Getting pad capabilities from PIPELINE.
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Getting pad capabilities from PIPELINE.
 
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Hi All,
I want to the get the negotiated caps of a pad, to find the resolution (width and height) and frame-rate of the video. My pipeline looks like
filesrc->mpegtsdemux->decodebin->ffmpegcolorspace->videoscale->xvimagesink. In this pipeline I am scaling my video to 1280x720 resolution from 704x480 When I get the "src" or "sink" pad of ffmpegcolorspace and print the caps from that, the width and height are returned as 1280x720 and not the original one 704x480.
Can someone please tell me where am I going wrong. Thanks, Ashwini Kumar
_______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Getting pad capabilities from PIPELINE.
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I don't understand the problem as you described it.
Have you tired: gst-launch -v --gst-plugin-spew
In your psuedo pipeline, the scaling is last, so the video will still be 704x480 until after videoscale. But it's my understanding you needs caps at the output of video scale to tell it to upscale. If you provide that it will probably do what you want. Mike Mitchell On Thu, Oct 6, 2011 at 9:33 PM, Ashwini Sharma <[hidden email]> wrote: Hi All, _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Getting pad capabilities from PIPELINE.
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My aim is to get the original video size. Thats why I get the caps at ffmpegcsp. But I get the size 1280x720 which should not be the case until after videoscale.
My doubt is why i am getting the size 1280x720 at ffmpegcsp, which is placed before the videsocale.
Any reason to that? -Ashwini
On Fri, Oct 7, 2011 at 1:57 PM, Mike Mitchell <[hidden email]> wrote: I don't understand the problem as you described it. _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Getting pad capabilities from PIPELINE.
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Perhaps because unless the state playing already, videorate will not have decided what scale to negotiate yet. Why do you need to know the caps that are negotiated automatically ?
Mike Mitchell On Fri, Oct 7, 2011 at 1:57 AM, Ashwini Sharma <[hidden email]> wrote: My aim is to get the original video size. Thats why I get the caps at ffmpegcsp. But I get the size 1280x720 which should not be the case until after videoscale. _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Getting pad capabilities from PIPELINE.
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Its for some other requirement of my app where in I need to display the resolution and framerate.
On Fri, Oct 7, 2011 at 3:02 PM, Mike Mitchell <[hidden email]> wrote: Perhaps because unless the state playing already, videorate will not have decided what scale to negotiate yet. Why do you need to know the caps that are negotiated automatically ? _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Getting pad capabilities from PIPELINE.
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Were you able to get this to work?
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Re: Getting pad capabilities from PIPELINE.
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In reply to this post by ak.ashwini
On Fri, 2011-10-07 at 14:27 +0530, Ashwini Sharma wrote:
> My aim is to get the original video size. Thats why I get the caps at > ffmpegcsp. But I get the size 1280x720 which should not be the case > until after videoscale. > > > My doubt is why i am getting the size 1280x720 at ffmpegcsp, which is > placed before the videsocale. > > > Any reason to that? Not sure I understand the problem. Could you provide us with the output of: gst-launch -v filesrc .... ? Cheers -Tim _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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