[FFmpeg-user] need an example unix domain sockets usage

[Ratheendran R]

Thanks Moritz,

You explanation was helpful.

On Sat, May 13, 2017 at 1:07 AM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Fri, May 12, 2017 at 19:41:10 +0530, Ratheendran R wrote:
> > *I am trying to ffmpeg and ffplay commands on ubuntu as below.the ffplay
> > <command > gives a permission denied. ffmpeg exits immediatly *
> >
> > >>>>* ./ffplay -f mpegts unix:///tmp/ff.socket&
> > *>>>>* sleep 2&&  ./ffmpeg_g -re -i something -vcodec copy -acodec copy
> -f
> > *>>
> > * mpegts unix://tmp/ff.socket
> > *
> >
> > *I am not able to make any progress for some time,please let me know
> > if I am missing anything.*
>
> First of all, your paths to the socket are different:
> unix:///tmp/ff.socket
> unix://tmp/ff.socket
>
> Secondly, unlike what the ffmpeg documentation says, it looks like you
> need to add *no* extra slashes, so the correct URI is
> unix:/tmp/ff.socket
> (It shouldn't matter in this case, the OS ignores the extra slashes.)
>
> Thirdly, with your commands, both commands should give "no such
> file or directory", because ffmpeg needs to feed (and create) the
> socket first, before ffplay can access it.
>
> Fourthly, to create a socket, you need to add the "-listen 1" option
> to the ffmpeg command line.
>
> Fifthly, if you launch ffmpeg first and try to put it to the
> background, you need to disable its interaction with the terminal, by
> adding "-nostdin" (otherwise, it stalls in my attempts).
>
> I succeeded with this:
>
> $ ffmpeg -nostdin -f lavfi -i testsrc -f mpegts -listen 1
> unix:/tmp/ffmpeg.socket & ffplay unix:/tmp/ffmpeg.socket
>
> (ffplay doesn't need "-f mpegts" in this scenario.)
>
> Moritz
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