why gst-launch doesnot work in my Ubuntu?

[Tom]

1.MPG is 640X480, and framerate is 25.

On Sun, Feb 20, 2011 at 1:48 PM, Tim-Philipp Müller <t.i.m at zen.co.uk> wrote:

> On Sun, 2011-02-20 at 13:37 -0600, Tom wrote:
>
> > gst-launch filesrc "location=1.MPG" ! decodebin ! video/x-raw-yuv,
> > width=640,height=480,framerate=5/1 ! ffmpegcolorspace ! jpegenc !
> > multipartmux ! tcpserversink host=192.168.2.1 port=5000
> >
> > and then got an error:
> > ..
> > stream stopped, reason not-negotiated
> > ..
> > I don't know why.....
>
> This usually means there's a problem with caps somewhere.
>
> My first guess would be that your input video 1.MPG does not have a
> resolution of 640x480. If you want to scale the input video to this
> resolution, put a videoscale element between decodebin and the caps
> filter.
>
> (If that's not it, maybe you could provide the output of also passing -v
> to gst-launch.)
>
>  Cheers
>  -Tim
>
>
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