[gst-devel] Mixing starting/stopping/disconnecting sources: multiqueue + freeze?

[Sjoerd Op 't Land]

Thanks Florent for your suggestion, I didn't know the glmosaic plugin  
and it might prove useful in a later stage. However, this is not my  
current problem.

My current problem is how to mix (e.g. using videomixer) between  
multiple, asynchronous, starting and stopping streams. For example, I  
want to be able to connect an extra source (e.g. an RTP stream, a  
movie file, a text generator) during a live performance, and then  
dissolve to this source. Later on I want to switch away from this  
source, and then disconnect the source. Meanwhile, the live output  
should still continue.

If I understand correctly, multiqueue synchronises multiple sources to  
one clock (correct?). If that's correct, part of the problem is  
solved. However, it seems that multiqueue stays STOPPED as long as it  
hasn't received at least one buffer from all of its inputs. Therefore,  
I thought, maybe I could write or use an element that repeats the same  
buffer until the real source produces a (new) buffer.

Is this the way to go?

Thanks in advance,
Sjoerd


Op 2 jan 2010, om 18:19 heeft Florent het volgende geschreven:

> Hi
>
>> For the moment, we are looking for live seamless (low-
>> latency) cutting and fading between sources. If I understand the
>> GNonLin documentation correctly, this is not possible with GNonLin
>> specifically. Correct?
>
> low level gnonlin elements will let you do file-based compositing
> (i.e. defining portions of media to feed to the pipeline, such as e.g.
> second 2 to 16 from a video file) with the gstreamer approach, but it
> is not live performance oriented.
>
> For live compositing/switching, you have two options as far as i know:
> * the lagacy videomixer [1], which might let you overlay multiple  
> AYUV streams
> * gst-plugins-gl's glmosaic plugin [2], which is an example of
> opengl-based compositing in gstreamer. It can be used as a starting
> point to create a video mixer
>
> There used to be a "switcher" element, but i don't know why it  
> disappeared.
>
> [1] http://gstreamer.freedesktop.org/data/doc/gstreamer/0.10.1/gst-plugins-good-plugins/html/gst-plugins-good-plugins-videomixer.html
> [2] http://cgit.freedesktop.org/gstreamer/gst-plugins-gl/tree/gst/gl/gstglmosaic.c
>
> Florent
>
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