[gst-devel] How to create a video recording buffer from a live broadcast and read from it at the same time

Fri Nov 26 10:40:48 CET 2010

Hi Marco Ballesio thank you again for the support. Before I start to implement your proposals, I want to ask you some questions. Let me respond to your request first
> only. Do you have special requirements about using SIP in your AS
> media controller?
No, I don't have. I can use RTSP.

> Wim's rtsp streaming server will probably help you with all of this:
Thank you. I'll download and check it.

My questions are:
- Is it possible to read from a file that is being written by another process? I mean the second server is going to read from teh file that the first server is writing to.

> by periodically looping (through a timer) on the first server you may
> implement a basic way to re-start the file each n minutes.

Please clarify what you mean by restart the file.

> More elegant ways may involve a valve element and transitions to NULL
> state/eos for the filesink element only.

What will this (valve) element do?

Thank you.

Best regards,

- Zelalem S. 

> Date: Thu, 25 Nov 2010 19:59:05 +0200
> From: gibrovacco at gmail.com
> To: gstreamer-devel at lists.sourceforge.net
> Subject: Re: [gst-devel] How to create a video recording buffer from a live broadcast and read from it at the same time
> 
> Hi,
> 
> On Thu, Nov 25, 2010 at 3:33 PM, Zelalem Sintayehu <zelalems at hotmail.com> wrote:
> > Hi Dear Marco Ballesio thank you for your prompt response. I'm a student and
> > want to do this as a project. Basically I want to have a kind of network
> > based recorder which is controlled by either SIP or RTSP from an application
> > server. Those are the two protocols that I was thinking about to use.
> > Currently I have an RTSP proxy that I developed which is controlled by a SIP
> > Application Server (AS) and delivers the media to a client. So I want to
> > extend it a little further so that when it is told to pause, it will pause
> > the stream it gets from the server (which basically means recording it for
> > later use) and again when told to resume starts the delivery from the place
> > where it was paused. The client (a SIP) is just a passive media reciever.
> 
> in my understanding it should be possible to do all of this with RTSP
> only. Do you have special requirements about using SIP in your AS
> media controller?
> 
> > the media control comes from the application server. I also want to use a
> > client with basic RTSP capability but still the media control comes from the
> > AS or media controller. With regard to bandwith limitation I don't have
> > badndwidth costraints, but I'm thinking that the recorder should have a
> > limited (specified) buffer size. It can't go on recording forever. I also
> > only want this to work for one client. Hope I have attended your queries.
> >
> > Once again thank you for your support.
> 
> A few ideas. Disclaimer: I've not personally tried them, so your
> mileage to get the thing working may vary..
> 
> Wim's rtsp streaming server will probably help you with all of this:
> 
> http://people.freedesktop.org/~wtay/
> 
> in my understanding, you would need to setup two servers:
> 
> - the first one streaming from the camera AND locally saving to file
> (through, between the others, a tee element and an mp4mux with the
> option "faststart" set to true).
> 
> - the second one providing the file saved from the first one.
> 
> by periodically looping (through a timer) on the first server you may
> implement a basic way to re-start the file each n minutes. More
> elegant ways may involve a valve element and transitions to NULL
> state/eos for the filesink element only.
> 
> Regards
> 
> >
> > Best regards,
> >
> > - Zelalem S.
> >
> >
> >
> >
> >> Date: Thu, 25 Nov 2010 13:39:37 +0200
> >> From: gibrovacco at gmail.com
> >> To: gstreamer-devel at lists.sourceforge.net
> >> Subject: Re: [gst-devel] How to create a video recording buffer from a
> >> live broadcast and read from it at the same time
> >>
> >> Hi,
> >>
> >> On Wed, Nov 24, 2010 at 12:13 PM, Zelalem Sintayehu
> >> <zelalems at hotmail.com> wrote:
> >> > Hi I want to create a program using gstreamer that when activated starts
> >> > to
> >> > record a live broadcast and when requested starts to deliver what is
> >> > being
> >> > recorded from the beginning of the record while keeping on recording on
> >> > the
> >> > other end (the live broadcast). At some point I want to ignore recording
> >> > and
> >> > go live. I hope gstreamer could be used to do this. Basically my problem
> >> > is
> >> > to create a buffer of a file that I can read and write into it at the
> >> > same
> >> > time.  Please advice me how I can do this.
> >>
> >> Imo there are many ways for achieving this, some of which being easy,
> >> other more difficult. The freedom you'll have in your design depends
> >> on some variables:
> >>
> >> - You'll anyway have to use a signalling protocol (e.g. RTSP, SIP,
> >> XMPP, etc..) to make it working, so you'll have to carefully pick the
> >> one which better suits your requirements (e.g. RTSP is pretty well
> >> supported from GStreamer from both sides, for SIP or XMPP I suggest
> >> you to give a look to the telepathy framework).
> >>
> >> - Are you planning to make it compatible with standard clients? If
> >> yes, which protocols do they use? If not, are you planning to write
> >> the client application as well?
> >>
> >> - Do you have resource constraints (network bandwidth, CPU, disk, memory)?
> >>
> >> - Is it possible that multiple clients will connect to the same server?
> >>
> >> If you can clarify the points of above it would be possible to give
> >> you, in turn, an appropriate answer.
> >>
> >> Regards
> >>
> >> >
> >> > Thank you.
> >> >
> >> > Best regards,
> >> >
> >> > - Zelalem S.
> >> >
> >> >
> >> >
> >> >
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