[gst-devel] Mixing streams

Lucas Alberto lucasa at gmail.com
Mon Jun 14 20:27:46 CEST 2010

Hi Andres,

You should take a look at SLTV, a new open source streaming tool that I'm
This project is already capable to do live switch and mix different video
sources (firewire DV, webcam, X11), apply video effects and text overlay.
SLTV is implemented in python with gstreamer and GTK. We are planning to
launch a stable version next month, and use it to streaming the eleventh
edition of the International Free Software Forum [1] in Brazil.

This is the web page of the project:

Luciana Fujii, a member of this list, is working in this project too.

[1] http://softwarelivre.org/fisl11/english/about-the-event

Lucas Alberto

2010/6/14 <gstreamer-devel-request at lists.sourceforge.net>
> Message: 3
> Date: Mon, 14 Jun 2010 16:14:16 +0200
> From: Andres Gonzalez <acandido at hi-iberia.es>
> Subject: [gst-devel] Mixing streams
> To: gstreamer-devel at lists.sourceforge.net
> Message-ID: <4C163938.2070109 at hi-iberia.es>
> Content-Type: text/plain; charset="iso-8859-1"
> Hello everybody,
> I am learning gstreamer.  My goal is making a simple video mixer
> application, that will allow the user  to select between several input
> streams (coming from FireWire, Webcam, local file, ...) on real time.
> The key feature is that there is a continuous output video stream, just
> like it had been generated with a video editor previously.
> As I am a newbie with gstreamer, as a training, first I am trying the
> same with audio streams, extending the "helloworld.c" given in gstreamer
> documentation. The very first step is a small program that concatenates
> two ogg files, but it fails because the second stream is not written. (I
> attach the source file). Also, if I try to switch the streams when  the
> first song is not over (other variation of the program), I get a
> run-time "data stream internal error".
> What I am doing wrong?
> Thanks for any help,
> Andr?s
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