Help! a very simple question..
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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" 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 know this question may be too simple to you but please help me... Thank you! Yue Li ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Help! a very simple question..
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2008/2/27, Yue Li <[hidden email]>:
> Hi, Hi! > I just tried to decode a mpeg file like below: > > gst-launch filesrc location=mpeg2.mpg ! mpegdemux name=demux video_00! > { queue ! mpeg2dec ! xvideosink } 1. You don't need to specify the pad name (video_00) 2. xvideosink doesn't exist, it's xvimagesink. 3. the {} notation isn't necessary 4. when decoding just the video, the queue isn't neccessary (and seems like it fails to link with mpeg2dec) So try this instead: gst-launch -v filesrc location=mpeg2.mpg ! mpegdemux ! mpeg2dec ! xvimagesink With audio: gst-launch -v filesrc location=mpeg2.mpg ! mpegdemux name=demux ! mpeg2dec ! queue ! xvimagesink demux. ! mad ! queue ! audioconvert ! alsasink (for some reason the queues do not work if they are before the decoder elements, I wonder why...?) Hope this helps. -- Kalle Vahlman, [hidden email] Powered by http://movial.fi Interesting stuff at http://syslog.movial.fi ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: Help! a very simple question..
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In reply to this post by Yue Li-2
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 <[hidden email]> wrote: Hi, 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.
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.......
-- Manish Rana Software Engg. Handset Technology Solution, Sasken Comm. Tech. Bangalore,India ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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Hi Kalle and Manish,
Thank you very much! The pipeline works now :) For the problem of gst-launch filesrc location=mpeg2.mpg ! mpegdemux ! fakesink I found gst-launch filesrc location=mpeg2.mpg ! mpegdemux name=demux demux.video_00 ! fakesink works well. It seems that pad name is required to run mpegdemux. Maybe because it comes from gst-plugin-ugly. On Wed, Feb 27, 2008 at 4:17 PM, Manish Rana <[hidden email]> wrote: > 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 <[hidden email]> 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 > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by: Microsoft > > Defy all challenges. Microsoft(R) Visual Studio 2008. > > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > > _______________________________________________ > > gstreamer-devel mailing list > > [hidden email] > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > > > > > -- > Manish Rana > Software Engg. > Handset Technology Solution, > Sasken Comm. Tech. > Bangalore,India ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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