Beside, in your paste, there is no ffmpegcolorspace at all.
I tried your pipeline with some movies (audio/video).
gst-launch -v rtspsrc location=rtsp://localhost/sample_100kbit.mp4 ! decodebin ! ffmpegcolorspace ! textoverlay text="Hello Wolrld" ! autovideosink

When I have a ffmpegcolorspace before textoverlay, it is always ok.
when not, pipeline always fails to link.

Best is ffmpegcolorspace does nothing : caps on src and sink are the same.

This also works if ffmpegcolorspace is replaced by any element with "always pads" like videoscale or videorate.

I think this is a gst-launch negotiation problem : decodebin has a "sometimes" src pad and textoverlay has 2 sink pads.

It also works without ffmpegcolorspace if you change textoverlay to clockoverlay (1 sink pad) or timeoverlay


--- En date de : Jeu 31.7.08, Michael Smith <msmith@xiph.org> a écrit :
De: Michael Smith <msmith@xiph.org>
Objet: Re: [gst-devel] Reading and displaying a rtsp stream
À: "Discussion of the development of GStreamer" <gstreamer-devel@lists.sourceforge.net>
Date: Jeudi 31 Juillet 2008, 19h25

On Thu, Jul 31, 2008 at 12:21 AM, Ekrem SEREN <ekrem.seren@gmail.com>
wrote:
> I'm trying to read a rtsp stream over network and view/record it.
PlayBin
> works fine with rtsp like below;
>
> $ gst-launch playbin uri=rtsp://localhost:5554/Camera1
>
> It displays the stream. But I couldn't get it to work with my own
pipeline;
>
> $ gst-launch -v rtspsrc location=rtsp://localhost:5554/Camera1 ! decodebin
!
> fmpegcolorspace ! textoverlay text="fsvbzlvcjzjhkvhlkczvjkd " !
autovideosink

Does it work with another ffmpegcolorspace after the textoverlay? Your
video sink might not support I420 (the only format that textoverlay
supports).

You also in general might need a videoscale (though probably not in this case).

Mike

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