[gst-devel] Video editing

[Adam Lofts]

Thanks for the help. 

I've had a look at gnonlin, it seems useful - my problem being that i
would have to wrap it to use in c# (but it remains a possibility).

How should the pipeline be threaded? Would putting each individual
source in a thread be better?

Thanks,

Adam

On Mon, 2004-07-19 at 09:39, Thomas Vander Stichele wrote:
> Hi,
> 
> 
> > I would like to create a video editing application, based on a timeline
> > using gstreamer. Audio and video samples would be arranged on this
> > timeline, similar to the interface in Flash MX.
> 
> GStreamer is a good base to work off.  You could also check out gnonlin
> (gnonlin.sourceforge.net), which is currently worked on by a group of
> French students (I believe in the gnonlin-ng directory).  This extends
> GStreamer to make a non-linear editing library.
> 
> > I have a basic idea of how to use gstreamer (i ported a few samples to
> > c#) but cannot see how the syncronisation of media streams would work. I
> > undersand that all buffers in gstreamer are timestamped, so this should
> > be possible?
> 
> Yes, buffers in GStreamer are supposed to be timestamped when it makes
> sense.  Muxers will do the right thing with these timestamps so
> editing/transcoding should work correctly.  For recording, some work has
> recently been done to get better synchronisation and it seems to work
> well for us.  For playback, sinks listen to a common clock so that
> buffers with the same timestamps are played at the same time.
> 
> 
> > Also, can video be "mixed" in gstreamer? - the swfdec plugin might be
> > able to overlay vector graphics on a video stream for example.
> 
> Yes - there is a generic videomixer element that we use to overlay png
> images, for example.  Some other elements also overlay, like textoverlay
> and timeoverlay.  I could be wrong, but I don't think swfdec does - it's
> just a decoder for the shockwave format.  Internally it probably has
> compositing or overlaying.
> 
> Thomas
> 
> 
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> 
>