Play avi-file

[sudarshan bisht]

You forgot to add vcolorspace to the bin that why you are getting those
warnings.

On Mon, May 2, 2011 at 7:56 PM, "Andreas Büttner" <Andreas.Buettner87 at web.de
> wrote:

>
> Hi,
>
> I know the topic was already discussed, but I always receive a mistake by
> using the following code(its nearly the code from a member here in the
> forum):
>
> ------------------code------------------
> #include <gst/gst.h>
> #include <glib.h>
> #include <string.h>
>
> static GstElement *source, *demuxer, *vdqueue, *vdsink, *decvd,
> *vcolorspace;
>
> void on_pad_added (GstElement *element, GstPad *pad)
> {
>
>    gchar *name;
>    name = gst_pad_get_name (pad);
>    g_debug ("A new pad %s was created\n", name);
>
>    GstCaps *caps;
>    GstStructure *str;
>
>    caps = gst_pad_get_caps (pad);
>    g_assert (caps != NULL);
>    str = gst_caps_get_structure (caps, 0);
>    g_assert (str != NULL);
>
>
>    if (g_strrstr (gst_structure_get_name (str), "video")) {
>        g_debug ("Linking video pad to dec_vd");
>        // Link it actually
>        GstPad *targetsink = gst_element_get_pad (decvd, "sink");
>        g_assert (targetsink != NULL);
>        gst_pad_link (pad, targetsink);
>        gst_object_unref (targetsink);
>    }
>
>    gst_caps_unref (caps);
>
> }
>
> static gboolean
> bus_call (GstBus *bus,
>        GstMessage *msg,
>        gpointer data)
> {
>    GMainLoop *loop = (GMainLoop *) data;
>
>    switch (GST_MESSAGE_TYPE (msg)) {
>
>    case GST_MESSAGE_EOS:
>        g_print ("End of stream\n");
>        g_main_loop_quit (loop);
>        break;
>
>    case GST_MESSAGE_ERROR: {
>        gchar *debug;
>        GError *error;
>
>        gst_message_parse_error (msg, &error, &debug);
>
>        g_printerr ("Error: %s (%s) \n", error->message, debug);
>        g_free (debug);
>        g_error_free (error);
>
>        g_main_loop_quit (loop);
>        break;
>    }
>    default:
>        break;
>    }
>
>    return TRUE;
> }
>
> int
> main (int argc,
>        char *argv[])
> {
>    GMainLoop *loop;
>
>    GstElement *pipeline;
>    GstBus *bus;
>
>    /* Initialisation */
>    gst_init (&argc, &argv);
>
>    loop = g_main_loop_new (NULL, FALSE);
>
>
>    /* Check input arguments */
>    if (argc != 2) {
>        g_printerr ("Usage: %s <AVI filename>\n", argv[0]);
>        return -1;
>    }
>
>
>    /* Create gstreamer elements */
>    pipeline = gst_pipeline_new ("media-player");
>    source = gst_element_factory_make ("filesrc", "file-source");
>    demuxer = gst_element_factory_make ("avidemux", "avi-demuxer");
>    decvd = gst_element_factory_make ("decodebin", "video-decoder");
>    vcolorspace = gst_element_factory_make ("ffmpegcolorspace",
> "color-space");
>
>    vdsink = gst_element_factory_make ("autovideosink", "video-sink");
>    vdqueue = gst_element_factory_make ("queue", "video-queue");
>
>
>    if (!pipeline || !source || !demuxer || !decvd || !vdsink
>            || !vdqueue) {
>        g_printerr ("One element could not be created. Exiting.\n");
>        return -1;
>    }
>
>    /* Set up the pipeline */
>
>    /* we set the input filename to the source element */
>    g_object_set (G_OBJECT (source), "location", argv[1], NULL);
>
>    /* we add a message handler */
>    bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
>    gst_bus_add_watch (bus, bus_call, loop);
>    gst_object_unref (bus);
>
>    gst_bin_add_many (GST_BIN (pipeline), source, demuxer, decvd, vdqueue,
> vdsink, NULL);
>
>    gst_element_link (source, demuxer);
>    gst_element_link (demuxer,vdqueue);
>    gst_element_link (vdqueue, decvd);
>    gst_element_link (decvd, vcolorspace);
>    gst_element_link (vcolorspace, vdsink);
>
>    g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added),
> decvd);
>    //g_signal_connect (decvd, "pad-added", G_CALLBACK (on_pad_added),
> NULL);
>
>    /* Set the pipeline to "playing" state*/
>    g_print ("Now playing: %s\n", argv[1]);
>    gst_element_set_state (pipeline, GST_STATE_PLAYING);
>
>    /* Iterate */
>    g_print ("Running...\n");
>    g_main_loop_run (loop);
>
>    /* Out of the main loop, clean up nicely */
>    g_print ("Returned, stopping playback\n");
>    gst_element_set_state (pipeline, GST_STATE_NULL);
>
>    g_print ("Deleting pipeline\n");
>    gst_object_unref (GST_OBJECT (pipeline));
>
>    return 0;
> }
>
> ------------------code-end--------------
>
> I get the following mistake:
>
> (play-avi2:4453): GStreamer-WARNING **: Trying to connect elements that
> don't share a common ancestor: color-space and video-sink
>
> (play-avi2:4453): GStreamer-WARNING **: Trying to connect elements that
> don't share a common ancestor: color-space and video-sink
> Now playing: avi-test2.avi
> ** (play-avi2:4453): DEBUG: A new pad video_00 was created
>
> ** (play-avi2:4453): DEBUG: Linking video pad to dec_vd
> Running...
> Error: Interner Datenstromfehler. (gstavidemux.c(5134): gst_avi_demux_loop
> (): /GstPipeline:media-player/GstAviDemux:avi-demuxer:
> streaming stopped, reason not-linked)
> Returned, stopping playback
> Deleting pipeline
>
>
> I also tried the command-line tool:  gst-launch filesrc
> location=avi-test2.avi ! avidemux name=demux demux.video_00 ! queue !
> decodebin ! ffmpegcolorspace ! videoscale ! autovideosink
>
> On this way it is working, but with the code it is not possible to play the
> avi-file. I think the mistake is at the dynamic src-pad from the
> avidemuxer,
> but I have no idea how to fix it.
>
>
> Best regards, Andreas
>
>
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>



-- 
Regards,

Sudarshan Bisht
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