translating command to code for playing an avi
Rossana Guerra
guerra.rossana at gmail.com
Tue Jan 3 10:21:14 PST 2012
I need to point out that using the gstparse it works. It fails when I try
to create the pipeline by myself.
thanks
2012/1/3 Rossana Guerra <guerra.rossana at gmail.com>
> 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;
>> > }
>>
>> > _______________________________________________
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>> > gstreamer-devel at lists.freedesktop.org
>> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
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>>
>
>
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