[gst-devel] Help! a very simple question..

Manish Rana manish.rana at gmail.com
Wed Feb 27 08:17:57 CET 2008


Hi Yue,

Please check the answers below.
I have tried my best to give the answers, but apologies for any wrong
arguments.. :)

On Wed, Feb 27, 2008 at 12:13 PM, Yue Li <liyue99 at gmail.com> wrote:

> Hi,
>
> I'm new to Gstreamer and this mail list. So I know maybe my question
> is too stupid.
> But I really couldn't find the answer and need your help.
>
> I just tried to decode a mpeg file like below:
>
> gst-launch filesrc location=mpeg2.mpg ! mpegdemux name=demux video_00!
> { queue ! mpeg2dec ! xvideosink }
>
> but got the error message :
>
> WARNING: erroneous pipeline: no element "video_00"

The currect pipeline for this should be :
gst-launch filesrc location=mpeg2.mpg ! mpegdemux name=demux {
demux.video_00 ! queue ! mpeg2dec ! xvideosink }
as the demuxer is a parent of the video_00 pad.


>
> Then I tried:
>
> gst-launch filesrc location=mpeg2.mpg ! mpegdemux ! fakesink
>
> and got:
>
> Setting pipeline to PAUSED ...
> Pipeline is PREROLLING ...
> ERROR: from element /pipeline0/filesrc0: Internal data flow error.
> Additional debug info:
> gstbasesrc.c(2099): gst_base_src_loop (): /pipeline0/filesrc0:
> streaming task paused, reason not-linked (-1)
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to NULL ...
> FREEING pipeline ...
>
I am not very much sure of this, as this should have worked fine.
Please try giving the caps filter ( not a good practice.) before mpeg2demux.

Hope this will help you.......

>
> I know this question may be too simple to you but please help me...
>
> Thank you!
> Yue Li
>
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-- 
Manish Rana
Software Engg.
Handset Technology Solution,
Sasken Comm. Tech.
Bangalore,India
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