>
> Note the '|'. The '>' you used is an operator for redirecting to files.
> The redirection also shouldn't be part of ffmpeg's muxer command.
>
> BTW, ffmpeg can also listen on a TCP port, as you're doing with netcat:
> $ ffmpeg [...] -listen 1 -f mpegts tcp://localhost:1234
> Don't ask me how to combine that into the tee muxer's syntax, I'm sure
> you're up to that task already. :-)
>
> Cheers,
> Moritz
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