How to get metadata from videofile?

[Hippi90]

Hello! I am trying to learn this framework by tutorial on official site and i need some help. How can i retrieve metadata from videofile, like resolution, codec, bitrate etc.? If i understand right, i need to create such pipeline: filesrc->demuxer->fakesink, add "pad-added" signal handler to demuxer, link new pads with fakesink, get list of capabilities from them, and then i can get metadata from this caps, right? In tutorial to get properties from caps such code is used:
 
str = gst_caps_get_structure (caps, 0);
  if (!gst_structure_get_int (str, "width", &width) ||
      !gst_structure_get_int (str, "height", &height)) {
    g_print ("No width/height available\n");
    return;
  }
 
  g_print ("The video size of this set of capabilities is %dx%d\n",
           width, height);
 
Where can i find a list of properties of caps? And how can i determine which cap is audio or video?

[Stefan Sauer]

On 10/02/2011 12:58 AM, Hippi90 wrote:
> Hello! I am trying to learn this framework by tutorial on official site and i
> need some help. How can i retrieve metadata from videofile, like resolution,
> codec, bitrate etc.?
Use the GstDiscoverer API. Try via gst-discoverer-0.10 <uri> on the
commandline and look at the tools source code to see how to use it.

Stefan

> If i understand right, i need to create such pipeline:
> filesrc->demuxer->fakesink, add "pad-added" signal handler to demuxer, link
> new pads with fakesink, get list of capabilities from them, and then i can
> get metadata from this caps, right? In tutorial to get properties from caps
> such code is used:
>  
> str = gst_caps_get_structure (caps, 0);
>   if (!gst_structure_get_int (str, "width", &width) ||
>       !gst_structure_get_int (str, "height", &height)) {
>     g_print ("No width/height available\n");
>     return;
>   }
>  
>   g_print ("The video size of this set of capabilities is %dx%d\n",
>            width, height);
>  
> Where can i find a list of properties of caps? And how can i determine which
> cap is audio or video?
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/How-to-get-metadata-from-videofile-tp3863933p3863933.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
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[Hippi90]

Thank you for your piece of advice, but i have problem with building an application with GstDiscoverer. My OS is Fedora 15, i try to compile:  gcc -o gst-discoverer gst-discoverer.c `pkg-config --libs --cflags gstreamer-0.10`.  And i receive "undefined reference" for all GstDiscoverer functions as a result. gstreamer-devel and gstreamer-plugins-base-devel packages are installed. What did i forget?

[Stefan Sauer]

On 10/05/2011 01:43 PM, Hippi90 wrote:
> Thank you for your piece of advice, but i have problem with building an
> application with GstDiscoverer. My OS is Fedora 15, i try to compile:  gcc
> -o gst-discoverer gst-discoverer.c `pkg-config --libs --cflags
> gstreamer-0.10`.  And i receive "undefined reference" for all GstDiscoverer
> functions as a result. gstreamer-devel and gstreamer-plugins-base-devel
> packages are installed. What did i forget?
pkg-config --list-all | grep gstreamer
shows all gst devel modules

gcc -o gst-discoverer gst-discoverer.c `pkg-config --libs --cflags
gstreamer-0.10 gstreamer-pbutils-0.10`

should work.

Stefan
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/How-to-get-metadata-from-videofile-tp3863933p3874175.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[hcpwll]

At 2011-10-02 06:58:18,Hippi90 <[hidden email]> wrote:
>Hello! I am trying to learn this framework by tutorial on official site and i
>need some help. How can i retrieve metadata from videofile, like resolution,
>codec, bitrate etc.? If i understand right, i need to create such pipeline:
>filesrc->demuxer->fakesink, add "pad-added" signal handler to demuxer, link
>new pads with fakesink, get list of capabilities from them, and then i can
>get metadata from this caps, right? In tutorial to get  ;properties from caps
>such code is used:

     use the gst-inspect-0.10 to show the caps.

     You could use the gst_caps_to_string api to print the caps in the "pad-added" signal handler.

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