Play avi-file

[Mo Cheng]

I have a issue about this example
When I set the state as PLAYING, in which moment the element 's state will
be changed?
Because the video sink just the first frame and stop it.
How can I make it run continuility?
I have already set the state of the pipeline , but it still doesn't work
can some one give me some hints?

On Wed, May 4, 2011 at 12:23 AM, sudarshan bisht
<bisht.sudarshan at gmail.com>wrote:

> 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
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
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