Best way to concatenate and play streams

[Ralph]

Normally you don't need any queues.
You need two separate gnlcomposition chains in your pipeline: one for audio,
another for video.  You can't mix video and audio in one gnlcomposition
object.  This is how the whole pipeline shoul look like:

gnlfilesource  -  gnlcomposition - audioconvert - audioresample - volume -
autoaudiosink
gnlfilesource  /
...              /

gnlfilesource  -  gnlcomposition - ffmpegcolorspace - autovideosink
gnlfilesource  /
...              / 


You need to link each gnlcomposition object with
autoaudiosink/ffmpegcolorspace when a new file has been decoded and dynamic
audio/video pad has been created.
For example for the video chain subscribe to PadAdded event when creating
the pipeline (the code in C#):
                videoComposition.PadAdded += new
Gst.PadAddedHandler(OnVideoPadAdded);
                videoComposition.PadRemoved += new
Gst.PadRemovedHandler(OnVideoPadRemoved);

When the first file is opened and a dynamic video pad is created on the
video gnlcomposition object, connect ffmpegvideospace with gnlcomposition:
        private void OnVideoPadAdded(object sender, Gst.PadAddedArgs args)
        {
            Gst.Element.Link(videoComposition, ffmpegColorSpace);
        }

        private void OnAudioPadRemoved(object sender, Gst.PadRemovedArgs
args)
        {
            Gst.Element.Unlink(videoComposition, ffmpegColorSpace);
        }

You need to do the same with the audio chain.

I'm pretty busy now and I don't have time to analyse your code, hopefully
this should be enough information for you to get it working.



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