translating command to code for playing an avi
Rossana Guerra
guerra.rossana at gmail.com
Tue Jan 3 10:19:13 PST 2012
Yes I did it, sorry I forgot to mention. But I want to create de pipeline
to customize it.
Any suggestion of what I am doing wrong in the code?. "caps are
incompatible" it seems to appear in the link of queue (which streams video)
and the decodebin.
Thanks
El 3 de enero de 2012 08:23, Víctor M. Jáquez L. <vjaquez at igalia.com>escribió:
> On Tue, Jan 03, 2012 at 04:21:32AM -0200, Rossana Guerra wrote:
> > Hi, I try to play an avi, I know there's playbin2 option, but I want to
> > gain more control and understand some issues as well.
> >
> > I can play an avi from console with this command.
> > gst-launch filesrc location=/home/rossana/video11.avi ! avidemux
> > name=demux demux.audio_00 ! decodebin ! queue ! audioconvert !
> > audioresample ! autoaudiosink demux.video_00 ! decodebin ! queue !
> > ffmpegcolorspace ! videoscale ! autovideosink"
> >
> > I tempted to translate into C/C++ code, but I got errors "caps
> incompatible"
>
> I guess you could use gst_parse_lunch
>
>
> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstParse.html#gst-parse-launch
>
> vmjl
>
> >
> > Thanks
> >
> > Rossana
> >
> >
> > void on_pad_added (GstElement *element, GstPad *pad, GstElement *data)
> > {
> > g_debug ("Signal: pad-added");
> > 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);
> >
> > cout << "enlazando enlazara pads" << endl << endl;
> > 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");
> > GstPad *targetsink = gst_element_get_pad (data, "sink");
> > cout << "enlazando cola de video" << endl << endl;
> > g_assert (targetsink != NULL);
> > gst_pad_link (pad, targetsink);
> > gst_object_unref (targetsink);
> > }
> >
> > if (g_strrstr (gst_structure_get_name (str), "audio")) {
> > g_debug ("Linking audio pad to dec_ad");
> > // Link it actually
> > //GstPad *targetsink = gst_element_get_pad (decad,
> "sink");
> > GstPad *targetsink = gst_element_get_pad (data, "sink");
> > cout << "enlazando cola de audio" << endl << endl;
> > g_assert (targetsink != NULL);
> > gst_pad_link (pad, targetsink);
> > gst_object_unref (targetsink);
> > }
> >
> > gst_caps_unref (caps);
> > }
> >
> >
> >
> > 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 != 1) {
> > 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 ("decodebin2", "decvd");
> > decad = gst_element_factory_make ("decodebin2", "decad");
> > aconvert = gst_element_factory_make ("audioconvert", "aconvert");
> > asample = gst_element_factory_make ("audioresample", "asample");
> > vdsink = gst_element_factory_make ("autovideosink", "video-sink");
> > vdqueue = gst_element_factory_make ("queue", "video-queue");
> > adqueue = gst_element_factory_make ("queue", "audio-queue");
> > adsink = gst_element_factory_make ("autoaudiosink", "audio-sink");
> > color = gst_element_factory_make("ffmpegcolorspace","color");
> > vscale = gst_element_factory_make("videoscale","vscale");
> >
> > if (!pipeline || !source || !demuxer || !decvd || !decad || !vdsink ||
> > !vdqueue || !adqueue || !adsink) {
> > 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",
> "/home/videos/video11.avi",
> > 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);
> >
> > /* we add all elements into the pipeline */
> > /* file-source | ogg-demuxer | vorbis-decoder | converter |
> alsa-output */
> > //GstElement *clk = gst_element_factory_make("clockoverlay","clk");
> >
> >
> > gst_bin_add_many (GST_BIN (pipeline),source, demuxer, decvd, decad,
> > aconvert, vscale,asample,color,adqueue, vdqueue, vdsink, adsink, NULL);
> >
> >
> > /* we link the elements together */
> > /* file-source -> demuxer ~> {video-decoder -> video-output} ~>
> > {audio-decoder -> alsa-output} */
> > gst_element_link (source, demuxer);
> >
> >
> > GstPad *targetsrc = gst_element_get_pad(demuxer, "video_%02");
> >
> > GstPad *targetsrc2 = gst_element_get_pad(demuxer, "audio_%02");
> >
> >
> > GstPad *padV = gst_element_get_static_pad(decvd,"sink");
> > GstPad *padA = gst_element_get_static_pad(decad,"sink");
> >
> >
> > gst_pad_link (targetsrc,padV);
> > gst_object_unref (targetsrc);
> >
> >
> > g_signal_connect (decvd, "pad-added", G_CALLBACK (on_pad_added),
> vdqueue);
> > cout << "decvd - vdqueue" << endl << endl;
> > gst_element_link (vdqueue,color);
> > gst_element_link (color,vscale);
> > gst_element_link (vscale,vdsink);
> >
> > gst_pad_link (targetsrc2,padA);
> > gst_object_unref (targetsrc2);
> > g_signal_connect (decad, "pad-added", G_CALLBACK (on_pad_added),
> adqueue);
> > cout << "decad - adqueue" << endl << endl;
> > gst_element_link (adqueue, aconvert);
> > gst_element_link (aconvert, asample);
> > gst_element_link (asample, adsink);
> >
> >
> >
> > /* Set the pipeline to "playing" state*/
> > g_print ("Playing: %s\n", argv[1]);
> > gst_element_set_state (pipeline, GST_STATE_PLAYING);
> >
> > GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(pipeline),
> > GST_DEBUG_GRAPH_SHOW_ALL,"playerdec1");
> >
> >
> > g_main_loop_run (loop);
> >
> >
> > /* Out of the main loop, clean up nicely */
> > gst_element_set_state (pipeline, GST_STATE_NULL);
> > gst_object_unref (GST_OBJECT (pipeline));
> > //g_print ("Deleting pipeline\n");
> >
> >
> > return 0;
> > }
>
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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