read live file

[Tiago Katcipis]

I don't know exactly what you mean with "live files", just as Sebastian
pointed out, the first thing that came to my head was unix sockets.

I imagine that you are trying to do this because each pipeline is running
on a different process, if this is the case maybe the shared memory
pluginswill do the trick to you:

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-
plugins/html/gst-plugins-bad-plugins-shmsrc.html

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-
plugins/html/gst-plugins-bad-plugins-shmsink.html


On Mon, May 12, 2014 at 4:15 AM, Sebastian Dröge
<sebastian at centricular.com>wrote:

> On So, 2014-05-11 at 21:09 +0200, Bernhard Graaf wrote:
> > One short question:
> >
> >
> >
> > Do we have a module to work with a live file?
> >
> > I have to different pipelines. One pipeline to write into a file, one
> > pipeline to read from the same.
> >
> > I have tried to use filesrc, fdsrc and playbin to read the file, but
> every
> > module stops playing after a short time (the length of the file during
> > opening).
> >
> > Or is there any trick in a C-Program to persuade the reading module to
> read
> > forward (I've try to ignore EOS, but with the same result)?
>
> filesrc is checking if the file size has changed when it reaches the
> end, and will then read any newly added data. And then check again.
>
> However this setup is never going to work reliable as there is no
> synchronisation at all between the writing process and the reading
> process. You'll most likely often get into the case where filesrc reads
> over the end of the already written file and then goes to EOS, and only
> then the writer adds some further data.
>
> The real solution for this problem would be to either use pipe or socket
> for the data transfer instead of going over the file system (and then
> use fdsrc), or to properly integrate the writer into the GStreamer
> pipeline with an appsrc or a custom source element instead of using a
> file.
>
> --
> Sebastian Dröge, Centricular Ltd - http://www.centricular.com
> Expertise, Straight from the Source
>
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>
>
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